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dc.creatorRojas, Onofre-
dc.creatorStrečka, J.-
dc.creatorSouza, S. M. de-
dc.date.accessioned2019-08-27T12:59:28Z-
dc.date.available2019-08-27T12:59:28Z-
dc.date.issued2016-11-
dc.identifier.citationROJAS, O.; STREČKA, J.; SOUZA, S. M. de. 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. Solid State Communications, [S.l.], v. 246, p. 68-75, Nov. 2016.pt_BR
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0038109816301880pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/36460-
dc.description.abstractThe 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.pt_BR
dc.languageen_USpt_BR
dc.publisherElsevierpt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceSolid State Communicationspt_BR
dc.subjectIsing-Heisenberg modelpt_BR
dc.subjectSpin ladderpt_BR
dc.subjectSpecific heatpt_BR
dc.subjectEntanglementpt_BR
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 couplingspt_BR
dc.typeArtigopt_BR
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