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Journal articles on the topic 'Helimagnetism'

Author: Grafiati

Published: 10 March 2023

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1

Zhang, S. L., R. Chalasani, A. A. Baker, N. J. Steinke, A. I. Figueroa, A. Kohn, G. van der Laan, and T. Hesjedal. "Engineering helimagnetism in MnSi thin films." AIP Advances 6, no. 1 (January 2016): 015217. http://dx.doi.org/10.1063/1.4941316.

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2

Ballou, R., J. Deportes, R. Lemaire, Y. Nakamura, and B. Ouladdiaf. "Helimagnetism in the cubic Laves phase YMn2." Journal of Magnetism and Magnetic Materials 70, no. 1-3 (December 1987): 129–33. http://dx.doi.org/10.1016/0304-8853(87)90379-9.

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3

Theis-Bröhl, Katharina, K. A. Ritley, C. P. Flynn, K. Hamacher, H. Kaiser, and J. J. Rhyne. "Coexisting ferro- and helimagnetism in Dy/Y superlattices." Journal of Applied Physics 81, no. 8 (April 15, 1997): 5375–77. http://dx.doi.org/10.1063/1.364603.

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4

Kousaka, Y., Y. Nakao, J. Kishine, M. Akita, K. Inoue, and J. Akimitsu. "Chiral helimagnetism in T1/3NbS2 (T=Cr and Mn)." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 600, no. 1 (February 2009): 250–53. http://dx.doi.org/10.1016/j.nima.2008.11.040.

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5

Drechsler, S. L., J. Richter, R. Kuzian, J. Málek, N. Tristan, B. Büchner, A. S. Moskvin, et al. "Helimagnetism and weak ferromagnetism in edge-shared chain cuprates." Journal of Magnetism and Magnetic Materials 316, no. 2 (September 2007): 306–12. http://dx.doi.org/10.1016/j.jmmm.2007.03.200.

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6

Goldman, M., J. F. Jacquinot, and C. Urbina. "Rotating transverse nuclear helimagnetism in CaF2. II. Theoretical approximations." Journal of Physics C: Solid State Physics 19, no. 13 (May 10, 1986): 2299–328. http://dx.doi.org/10.1088/0022-3719/19/13/017.

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7

Enderle, M., C. Mukherjee, B. Fåk, R. K. Kremer, J. M. Broto, H. Rosner, S. L. Drechsler, et al. "Quantum helimagnetism of the frustrated spin-½ chain LiCuVO 4." Europhysics Letters (EPL) 70, no. 2 (April 2005): 237–43. http://dx.doi.org/10.1209/epl/i2004-10484-x.

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8

Silva, M. Salgueiro da, J. M. Moreira, M. M. Pereira de Azevedo, J. A. Mendes, C. S. de Abreu, J. B. Sousa, R. J. Melville, and S. B. Palmer. "Helimagnetism and field-induced phases in random Gd64Sc36single crystals." Journal of Physics: Condensed Matter 11, no. 37 (September 2, 1999): 7115–24. http://dx.doi.org/10.1088/0953-8984/11/37/309.

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9

Melville, R. J., S. B. Palmer, S. Bates, and G. J. McIntyre. "Random field effects and breakup of helimagnetism in Gd60Y60." Journal of Magnetism and Magnetic Materials 116, no. 1-2 (October 1992): 267–72. http://dx.doi.org/10.1016/0304-8853(92)90171-j.

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10

Devyaterikov, D. I., E. A. Kravtsov, V. V. Proglyado, V. D. Zhaketov, and Yu V. Nikitenko. "Study of Helimagnetism in Dy/Ho Superlattice by Neutron Reflectometry." Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques 16, no. 5 (October 2022): 839–42. http://dx.doi.org/10.1134/s1027451022050299.

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11

Drechsler, S.-L., N. Tristan, R. Klingeler, B. Büchner, J. Richter, J. Málek, O. Volkova, et al. "Helimagnetism and weak ferromagnetism in NaCu2O2and related frustrated chain cuprates." Journal of Physics: Condensed Matter 19, no. 14 (March 23, 2007): 145230. http://dx.doi.org/10.1088/0953-8984/19/14/145230.

