Thèses sur le sujet « Competing phases »
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Sahebsara, Peyman. « Competing phases in strongly correlated electron systems with frustration ». Thèse, Université de Sherbrooke, 2008. http://savoirs.usherbrooke.ca/handle/11143/5104.
Texte intégralFarias, Carlene Paula Silva de. « Competing orders in Uru2Si2 : from ordered magnetism to spin liquid phases ». PROGRAMA DE P?S-GRADUA??O EM F?SICA, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/23653.
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The main objective of this thesis is to investigate the competing ordered phases in the metallic heavy fermion compound URu2Si2, which displays a bodycentered tetragonal lattice. We first provide a study case of the competition between antiferromagnetic (AF) and spin liquid phases. The antiferromagnetic state is study with spin-wave theory. Whereas the spin liquid analysis has been carried out in an algebraic spin liquid representation. In the second part, we describe an effective theory for Raman scattering experiments at these particular phases. We provide insight about the hidden order phase displayed by the heavy fermion compound URu2Si2.
L?objectif central de cette th?se est d??tudier des phases ordonn?es en comp?tition dans des mat?riaux magn?tiques pr?sentant une structure cristalline t?tragonale centr?e. Ce travail est divis? en deux parties principales. Dans la premi?re, nous pr?sentons les r?sultats de notre ?tude de la comp?tition entre des ?tats ordonn?s antiferromagn?tiques et des phases liquides de spin. Nous montrons comment ces derni?res peuvent ?tre stabilis?es par la frustration g?om?trique et par une g?n?ralisation de la sym?trie de spin au groupe SU(n). Les ?tats antiferromagn?tiques sont d?crits par une th?orie d?onde de spin et l?analyse de liquide de spin est effectu?e par une repr?sentation fermionique des op?rateurs de spin. Dans la deuxi?me partie, nous d?crivons une th?orie effective pour d?rcrire des exp?riences de diffusion Raman. Nous fournissons un aper?u de la phase d?ordre cach? affich?e par le compos? de fermions lourds URu2Si2.
Silva, de Farias Carlene Paula. « Competing Orders in URu2Si2 : from ordered magnetism to spin liquid phases ». Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0569/document.
Texte intégralThe main objective of this thesis is to investigate the competing ordered phases in the metallic heavy fermion compound URu2Si2, which displays a body-centered tetragonallattice. We first provide a study case of the competition between antiferromagnetic(AF) and spin liquid phases. The antiferromagnetic state is study with spin-wave theory. Whereas the spin liquid analysis has been carried out in an algebraic spin liquid representation.In the second part, we describe an effective theory for Raman scattering experiments at these particular phases. We provide insight about the hidden order phase displayed by the heavy fermion compound URu2Si2
Coslovich, Giacomo. « Disclosing the ultrafast dynamics of competing phases in high - temperature superconductors by time - resolved optical spectroscopy ». Doctoral thesis, Università degli studi di Trieste, 2011. http://hdl.handle.net/10077/4511.
Texte intégralUnderstanding the interplay between the phases present in a high-temperature superconductor (superconducting, pseudogap, strange metal and Fermi-liquid-like) is the key-concept for shining light on the nature of the superconductivity mechanisms in copper-oxide based superconductors. Here, I set the bases for addressing this physics by developing an approach based on ultrafast time-resolved optical spectroscopy in the infrared and visible spectral regions. The experiments performed disclose the real-time evolution of the optical properties while the system is suddenly brought out-of-equilibrium by an ultrashort laser pulse. The data obtained show how a competing admixture of two or more phases in a high-temperature superconductor can be created and observed evolving. Finally by using new models for interpreting the experimental results the ultrafast dynamics of the competing phases start to be revealed.
XXIII Ciclo
1982
Böhmer, Anna Elisabeth [Verfasser], et H. von [Akademischer Betreuer] Löhneysen. « Competing Phases in Iron-Based Superconductors Studied by High-Resolution Thermal-Expansion and Shear-Modulus Measurements / Anna Elisabeth Böhmer. Betreuer : H. v. Löhneysen ». Karlsruhe : KIT-Bibliothek, 2014. http://d-nb.info/1056955880/34.
