Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/36461
Title: Spin frustration of a spin-1/2 Ising-Heisenberg three-leg tube as an indispensable ground for thermal entanglement
Keywords: Ising-Heisenberg tube
Spin frustration
Thermal entanglement
Chirality
Issue Date: Jul-2016
Publisher: Elsevier
Citation: STREČKA, J. et al. Spin frustration of a spin-1/2 Ising-Heisenberg three-leg tube as an indispensable ground for thermal entanglement. Journal of Magnetism and Magnetic Materials, [S.l.], v. 409, p. 124-133, July 2016.
Abstract: The spin-1/2 Ising–Heisenberg three-leg tube composed of the Heisenberg spin triangles mutually coupled through the Ising inter-triangle interaction is exactly solved in a zero magnetic field. By making use of the local conservation for the total spin on each Heisenberg spin triangle the model can be rigorously mapped onto a classical composite spin-chain model, which is subsequently exactly treated through the transfer-matrix method. The ground-state phase diagram, correlation functions, concurrence, Bell function, entropy and specific heat are examined in detail. It is shown that the spin frustration represents an indispensable ground for a thermal entanglement, which is quantified by the quantum concurrence. The specific heat displays diverse temperature dependences, which may include a sharp low-temperature peak mimicking a temperature-driven first-order phase transition. It is convincingly evidenced that this anomalous peak originates from massive thermal excitations from the doubly degenerate ground state towards an excited state with a high macroscopic degeneracy due to chiral degrees of freedom of the Heisenberg spin triangles.
URI: https://www.sciencedirect.com/science/article/pii/S0304885316301925
http://repositorio.ufla.br/jspui/handle/1/36461
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