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12

Uimin, Gennadi, and Alberto Pimpinelli. "Helimagnetism inXYmodels: Domain walls, frustrations, fractional vortices, and phase transitions." Physical Review E 49, no. 2 (February 1, 1994): 1123–35. http://dx.doi.org/10.1103/physreve.49.1123.

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13

Schnelzer, J., R. Montbrun, B. Pilawa, G. Fischer, G. Venturini, and E. Dormann. "Helimagnetism in gallium substituted LuMn6Ge6 studied by nuclear magnetic resonance." European Physical Journal B 58, no. 1 (July 2007): 11–23. http://dx.doi.org/10.1140/epjb/e2007-00204-6.

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14

Kamarád, J., O. Prokhnenko, K. Prokeš, Z. Arnold, and A. V. Andreev. "Pressure induced helimagnetism in Fe-based (Y2Fe17, Lu2Fe17) intermetallic compounds." Journal of Magnetism and Magnetic Materials 310, no. 2 (March 2007): 1801–3. http://dx.doi.org/10.1016/j.jmmm.2006.10.714.

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15

Clark, Judith, Chongin Pak, Huibo Cao, and Michael Shatruk. "Helimagnetism in MnBi2Se4 Driven by Spin-Frustrating Interactions Between Antiferromagnetic Chains." Crystals 11, no. 3 (February 27, 2021): 242. http://dx.doi.org/10.3390/cryst11030242.

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We report the magnetic properties and magnetic structure determination for a linear-chain antiferromagnet, MnBi2Se4. The crystal structure of this material contains chains of edge-sharing MnSe6 octahedra separated by Bi atoms. The magnetic behavior is dominated by intrachain antiferromagnetic (AFM) interactions, as demonstrated by the negative Weiss constant of −74 K obtained by the Curie–Weiss fit of the paramagnetic susceptibility measured along the easy-axis magnetization direction. The relative shift of adjacent chains by one-half of the chain period causes spin frustration due to interchain AFM coupling, which leads to AFM ordering at TN = 15 K. Neutron diffraction studies reveal that the AFM ordered state exhibits an incommensurate helimagnetic structure with the propagation vector k = (0, 0.356, 0). The Mn moments are arranged perpendicular to the chain propagation direction (the crystallographic b axis), and the turn angle around the helix is 128°. The magnetic properties of MnBi2Se4 are discussed in comparison to other linear-chain antiferromagnets based on ternary mixed-metal halides and chalcogenides.

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16

Urbina, C., J. F. Jacquinot, and M. Goldman. "Rotating transverse nuclear helimagnetism in CaF2. I. Prediction and experimental study." Journal of Physics C: Solid State Physics 19, no. 13 (May 10, 1986): 2275–97. http://dx.doi.org/10.1088/0022-3719/19/13/016.

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17

Devyaterikov, D. I., E. A. Kravtsov, V. V. Proglyado, V. D. Zhaketov, and Yu V. Nikitenko. "Investigation of Helimagnetism in Dy and Ho Thin Films by Neutron Reflectometry." Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques 15, no. 3 (May 2021): 542–48. http://dx.doi.org/10.1134/s102745102103023x.

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18

Giebultowicz, T. M., Valerie Nunez, N. Samarth, Hong Luo, and J. K. Furdyna. "Onset of helimagnetism in weakly strained epitaxial FCC antiferromagnet Cd1−xMnxSe (abstract)." Journal of Applied Physics 73, no. 10 (May 15, 1993): 6090. http://dx.doi.org/10.1063/1.353479.

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19

Giebultowicz, T. M., H. Luo, N. Samarth, J. K. Furdyna, Valerie Nunez, J. J. Rhyne, W. Faschinger, G. Springholtz, G. Bauer, and H. Sitter. "Strain-induced helimagnetism, finite thickness effects, and interlayer coupling in magnetic semiconductor multilayers." Physica B: Condensed Matter 198, no. 1-3 (April 1994): 163–68. http://dx.doi.org/10.1016/0921-4526(94)90152-x.

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20

Zhang, Chenhui, Junwei Zhang, Chen Liu, Senfu Zhang, Ye Yuan, Peng Li, Yan Wen, et al. "Chiral Helimagnetism and One‐Dimensional Magnetic Solitons in a Cr‐Intercalated Transition Metal Dichalcogenide." Advanced Materials 33, no. 35 (July 24, 2021): 2101131. http://dx.doi.org/10.1002/adma.202101131.

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21

Ishida, Shigeyuki, Daniel Kagerbauer, Sigrid Holleis, Kazuki Iida, Koji Munakata, Akiko Nakao, Akira Iyo, et al. "Superconductivity-driven ferromagnetism and spin manipulation using vortices in the magnetic superconductor EuRbFe4As4." Proceedings of the National Academy of Sciences 118, no. 37 (September 7, 2021): e2101101118. http://dx.doi.org/10.1073/pnas.2101101118.

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Magnetic superconductors are specific materials exhibiting two antagonistic phenomena, superconductivity and magnetism, whose mutual interaction induces various emergent phenomena, such as the reentrant superconducting transition associated with the suppression of superconductivity around the magnetic transition temperature (Tm), highlighting the impact of magnetism on superconductivity. In this study, we report the experimental observation of the ferromagnetic order induced by superconducting vortices in the high-critical-temperature (high-Tc) magnetic superconductor EuRbFe4As4. Although the ground state of the Eu2+ moments in EuRbFe4As4 is helimagnetism below Tm, neutron diffraction and magnetization experiments show a ferromagnetic hysteresis of the Eu2+ spin alignment. We demonstrate that the direction of the Eu2+ moments is dominated by the distribution of pinned vortices based on the critical state model. Moreover, we demonstrate the manipulation of spin texture by controlling the direction of superconducting vortices, which can help realize spin manipulation devices using magnetic superconductors.

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22

Mitsiuk V.I., Rimskiy G.S., Yanushkevich K.I., Koledov V.V., Mashirov A.V., Val'kov V.I., Golovchan A.V., and Kovalev O.E. "Magnetostructural features of phase transitions in the Mn-=SUB=-1-x-=/SUB=-Co-=SUB=-x-=/SUB=-NiGe system Part 1. Experimental results." Physics of the Solid State 64, no. 14 (2022): 2344. http://dx.doi.org/10.21883/pss.2022.14.54333.153-1.

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Experimental studies of the magnetic and structural properties of solid solutions of the Mn1-xCoxNiGe system in a wide range of Co concentrations (0.05≤ x≤ 0.8), temperatures (5 K≤ x≤600 K) and magnetic fields (0.016 T≤ x≤ 13.5 T) have revealed a number of nontrivial magnetic and magnetocaloric features of this system. The latter include: 1) a change in the nature of magnetic phase transitions from magnetostructural transitions of the 1st order paramagnetism-antiferromagnetism (0.05≤ x≤ 0.15) to isostructural transitions of the 2nd order paramagnetism-ferromagnetism (0.15≤ x≤0.8) with a change in the concentration of Co ; 2) anomalous behavior of low-temperature regions of magnetization in weak magnetic fields; 3) a change in the saturation magnetization and the appearance of irreversible magnetic field-induced transitions at helium temperatures in strong magnetic fields. Keywords: irreversible magnetostructural first-order phase transition, helimagnetism, direct and inverse magnetocaloric effects.

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23

Mitsiuk V.I., Rimskiy G.S., Koledov V.V., Mashirov A.V., Val'kov V.I., Golovchan A.V., and Kovalev O.E. "Magnetostructural features of phase transitions in the Mn-=SUB=-1-x-=/SUB=-Co-=SUB=-x-=/SUB=-NiGe system Part 2. Analysis." Physics of the Solid State 64, no. 14 (2022): 2352. http://dx.doi.org/10.21883/pss.2022.14.54334.153-2.