Texte intégralAmin, Shara Jalal. « Studies of competing interactions in hydrogen bonded systems ». Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/11976.
Texte intégralJahn, Sandro. « The atomic dynamics of liquids with competing interactions ». Doctoral thesis, [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968854303.
Texte intégralPandit, Shubhrangshu. « Velocity map imaging studies of competing dynamics in the gas phase ». Thesis, University of Bristol, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715743.
Texte intégralLi, Qi 1976. « Competing orders in s-wave and p-wave superconductors ». Thesis, University of Oregon, 2008. http://hdl.handle.net/1794/8285.
Texte intégralThis dissertation investigates the interplay between, and the possible coexistence of, magnetic and superconducting order in metals. We start with studying the electromagnetic properties of s-wave superconductors near a ferromagnetic instability. By using a generalized Ginzburg-Landau theory and scaling arguments, we show that competition between magnetic order and superconducting order can change the scaling of observables. For instance, the exponent for the temperature dependence of the critical current can deviate from the Ginzburg-Landau value of 3/2. These results may be relevant to understanding the observed behavior of MgCNi 3 . We then study the nature of the superconductor-to-normal-metal transition in p-wave superconductors. Although the phase transition is continuous at a mean- field level, a more careful renormalization-group analysis in conjunction with large-n expansion techniques strongly suggest that the transition is first order. This conclusion is the same as for s-wave superconductors, where these techniques also predict a first-order transition. In p-wave superconductors, topological excitations known as skyrmions are known to exist in addition to the more common vortices. In the third part of this dissertation, we study the properties of skyrmion lattices in an external magnetic field. We propose iv experiments to distinguish vortex lattices from skyrmion lattices by means of their melting curves and their μSR signatures.
Adviser: Dietrich Belitz
Wheater, Rhys. « Phase behaviour of colloidal fluids with competing attractive and repulsive effective potentials ». Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.707567.
Texte intégralCao, Alexander. « Dimension Reduction for Stochastic Oscillators : Investigating Competing Generalizations of Phase and Isochrons ». Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1490811963129832.
Texte intégralKamusella, Sirko. « Electronic phase diagrams and competing ground states of complex iron pnictides and chalcogenides ». Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-222083.
Texte intégralSellin, Karl. « Phase transitions and vortex structures in multicomponent superconductors ». Licentiate thesis, KTH, Statistisk fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177141.
Texte intégralQC 20151117
Rajeswaran, Jeevanantham. « JOINT MODELING OF MULTIVARIATE LONGITUDINAL DATA AND COMPETING RISKS DATA ». Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1354508776.
Texte intégralNing, Shuluo. « Bayesian Degradation Analysis Considering Competing Risks and Residual-Life Prediction for Two-Phase Degradation ». Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1339559200.
Texte intégralLim, Sze-Wah. « Competing population : effects of diverse preferences and a finite-size scaling theory of dynamical transitions / ». View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202006%20LIM.
Texte intégralTahilramani, R. A. « An insider Action Research study focusing on synergy realizations during post-merger integration phase between competing organizations ». Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/3004487/.
Texte intégralKamusella, Sirko [Verfasser], Hans-Henning [Akademischer Betreuer] [Gutachter] Klauß et Vadim [Gutachter] Ksenofontov. « Electronic phase diagrams and competing ground states of complex iron pnictides and chalcogenides : A Mössbauer spectroscopy and muon spin rotation/relaxation study / Sirko Kamusella ; Gutachter : Hans-Henning Klauß, Vadim Ksenofontov ; Betreuer : Hans-Henning Klauß ». Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://d-nb.info/112910513X/34.
Texte intégralWeber, Heidrun [Verfasser]. « Correlated exotic states : fractionalization, fermi arcs, competing phases / vorgelegt von Heidrun Weber ». 2009. http://d-nb.info/996603042/34.
