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Frustrated magnets: anisotropy and and inhomogeneities

Grant number: 19/17026-9
Support Opportunities:Regular Research Grants
Duration: December 01, 2019 - November 30, 2021
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Eric de Castro e Andrade
Grantee:Eric de Castro e Andrade
Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

The concepts of order, disorder, and spontaneous symmetry breaking - as initially formalized in Landau's seminal work on Phase Transitions - constitute the bases of our modern understanding of several exciting phenomena in Condensed Matter Physics. Recently, however, our view of these basic concepts was substantially expanded, primarily because of the frustrated magnets. Every day, novel phases, both solid (with magnetic order) and liquid (without magnetic order) are proposed and observed in these systems in the low-temperature regime. The primary goal of this project is to discover and study unusual phases of the matter occurring in strongly correlated systems in the presence of frustration, inhomogeneities, and external perturbations such as magnetic fields. We seek to identify not only new ground states, but also to investigate the low energy excitation spectrum, which we employ to study the thermodynamical, spectroscopic, and transport responses of the phases. To implement this program, we will combine analytical techniques (such as slave particle mean-field theories and spin-waves) and numerical techniques (such as classical and variational Monte Carlo and exact diagonalization). Key ingredients in our investigation are strong electron-electron interaction, appreciable spin-orbit coupling, geometrically frustrated lattices, and deviation from the crystalline structure. (AU)

Articles published in Pesquisa FAPESP Magazine about the research grant:
Una exótica fase de la materia puede ser útil para desarrollar computadoras cuánticas 
Exotic phase of matter could be useful in the development of quantum computers 
Articles published in Agência FAPESP Newsletter about the research grant:
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Scientific publications (8)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
HAEUSSLER, ELLEN; SICHELSCHMIDT, JOERG; BAENITZ, MICHAEL; ANDRADE, ERIC C.; VOJTA, MATTHIAS; DOERT, THOMAS. Diluting a triangular-lattice spin liquid: Synthesis and characterization of NaYb1-xLuxS2 single crystals. PHYSICAL REVIEW MATERIALS, v. 6, n. 4, p. 8-pg., . (19/17026-9)
MIRANDA, MICHEL M. J.; ALMEIDA, IGOR C.; ANDRADE, ERIC C.; HOYOS, JOSE A.. Phase diagram of a frustrated Heisenberg model: From disorder to order and back again. Physical Review B, v. 104, n. 5, . (19/17026-9, 19/17645-0, 15/23849-7, 16/10826-1)
CONSOLI, PEDRO M.; JANSSEN, LUKAS; VOJTA, MATTHIAS; ANDRADE, ERIC C.. Heisenberg-Kitaev model in a magnetic field: 1/S expansion. Physical Review B, v. 102, n. 15, . (19/17026-9, 19/02099-0, 17/22133-3)
DANTAS, VITOR; ANDRADE, ERIC C.. Disorder, Low-Energy Excitations, and Topology in the Kitaev Spin Liquid. Physical Review Letters, v. 129, n. 3, p. 7-pg., . (19/17026-9)
DEY, SANTANU; ANDRADE, ERIC C.; VOJTA, MATTHIAS. Random-bond disorder in two-dimensional noncollinear XY antiferromagnets: From quasi-long-range order to spin glass. PHYSICAL REVIEW B, v. 102, n. 12, p. 8-pg., . (19/17026-9)
CONSOLI, PEDRO M.; JANSSEN, LUKAS; VOJTA, MATTHIAS; ANDRADE, ERIC C.. Heisenberg-Kitaev model in a magnetic field: 1/S expansion. PHYSICAL REVIEW B, v. 102, n. 15, p. 21-pg., . (19/02099-0, 19/17026-9, 17/22133-3)
ANDRADE, ERIC C.; JANSSEN, LUKAS; VOJTA, MATTHIAS. Susceptibility anisotropy and its disorder evolution in models for Kitaev materials. PHYSICAL REVIEW B, v. 102, n. 11, p. 12-pg., . (19/17026-9)
DEY, SANTANU; ANDRADE, ERIC C.; VOJTA, MATTHIAS. Random-bond disorder in two-dimensional noncollinear XY antiferromagnets: From quasi-long-range order to spin glass. Physical Review B, v. 102, n. 12, . (19/17026-9)

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