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Within the framework of the model of interacting parameters of the magnetic and structural orders, taking into account the internal periodic magnetic field orthogonal to the exchange field, we analyzed the features of magnetostructural transitions in the Mn1-xCoxNiGe system. A qualitative description of changes in the nature of magnetic phase transitions from magnetostructural transitions of the 1st order paramagnetism-antiferromagnetism (x=0.05-0.1) to isostructural transitions of the 2nd order paramagnetism-ferromagnetism (x=0.15-0.8) with a change in the concentration of Co is presented. An explanation is given for the onset of irreversible magnetic-field-induced transitions at temperatures on the order of 5 K in strong magnetic fields, accompanied by a change in the saturation magnetization for samples x=0.15-0.8. The low-temperature inverse magnetocaloric effect at liquid helium temperatures is predicted for these samples. Keywords: irreversible magnetostructural first-order phase transition, helimagnetism, direct and inverse magnetocaloric effects.

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24

Ly, Trinh Thi, Jungmin Park, Kyoo Kim, Hyo‐Bin Ahn, Nyun Jong Lee, Kwangsu Kim, Tae‐Eon Park, et al. "Direct Observation of Fe‐Ge Ordering in Fe 5− x GeTe 2 Crystals and Resultant Helimagnetism." Advanced Functional Materials 31, no. 17 (February 19, 2021): 2009758. http://dx.doi.org/10.1002/adfm.202009758.

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25

Sjostrom, J. "An anisotropic band model for helimagnetism and spin-density waves, with application to Cr and MnP." Journal of Physics: Condensed Matter 2, no. 20 (May 21, 1990): 4637–54. http://dx.doi.org/10.1088/0953-8984/2/20/010.

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26

SHIMADA, Takahiro, Junichi OKUNO, and Takayuki KITAMURA. "OS1206 Ab-initio Study of Emergence of Helimagnetism and Its Chiral Selectivity in Single-wall Iron Nanotubes." Proceedings of the Materials and Mechanics Conference 2013 (2013): _OS1206–1_—_OS1206–3_. http://dx.doi.org/10.1299/jsmemm.2013._os1206-1_.

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27

Naumova, L. I., M. A. Milyaev, R. S. Zavornitsyn, T. P. Krinitsina, V. V. Proglyado, and V. V. Ustinov. "Spin valve with a composite dysprosium-based pinned layer as a tool for determining Dy nanolayer helimagnetism." Current Applied Physics 19, no. 11 (November 2019): 1252–58. http://dx.doi.org/10.1016/j.cap.2019.08.012.

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28

Chen, Guangze, Maryam Khosravian, Jose L. Lado, and Aline Ramires. "Designing spin-textured flat bands in twisted graphene multilayers via helimagnet encapsulation." 2D Materials 9, no. 2 (February 2, 2022): 024002. http://dx.doi.org/10.1088/2053-1583/ac4af8.

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Abstract Twisted graphene multilayers provide tunable platforms to engineer flat bands and exploit the associated strongly correlated physics. The two-dimensional nature of these systems makes them suitable for encapsulation by materials that break specific symmetries. In this context, recently discovered two-dimensional helimagnets, such as the multiferroic monolayer NiI2, are specially appealing for breaking time-reversal and inversion symmetries due to their nontrivial spin textures. Here we show that this spin texture can be imprinted on the electronic structure of twisted bilayer graphene by proximity effect. We discuss the dependence of the imprinted spin texture on the wave-vector of the helical structure, and on the strength of the effective local exchange field. Based on these results we discuss the nature of the superconducting instabilities that can take place in helimagnet encapsulated twisted bilayer graphene. Our results put forward helimagnetic encapsulation as a powerful way of designing spin-textured flat band systems, providing a starting point to engineer a new family of correlated moire states.

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29

Shimada, Takahiro, Junichi Okuno, and Takayuki Kitamura. "Chiral Selectivity of Unusual Helimagnetic Transition in Iron Nanotubes: Chirality Makes Quantum Helimagnets." Nano Letters 13, no. 6 (May 31, 2013): 2792–97. http://dx.doi.org/10.1021/nl401047z.

