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Phase diagram of a frustrated Heisenberg model: From disorder to order and back again

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Miranda, Michel M. J. [1, 2, 3, 4] ; Almeida, Igor C. [2] ; Andrade, Eric C. [2] ; Hoyos, Jose A. [2]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden - Germany
[2] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
[3] Max Planck Inst Chem Phys Fester Stoffe, Nothnitzer Str 40, D-01187 Dresden - Germany
[4] Tech Univ Dresden, Wurzburg Dresden Cluster Excellence Ct Qmat, D-01062 Dresden - Germany
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 104, n. 5 AUG 4 2021.
Citações Web of Science: 0

We study the effects of bond and site disorder in the classical J(1)-J(2) Heisenberg model on a square lattice in the order-by-disorder frustrated regime 2J(2) > vertical bar J(1)vertical bar. Combining symmetry arguments, numerical energy minimization, and large-scale Monte Carlo simulations, we establish that the finite-temperature Ising-type transition of the clean system is destroyed in the presence of any finite concentration of impurities. We explain this finding via a random-field mechanism which generically emerges in systems where disorder locally breaks the same real-space symmetry spontaneously globally broken by the associated order parameter. We also determine that the phase replacing the clean one is a paramagnet polarized in the nematic glass order with nontrivial magnetic response. This is because disorder also induces noncollinear spin-vortex-crystal order and produces a conjugated transverse dipolar random field. As a result of these many competing effects, the associated magnetic susceptibilities are nonmonotonic functions of the temperature. As a further application of our methods, we show the generation of random axes in other frustrated magnets with broken SU(2) symmetry. We also discuss the generality of our findings and their relevance to experiments. (AU)

Processo FAPESP: 19/17026-9 - Magnetos frustrados: anisotropia e inomogeneidades
Beneficiário:Eric de Castro e Andrade
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 19/17645-0 - Excitações magnéticas em magnetos frustrados inomogêneos
Beneficiário:Igor César de Almeida
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 15/23849-7 - Cadeias quânticas de spins
Beneficiário:Francisco Castilho Alcaraz
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 16/10826-1 - EMU concedido no processo 2015/23849-7: cluster de computadores
Beneficiário:Francisco Castilho Alcaraz
Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários