Thermal entanglement and sharp specific-heat peak in an exactly solved spin-1/2 Ising-Heisenberg ladder with alternating Ising and Heisenberg inter-leg couplings

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorRojas, Onofre-
Autor(es): dc.creatorStrečka, J.-
Autor(es): dc.creatorSouza, S. M. de-
Data de aceite: dc.date.accessioned2026-02-09T12:32:49Z-
Data de disponibilização: dc.date.available2026-02-09T12:32:49Z-
Data de envio: dc.date.issued2019-08-27-
Data de envio: dc.date.issued2019-08-27-
Data de envio: dc.date.issued2016-11-
Fonte completa do material: dc.identifierhttps://repositorio.ufla.br/handle/1/36460-
Fonte completa do material: dc.identifierhttps://www.sciencedirect.com/science/article/pii/S0038109816301880-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1163474-
Descrição: dc.descriptionThe spin-1/2 Ising-Heisenberg two-leg ladder accounting for alternating Ising and Heisenberg inter–leg couplings in addition to the Ising intra–leg coupling is rigorously mapped onto to a mixed spin-(3/2,1/2) Ising-Heisenberg diamond chain with the nodal Ising spins and the interstitial spin-1/2 Heisenberg dimers. The latter effective model with higher-order interactions between the nodal and interstitial spins is subsequently exactly solved within the transfer-matrix method. The model under investigation exhibits five different ground states: ferromagnetic, antiferromagnetic, superantiferromagnetic and two types of frustrated ground states with a non-zero residual entropy. A detailed study of thermodynamic properties reveals an anomalous specific-heat peak at low enough temperatures, which is strongly reminiscent because of its extraordinary height and sharpness to an anomaly accompanying a phase transition. It is convincingly evidenced, however, that the anomalous peak in the specific heat is finite and it comes from vigorous thermal excitations from a two-fold degenerate ground state towards a macroscopically degenerate excited state. Thermal entanglement between the nearest-neighbor Heisenberg spins is also comprehensively explored by taking advantage of the concurrence. The threshold temperature delimiting a boundary between the entangled and disentangled parameter space may show presence of a peculiar temperature reentrance.-
Idioma: dc.languageen-
Publicador: dc.publisherElsevier-
Direitos: dc.rightsrestrictAccess-
???dc.source???: dc.sourceSolid State Communications-
Palavras-chave: dc.subjectIsing-Heisenberg model-
Palavras-chave: dc.subjectSpin ladder-
Palavras-chave: dc.subjectSpecific heat-
Palavras-chave: dc.subjectEntanglement-
Título: dc.titleThermal entanglement and sharp specific-heat peak in an exactly solved spin-1/2 Ising-Heisenberg ladder with alternating Ising and Heisenberg inter-leg couplings-
Tipo de arquivo: dc.typeArtigo-
Aparece nas coleções:Repositório Institucional da Universidade Federal de Lavras (RIUFLA)

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