Texte intégralWang, Yishu. « Antiferromagnetic Quantum Phase Transitions : Continuous Tuning and Direct Probes of Competing States ». Thesis, 2018. https://thesis.library.caltech.edu/10872/15/Wang-2018-Thesis.pdf.
Texte intégralAntiferromagnets are choice systems to study quantum critical behavior. Unlike ferromagnets, they can experience continuous quantum phase transitions when tuned by pressure. However, the lack of a net magnetization renders experimental approaches difficult and often indirect. Here I demonstrate that both non-resonant and resonant x-ray magnetic diffraction under pressure provide the highly-desired direct probe for microscopic insights into the disappearance of the magnetic order, as well as the evolution of the charge and structural degrees of freedom. In Mo3Sb7, where spins are itinerant with small magnetic moments, we have discovered the doubling of the superconducting transition temperature under pressure and relate it to a lattice change from tetragonal to cubic structure. In MnP, a spiral magnetic order with tightened pitch was revealed in the high-pressure phase near a superconducting state at ∼7 GPa. As the spiral pitch changes, fluctuations move from antiferromagnetic to ferromagnetic at long and short wavelengths, respectively, thereby potentially pro- moting spin-fluctuation-mediated superconductivity of different symmetries. In the all-in-all-out (AIAO) pyrochlore antiferromagnet Cd2Os2O7, we discovered an anti- ferromagnetic quantum critical point at 35.8 GPa using new techniques for resonant x-ray magnetic diffraction under pressure. The continuous suppression of AIAO antiferromagnetic order to zero temperature is accompanied by inversion symmetry breaking of the lattice, dividing the P − T phase space into three regions of different time reversal and spatial inversion symmetries. While phase lines of opposite curvature indicate a striking departure from a mean-field form at high pressure, the intertwined spin, charge, and phonon fluctuation modes point to a strong-coupled scenario of quantum criticality.
Kamusella, Sirko. « Electronic phase diagrams and competing ground states of complex iron pnictides and chalcogenides : A Mössbauer spectroscopy and muon spin rotation/relaxation study ». Doctoral thesis, 2016. https://tud.qucosa.de/id/qucosa%3A30237.
Texte intégralJiang, Kun-Lin, et 江昆霖. « Studies on the effect of environmental temperature and the log-phase on the transformation efficiency of the competent cells derived from Erwinia carotovora subsp. carotovora ». Thesis, 2005. http://ndltd.ncl.edu.tw/handle/22199411566240912404.
Texte intégral國立中興大學
化學系
93
The brg gene is a bactoriocin regulator gene of Erwinia carotovora subspecies carotovora. This study is to understand the interaction between brg and other’s bacteriocin regulator gene. Here, we knock out the brg gene from the Erwinia competent cell by homologous recombination. In order to produce a mutant, we prepare competent cell use a modified version of Hanahan and the best growing conditions of Erwinia carotovora subspecies carotovora to improve the efficiency of transformation. By studying of the transformation efficiency under the different growing temperatures and log phases, we can find the discrepancy of different bacteria strains. In bacteria strains H-rif-8-6、M-rif-11-2 and TO-4, there are have different transformation frequency range with the plasmids pBR322, pBluescript, and pACYC177 under 29℃, 32℃, and 35℃. After modification, the transformation efficiency range from 5×103 to 1×104(cfu/μg)of plasmid DNA in H-rif-8-6 under 29℃, the range from 1×104 to 2×104(cfu/μg)of plasmid DNA in M-rif-11-2 under 32℃ and 35℃, and the range from 4.2×102 to 8.4×102(cfu/μg)of plasmid DNA in TO-4 under 29℃, 32℃, and 35℃. In the high temperature like 35℃ and 37℃, H-rif-8-6 has the special competence different from M-rif-8-6 and TO-4. H-rif-8-6 can not growing in the high temperature; M-rif-11-2 can growing under 35℃, but not under 37℃; TO-4 can grow in the high temperature. On the other hand, combine the best growing conditions with the modified solution; the transformation efficiency can increase 20-fold in H-rif-8-6 competent cell, and increase 90-fold in M-rif-11-2 competent cell.