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30

Kousaka, Y., T. Ogura, J. Jiang, K. Mizutani, S. Iwasaki, J. Akimitsu, and Y. Togawa. "An emergence of chiral helimagnetism or ferromagnetism governed by Cr intercalation in a dichalcogenide CrNb₃S₆." APL Materials 10, no. 9 (September 1, 2022): 090704. http://dx.doi.org/10.1063/5.0101351.

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A synthesis of single crystals of chiral dichalcogenides TM3 X6 ( T: 3 d transition metal, M: Nb or Ta, X: S or Se) remains an intriguing issue for the investigation of emergent quantum properties such as chiral helimagnetism. In this study, we investigated a correlation between the quantity of Cr intercalation x and the magnetic property in single crystals of a chromium (Cr) intercalated chiral disulfide Cr xNb3S6 in order to optimize the synthesis condition for the intercalation-controlled single crystals. The magnetic properties, including a magnetic transition temperature Tc, take different values depending on the samples. We systematically grew single crystals of Cr xNb3S6 with x ranged from 0.89 to 1.03 and found that the amount of the Cr intercalation x is an essential factor in controlling the magnetic properties of the grown crystals. The magnetization anomaly, which appears in the temperature dependence as evidence of the formation of chiral magnetic soliton lattice (CSL), was observed only in a narrow region of x from 0.98 to 1.03. The single crystals with x being 0.98 and 0.99 showed the CSL behavior with the highest Tc of 133 K. These results indicate that the small number of defects on the sites for T ions dramatically affects the quality of the single crystals in the synthesis of TM3S6. We also discuss the importance of synthesizing enantiopure single crystals of chiral dichalcogenides in order to observe chiral physical properties unique to chiral compounds such as magneto-chiral effect and chiral-induced spin selectivity.

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31

Okumura, Shun, Takahiro Morimoto, Yasuyuki Kato, and Yukitoshi Motome. "Electrical conductivity in helical and conical magnetic states." Journal of Physics: Conference Series 2164, no. 1 (March 1, 2022): 012068. http://dx.doi.org/10.1088/1742-6596/2164/1/012068.

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Abstract We theoretically study the electrical conductivity in a one-dimensional helimagnet whose spin texture changes from helimagnetic to conical magnetic, and to forced ferromagnetic state while increasing the magnetic field along the helical axis. We find that the conductivity in the helimagnetic state at zero field depends on the electron filling and the coefficient of the spin-charge coupling. We also find that the conductivity in the conical magnetic state changes nonlinearly to the applied field, and the magnetoresistance becomes negative and positive depending on the model parameters.

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32

Stishov, Sergei M., and Alla E. Petrova. "Itinerant helimagnetic compound MnSi." Uspekhi Fizicheskih Nauk 181, no. 11 (2011): 1157. http://dx.doi.org/10.3367/ufnr.0181.201111b.1157.

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33

Diep, H. T. "Critical Properties of Helimagnets." Europhysics Letters (EPL) 7, no. 8 (December 15, 1988): 725–30. http://dx.doi.org/10.1209/0295-5075/7/8/010.

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34

Diep, H. T. "Magnetic transitions in helimagnets." Physical Review B 39, no. 1 (January 1, 1989): 397–404. http://dx.doi.org/10.1103/physrevb.39.397.

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35

Rastelli, E., L. Reatto, and A. Tassi. "Quantum fluctuations in helimagnets." Journal of Physics C: Solid State Physics 18, no. 2 (January 20, 1985): 353–60. http://dx.doi.org/10.1088/0022-3719/18/2/013.

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36

Вальков, В. И., А. В. Головчан, В. В. Коледов, Б. М. Тодрис, and В. И. Митюк. "Скачкообразные процессы магнитного разупорядочения, стимулированные магнитным полем в системах со структурной неустойчивостью." Физика твердого тела 62, no. 5 (2020): 710. http://dx.doi.org/10.21883/ftt.2020.05.49234.05m.

