Bibliografías temáticas / Double Perovskite Manganites

Literatura académica sobre el tema "Double Perovskite Manganites"

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Publicado: 6 de septiembre de 2023

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Artículos de revistas sobre el tema "Double Perovskite Manganites"

1

GU, R. Y. y Z. D. WANG. "SPIN AND ORBITAL PHYSICS IN MANGANITES". International Journal of Modern Physics B 15, n.º 19n20 (10 de agosto de 2001): 2727–45. http://dx.doi.org/10.1142/s0217979201006501.

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The spin and orbital physics in perovskite manganites is briefly reviewed. Perovskite manganites are well known as the materials exhibiting colossal magnetoresistance (CMR), whose mechanism is based on the double exchange (DE) interaction, in which the electron hopping is connected with the spin configurations of the manganite ions. Recent intensive studies have shown that this DE framework must be subjected to the strong correlation between orbital degenerate electrons. On one hand, the orbital degeneracy itself leads to an anisotropic DE hopping being different from the conventional DE, which in turn may result in the anisotropy of the magnetic structure, such as the A-type or the C-type antiferromagnetism. On the other hand, the electronic correlation between these degenerate electrons plays an important role in determining the phases of the system. The correlation can come from both the on-site Coulomb interaction and the Jahn–Teller coupling between the lattice distortion and the electrons. The interplay of the DE mechanism and the strong electronic correlation leads to various magnetic, orbital and/or charge ordering as well as the phase separation.
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2

Zhou, J. S. y J. B. Goodenough. "Phonon-Assisted Double Exchange in Perovskite Manganites". Physical Review Letters 80, n.º 12 (23 de marzo de 1998): 2665–68. http://dx.doi.org/10.1103/physrevlett.80.2665.

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3

Solana-Madruga, Elena, Clemens Ritter, Olivier Mentré, J. Paul Attfield y Ángel M. Arévalo-López. "Giant coercivity and spin clusters in high pressure polymorphs of Mn2LiReO6." Journal of Materials Chemistry C 10, n.º 11 (2022): 4336–41. http://dx.doi.org/10.1039/d2tc00451h.

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New high-pressure ordered-ilmenite and double-perovskite polymorphs of Mn2LiReO6 are unprecedented A-site manganites with B/B′ +/7+ oxidation states. They show cluster spin-cluster-glass behaviour and giant coercivity without spin–orbit-coupling.
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4

Bao, Wei, J. D. Axe, C. H. Chen, S. W. Cheong, P. Schiffer y M. Roy. "From double exchange to superexchange in charge-ordering perovskite manganites". Physica B: Condensed Matter 241-243 (diciembre de 1997): 418–20. http://dx.doi.org/10.1016/s0921-4526(97)00607-8.

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5

Wang, Zhiming, Qingyu Xu, Gang Ni y He Zhang. "Magnetic entropy change in perovskite manganites La0.6Pr0.1Pb0.3MnO3 with double metal–insulator peaks". Physica B: Condensed Matter 406, n.º 23 (diciembre de 2011): 4333–37. http://dx.doi.org/10.1016/j.physb.2011.08.015.

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6

Craus, M. L., N. Cornei y T. L. To. "Low-Doped La0.54Ho0.11Sr0.35Mn1-XVxO3 Manganites: Vanadium Influence on Transport Phenomena and Magnetic Properties". Solid State Phenomena 190 (junio de 2012): 85–88. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.85.

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Transport phenomena in manganites (ABO3), and indirectly the transition temperature from metallic to insulator state (TMI), can be controlled by hole doping and the average ionic size at A positions (). In agreement with Zener theory, the strength of double exchange is determined by the Mn-O length (dMnO) and Mn-O-Mn angles () of the Mn-O-Mn bonds. We will investigate the influence of substitution of Mn with V on the crystalline structure and transport characteristics in La0.54Ho0.11Sr0.35Mn1-xVxO3 manganites. The samples were prepared by sol-gel method to improve the purity and homogeneity of the samples. By XRD it was established that the samples contain only ABO3 perovskite phases, except the samples with x0.1. The resistance of the samples vs temperature was determined by four probes method. The specific magnetization was obtained by using a Foner type magnetometer, working at 1.4 T, between 77 and 400 K.
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7

Dudric, Roxana, Gabriela Souca y Firuța Goga. "Magnetocaloric Effect in LA1.2R0.2CA1.6MN2O7 (R=Tb, Dy, Ho, Er) Perovskites Synthesized by Sol-Gel Method". Studia Universitatis Babeș-Bolyai Physica 67, n.º 1-2 (30 de diciembre de 2022): 9–16. http://dx.doi.org/10.24193/subbphys.2022.01.

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"Nanocrystalline double layered La1.2R0.2Ca1.6Mn2O7 manganites with R = Tb, Dy, Ho, and Er were synthesized by sol-gel method. The XRD measurements indicate that all samples are single phase with a Sr3Ti2O7-type tetragonal (I4/mmm) structure and mean crystallite sizes between 22 nm and 27 nm. The magnetic measurements evidence a spin-glass like behavior at low temperatures for all samples, which may be due to frustration of random competing ferromagnetic and antiferromagnetic interactions together with the anisotropy originating from the layered structure. A moderate magnetocaloric effect was found for all samples, with the maximum entropy change located at temperatures near the magnetic transition ones, but high RCP(S) values were obtained due to the broadened magnetic entropy curves. Keywords: nanoparticles, double layered perovskite, magnetocaloric effect. "
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8

VARSHNEY, DINESH y N. KAURAV. "LOW TEMPERATURE SPECIFIC HEAT ANALYSIS OF LaMnO3+δ MANGANITES". International Journal of Modern Physics B 20, n.º 28 (10 de noviembre de 2006): 4785–97. http://dx.doi.org/10.1142/s021797920603559x.

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We report a theoretical analysis for the experimental specific heat C(T) data of the perovskite manganites LaMnO 3+δ, with δ=0.11, 0.15 and 0.26, in the temperature domain 4≤T≤10 K . Calculations of C(T) have been made within the two-component scheme: one is the Fermionic and the other is Bosonic (phonon or magnon) contribution. Lattice specific heat is well estimated from the Debye temperature for lanthanum manganites with different δ obtained following an overlap repulsive potential. Fermionic component as the electronic specific heat coefficient is deduced using the band structure calculations. Later on, following double exchange mechanism the role of magnons is assessed toward specific heat and is found that at low temperatures, specific heat shows almost T3/2 dependence on the temperature. We note that the lattice specific heat is smaller for δ=0.11 when compared with that of magnon specific heat below 6 K, while the lattice contribution is larger with the magnon contribution for δ=0.15 and 0.26. It is further noticed that in the ferromagnetic phase, deduced electronic specific heat is smaller in comparison with reported large electronic term in low temperature domain. The present investigations allow us to stress that electron correlations are essential to enhanced density of state over simple Fermi liquid approximation in pure LaMnO 3+δ (δ=0.11, 0.15 and 0.26). These findings express that the large Coulomb interaction U suppresses the double occupancies of eg electrons and enhanced electronic specific heat, while there is a decrease of T3/2-term with δ from 0.26 to 0.11. The present numerical analysis of specific heat shows similar results as those revealed from experiments.
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9

Lu, Chengliang, Menghao Wu, Lin Lin y Jun-Ming Liu. "Single-phase multiferroics: new materials, phenomena, and physics". National Science Review 6, n.º 4 (1 de julio de 2019): 653–68. http://dx.doi.org/10.1093/nsr/nwz091.

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Abstract Multiferroics, where multiple ferroic orders coexist and are intimately coupled, promise novel applications in conceptually new devices on one hand, and on the other hand provide fascinating physics that is distinctly different from the physics of high-TC superconductors and colossal magnetoresistance manganites. In this mini-review, we highlight the recent progress of single-phase multiferroics in the exploration of new materials, efficient roadmaps for functionality enhancement, new phenomena beyond magnetoelectric coupling, and underlying novel physics. In the meantime, a slightly more detailed description is given of several multiferroics with ferrimagnetic orders and double-layered perovskite structure and also of recently emerging 2D multiferroics. Some emergent phenomena such as topological vortex domain structure, non-reciprocal response, and hybrid mechanisms for multiferroicity engineering and magnetoelectric coupling in various types of multiferroics will be briefly reviewed.
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10

Tovstolytkin, A. I., A. N. Pogorilyi y S. M. Kovtun. "Double-peaked character of the temperature dependence of resistance of perovskite manganites for a broadened ferromagnetic transition". Low Temperature Physics 25, n.º 12 (diciembre de 1999): 962–65. http://dx.doi.org/10.1063/1.593848.

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Tesis sobre el tema "Double Perovskite Manganites"

1

Bardelli, Fabrizio. "Etude des propriétés structurelles locales des matériaux magnétorésistifs". Phd thesis, 2006. http://tel.archives-ouvertes.fr/tel-00139843.

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L'objectif de cet étude est de donner une caractérisation complète
de la structure locale de deux classes de composés : les manganites
de lanthane droguées avec du sodium et les doubles perovskites de
ferro-molybdène droguées avec du tungstène. Les deux classes se
comportent, en général comme de conducteurs dans leur phase
ferromagnétique et, suivant variations de température ou de dopage,
ils subissent une transition métal-isolant à laquelle il faut
associer une transition
ferromagnétique-paramagnétique(antiferromagnétique). En effet, il
est tout à fait accepté que aussi bien dans les manganites, que dans
les perovskites doubles, les propriétés de transport sont
influencées d'une façon importante par la structure locale (longueur
et angle de liaison) autour des sites clés occupés par des ions
magnétiques. Pour cette raison la spectroscopie d'absorption de
rayon X, en étant sensible à l'ordre locale autour de l'atome
absorbeur, constitue la technique la plus adaptée pour l'étude de
ces composés. La structure locale de film fins de manganite droguées
avec du sodium a été étudiée en fonction de l'épaisseur des film.
Des échantillons de poudre de perovskites double droguées avec
tungstène ont été étudiées pour en caractériser la structure locale
en fonction du dopage et pour chercher de comprendre la nature de la
transition métal-isolant. Il a été nécessaire de développer un
détecteur d'électrons. La réalisation de cet instrument s'est révélé
un défi du point de vue technique et il a demandé une quantité de
travail aussi bien sur la plan pratique que théorique. Les mesures
d'absorption de rayon-X ont été effectuées à la ligne de lumière
italienne pour la diffraction et l'absorption (GILDA-BM8) à
l'Installation Européenne de Rayonnement de Synchrotron (ESRF) de
Grenoble (France).
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2

Hühn, Sebastian. "Kationen-Ordnung in ferri/ferromagnetischen perowskitischen Dünnfilmen". Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-0022-6060-B.

