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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Random-bond disorder in two-dimensional noncollinear XY antiferromagnets: From quasi-long-range order to spin glass

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Autor(es):
Dey, Santanu [1, 2] ; Andrade, Eric C. [3] ; Vojta, Matthias [1, 2]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden - Germany
[2] Tech Univ Dresden, Wurzburg Dresden Cluster Excellence Ctqmat, D-01062 Dresden - Germany
[3] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 102, n. 12 SEP 14 2020.
Citações Web of Science: 0
Resumo

We study the effects of quenched bond disorder in frustrated easy-plane antiferromagnets in two space dimensions, using a combination of analytical and numerical techniques. We consider local-moment systems which display noncollinear long-range order at zero temperature, with the antiferromagnetic triangular-lattice XY model as a prime example. We show that (i) weak bond disorder transforms the clean ground state into a state with quasi-long-range order, and (ii) strong bond disorder results in a short-range-ordered glassy ground state. Using extensive Monte Carlo simulations, we also track the fate of the quasi-long-range-ordered phase at finite temperature and the associated Kosterlitz-Thouless-like transition. Making contact with previous studies of disordered XY models, we discuss similarities and differences concerning the interplay of disorder and frustration. Our results are also of relevance to noncollinear Heisenberg magnets in an external magnetic field. (AU)

Processo FAPESP: 19/17026-9 - Magnetos frustrados: anisotropia e inomogeneidades
Beneficiário:Eric de Castro e Andrade
Linha de fomento: Auxílio à Pesquisa - Regular