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A theoretical analysis of the features of structural and magnetostructural first-order phase transitions in magnetocaloric helimagnetic alloys of the Mn_{1-x}Cr_{x}NiGe system has been carried out. To describe the observed displacive structural transitions hex(P6_{3}/mmc)<->orth(P_{nma}), we used the local soft mode model in the approximation of a biased harmonic oscillator. In the absence of a magnetic field, the emergence of a helimagnetic order as a structurally induced second-order transition was described in the framework of the Heisenberg model, taking into account the dependence of the exchange integrals on the structural order parameters and elastic strains. In the presence of a magnetic field, it was found that the approximation of the characteristic temperatures for the helimagnetic HM(P_{nma}) and lability temperatures of the hexagonal paramagnetic PM(P6_{3}/mmc) states, due to the influence of the magnetic field, leads to the appearance of previously unexplored peripheral magnetostructural first-order phase transitions with insignificant magnetization jumps that increase with increasing magnetic induction.In this case, as the pressure increases to 4 kbar with constant induction of the magnetic field, the peripheral transitions transform into reversible first-order magnetostructural transitions, and at even higher pressures (10-14 kbar) into full-fledged first-order magnetostructural transitions with magnetization jumps comparable with maximum value of magnetization. Experimental pressure studies of the temperature dependences of magnetization in static magnetic fields with an induction of up to 1 T and a pressure of up to 14 kbar confirm the theoretical results.

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37

Schoenherr, P., J. Müller, L. Köhler, A. Rosch, N. Kanazawa, Y. Tokura, M. Garst, and D. Meier. "Topological domain walls in helimagnets." Nature Physics 14, no. 5 (March 5, 2018): 465–68. http://dx.doi.org/10.1038/s41567-018-0056-5.

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38

Dyadkin, V. A., S. V. Grigoriev, E. V. Moskvin, S. V. Maleyev, D. Menzel, J. Schoenes, and H. Eckerlebe. "Critical scattering in the helimagnets." Physica B: Condensed Matter 404, no. 17 (September 2009): 2520–23. http://dx.doi.org/10.1016/j.physb.2009.06.013.

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39

Harris, A. B., E. Rastelli, and A. Tassi. "Phase locking in Heisenberg helimagnets." Journal of Applied Physics 67, no. 9 (May 1990): 5445–47. http://dx.doi.org/10.1063/1.345838.

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40

Rastelli, E., and A. Tassi. "Quantum gaps in Heisenberg helimagnets." Journal of Magnetism and Magnetic Materials 104-107 (February 1992): 1035–36. http://dx.doi.org/10.1016/0304-8853(92)90477-6.

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41

Kousaka, Yusuke. "Helimagnetic Chirality in Chiral Helimagnetic CsCuCl₃ Probed by Polarized Neutron Diffraction Experiments." hamon 29, no. 1 (February 10, 2019): 12–16. http://dx.doi.org/10.5611/hamon.29.1_12.

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42

Georgii, Robert, and Tobias Weber. "The Helical Magnet MnSi: Skyrmions and Magnons." Quantum Beam Science 3, no. 1 (February 21, 2019): 4. http://dx.doi.org/10.3390/qubs3010004.

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Since the late 1970s, MnSi has played a major role in developing the theory of helical magnets in non-centrosymmetric materials showing the Dzyaloshinsky-Moriya interaction (DMI). With a long helimagnetic pitch of 175 Å as compared to the lattice d-spacing of 4.55 Å, it was ideal for performing neutron studies, especially as large single crystals could be grown. A (B-T)-phase diagram was measured, and in these studies, under the application of a field of about 180 mT perpendicular to the scattering vector Q, a so-called A-phase in the B-T phase diagram was found and first interpreted as a re-orientation of the magnetic helix. After the surprising discovery of the skyrmion lattice in the A-phase in 2009, much interest arose due to the rigidity of the skyrmionic lattice, which is only loosely bound to the crystal lattice, and therefore only relatively small current densities can already induce a motion of this lattice. A very interesting approach to even better understand the complex structures in the phase diagram is to measure and model the spin excitations in MnSi. As the helimagnetic state is characterized by a long pitch of about 175 Å, the associated characteristic excitations form a band structure due to Umklapp scattering and can only be observed at very small Q with energies below 1 meV. Similarly, the excitations of the skyrmion lattice are very soft and low-energetic. We investigated the magnons in MnSi in the whole (B,T)-phase diagram starting in the single-k helimagnetic state by applying a small magnetic field, B = 100 mT. This way, the complexity of the magnon spectrum is significantly reduced, allowing for a detailed comparison of the data with theory, resulting in a full theoretical understanding of the spin system of MnSi in all its different magnetic phases.

