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Magnetic excitations in inhomogeneous frustrated magnets

Grant number: 19/17645-0
Support Opportunities:Scholarships in Brazil - Doctorate
Start date: November 01, 2019
End date: January 31, 2023
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Eric de Castro e Andrade
Grantee:Igor César de Almeida
Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

Disorder is always present in solids. Typical examples of disorder in magnets described by local spin moments are the lack or presence of extra spins, caused, for example, by the intentional or unintentional chemical substitution of elements during the growth of the samples. In this project, we will study frustrated disordered spin-S antiferromagnets that, in their homogeneous limit, show magnetic long-ranged magnetic order in their ground state. We will then consider the effects of inhomogeneities, usually vacancies or modulations on the magnetic couplings, in this long-range order, especially where these defects suppress ordering. We seek to identify not only the resulting ground states, for example, a spin-glass or a random singlet phase, but also the spectrum of low energy excitations. Thus, we will study the characteristic signatures of these phases by analyzing their thermodynamic, spectroscopic, and transport responses. To implement this program, we will use a combination of techniques such as mean-field theory, perturbation theory, and spin-waves. (AU)

News published in Agência FAPESP Newsletter about the scholarship:
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Scientific publications
(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)
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)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
ALMEIDA, Igor César de. Low energy excitations on frustrated disordered correlated systems. 2023. Doctoral Thesis - Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) São Carlos.