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Ein großes Hindernis für die Anwendbarkeit von oxidischen Perowskiten in elektrotechnischen oder spintronischen Applikationen, ist die Größe der spezifischen Temperaturen, bei der die physikalischen Phänomene, wie Ferromagnetismus oder Hochtemperatur-Supraleitung, beobachtet werden können. Die physikalischen Eigenschaften der Perowskite zeigen eine Abhängigkeit von der Ordnung der verschiedenartigen Metallionen in mehrkomponentigen Systemen. Die Abhängigkeit ergibt sich durch den Einfluss der Metallionen auf die Elektronenkonfiguration und elastischen Verspannung innerhalb des Materials. Man spricht in diesem Zusammenhang auch von der Kontrolle der Füllung und der Bandbreite der elektronischen Bänder im Material durch die Wahl der Metallionen. Die Zielsetzung dieser Arbeit ist die Präparation und Charakterisierung von künstlich A-Platz geordneten schmal- und breitbandigen Manganat Dünnfilmen als auch von natürlich B-Platz geordneten ferro-/ferrimagnetischen doppelperowskitischen Dünnfilmen. Für die Präparation der dünnen Schichten wurde die unkonventionelle Metallorganischen Aerosol Deposition (MAD) verwendet. Es konnte gezeigt werden, dass diverse künstlich oder natürlich Kationengeordnete Perowskite mit der MAD Technologie präpariert werden können. Die lagenweise A-Platz Ordnung in Manganaten führt, über die Modulation der Gitterverspannung und der Elektronenbesetzung im eg-Band der Manganionen, zu modifizierten elektronischen und magnetischen Eigenschaften. In schmalbandigen CMR Manganaten wurde die PS und somit der CMR über die Ordnung beeinflusst, während in breitbandigen CMR Manganaten ein Weg aufgezeigt werden konnte, der zu Übergangstemperaturen TC > 370K führen kann. In geordneten, ferromagnetischen Doppelperowskiten wurde der Einfluss und die Anwesenheit von Antiphasen-Grenzen dargelegt. Über die Einführung einer aktiven Valenz-Kontrolle, konnte die Präparation von halbmetallischen, ferrimagnetischen Doppelperowskiten mit der MAD Technologie ermöglicht werden.
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3

Küpper, Karsten. "Electronic and magnetic properties of transition metal compounds: An x-ray spectroscopic study". Doctoral thesis, 2005. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2005071510.

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The aim of the present work was to develop a detailed picture of the electronic and magnetic properties of a number of interesting transition metal compounds. A number of complementary experimental and theoretical techniques have been applied, special emphasis was given to x-ray spectroscopies. The studies led to a number of results, and the following conclusions can be drawn: The influence of the magnetic ground state (high-spin (FeO) vs. low-spin (FeS2)) with respect to the recorded x-ray spectra was investigated. In particular, by performing RXES on the Fe L edge of the two compounds, very different ratios of La / Lβ integrated intensity for excitation energies close to the L2 edge have been observed. This effect has been explained in terms of the magnetic structure of FeO (high spin), which inhibits Coster-Kronig processes. Special attention has been given to the direct investigation of orbital ordering in a three dimensional CMR manganite, namely La7/8Sr1/8MnO3, by means of x-ray linear dichroism (XLD). We obtained, for the first time, rather strong indications that the coherently distorted Jahn-Teller phase in La7/8Sr1/8MnO3 is accompanied by a predominantly cross type (x2-z2) / (y2-z2) orbital ordering. In addition to manganites the double perovskite Sr2FeMoO6 the combined study by means of x-ray spectroscopies, magnetic measurements and theoretical band structure calculations could resolve some points discussed controversially in the literature. Both, paramagnetic measurements as well as core level spectroscopy of the Fe 2p, Fe 3s and the Mo 3d states suggest a mixed iron valence state involving around 30% Fe3+- Mo5+ and 70% Fe2+ - Mo6+ states in highly ordered Sr2FeMoO6. XPS valence band studies reveal that the Fe 3d states are not extremely localized, and we find evidence that charge transfer between Fe 3d and O 2p states plays an essential role.
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Informes sobre el tema "Double Perovskite Manganites"

1

Bao, W., J. D. Axe, C. H. Chen, S. W. Cheong, P. Schiffer y M. Roy. From double exchange to superexchange in charge ordering perovskite manganites. Office of Scientific and Technical Information (OSTI), agosto de 1998. http://dx.doi.org/10.2172/307963.

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