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43

Takahashi, Hidefumi, Masaho Onose, Yasuhito Kobayashi, Takahiro Osaka, Soushi Maeda, Atsushi Miyake, Masashi Tokunaga, Hajime Sagayama, Yuichi Yamasaki, and Shintaro Ishiwata. "Possible helimagnetic order in Co⁴⁺-containing perovskites Sr_1−xCa_xCoO₃." APL Materials 10, no. 11 (November 1, 2022): 111116. http://dx.doi.org/10.1063/5.0101473.

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We systematically synthesized perovskite-type oxides Sr1−xCaxCoO3 containing unusually high valence Co4+ ions by a high pressure technique and investigated the effect of systematic lattice change on the magnetic and electronic properties. As the Ca content x exceeds about 0.6, the structure changes from cubic to orthorhombic, which is supported by the first-principles calculations of enthalpy. Upon the orthorhombic distortion, the ground state remains to be apparently ferromagnetic, with a slight drop of the Curie temperature. Importantly, the compounds with x larger than 0.8 show antiferromagnetic behavior, with positive Weiss temperatures and nonlinear magnetization curves at the lowest temperature, implying that the ground state is non-collinear antiferromagnetic or helimagnetic. Considering the incoherent metallic behavior and the suppression of the electronic specific heat at the high x region, the possible emergence of a helimagnetic state in Sr1−xCaxCoO3 is discussed in terms of the bandwidth narrowing and the double-exchange mechanism with the negative charge transfer energy, as well as the spin frustration, owing to the next-nearest neighbor interaction.

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Seo, Kwanyong, Hana Yoon, Seong-Wan Ryu, Sunghun Lee, Younghun Jo, Myung-Hwa Jung, Jinhee Kim, Yang-Kyu Choi, and Bongsoo Kim. "Itinerant Helimagnetic Single-Crystalline MnSi Nanowires." ACS Nano 4, no. 5 (April 28, 2010): 2569–76. http://dx.doi.org/10.1021/nn901653q.

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Tomar, Ruchi, Sonali Kakkar, Saveena Goyal, M. Manolata Devi, Chandan Bera, and S. Chakraverty. "Multiple helimagnetic phases in triclinic CuSeO3." Journal of Magnetism and Magnetic Materials 497 (March 2020): 165945. http://dx.doi.org/10.1016/j.jmmm.2019.165945.

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Häggström, L., A. Gustavsson-Seidel, and H. Fjellvåg. "A Mössbauer Study of Helimagnetic FeAs." Europhysics Letters (EPL) 9, no. 1 (May 1, 1989): 87–92. http://dx.doi.org/10.1209/0295-5075/9/1/016.

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Forsyth, J. B., J. P. Wright, M. D. Marcos, J. P. Attfield, and C. Wilkinson. "Helimagnetic order in ferric arsenate, FeAsO4." Journal of Physics: Condensed Matter 11, no. 6 (January 1, 1999): 1473–78. http://dx.doi.org/10.1088/0953-8984/11/6/011.

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Rastelli, E., and A. Tassi. "Low-temperature thermodynamics of Heisenberg helimagnets." Journal of Physics C: Solid State Physics 19, no. 12 (April 30, 1986): 1993–2005. http://dx.doi.org/10.1088/0022-3719/19/12/013.

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Harris, A. B., E. Rastelli, and A. Tassi. "Novel intermediate phase in Heisenberg helimagnets." Solid State Communications 75, no. 1 (July 1990): 35–38. http://dx.doi.org/10.1016/0038-1098(90)90153-3.

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Cinti, Fabio, Alessandro Cuccoli, and Angelo Rettori. "Magnetic phases in ultrathin helimagnetic holmium films." Journal of Applied Physics 105, no. 7 (April 2009): 07E117. http://dx.doi.org/10.1063/1.3068482.

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