Phase diagrams of the mixed spin-1 and spin-1/2 Ising–Heisenberg model on the diamond-like decorated Bethe lattice

Autor:	Michal Jaščur, Jozef Strečka, Cesur Ekiz
Rok vydání:	2011
Předmět:	Physics Phase transition Spins Bethe lattice Condensed matter physics Heisenberg model Condensed Matter::Strongly Correlated Electrons Ising model Condensed Matter Physics Spin (physics) Electronic Optical and Magnetic Materials Phase diagram Bethe ansatz
Zdroj:	Journal of Magnetism and Magnetic Materials. 323:493-498
ISSN:	0304-8853
DOI:	10.1016/j.jmmm.2010.10.001
Popis:	The ground-state and finite-temperature behavior of the mixed spin-1 and spin-1/2 Ising–Heisenberg model on the diamond-like decorated Bethe lattice is investigated within the framework of two rigorous methods: the decoration-iteration transformation and exact recursion relations. The model under consideration describes a hybrid classical-quantum system consisting of the Ising and Heisenberg spins, which interact among themselves either through the Ising or XXZ Heisenberg nearest-neighbor interaction. Both sublattice magnetizations of the Ising and Heisenberg spins are exactly calculated with the aim to examine phase diagrams, thermal variations of the total and sublattice magnetizations. The finite-temperature phase diagrams form continuous (second-order) phase transition lines only, which exhibit a small reentrant region if the diamond-like decorated Bethe lattice with a sufficiently high coordination number is considered.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0f8e72318f8adc729f4bfd9ed4caa755 https://doi.org/10.1016/j.jmmm.2010.10.001 Zobrazit plný text záznamu Full Text from ScienceDirect