Universal low-temperature behavior of frustrated quantum antiferromagnets in the vicinity of the saturation field

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We study the low-temperature thermodynamic properties of a number of frustrated quantum antiferromagnets which support localized magnon states in the vicinity of the saturation field. For this purpose we use 1) a mapping of the low-energy degrees of freedom of spin systems onto the hard-core object lattice gases and 2) an exact diagonalization of finite spin systems of up to N=30 sites. The considered spin systems exhibit universal behavior which is determined by a specific hard-core object lattice gas representing the independent localized magnon states. We test the lattice gas description by comparing its predictions with the numerical results for low-lying energy states of finite spin systems. For all frustrated spin systems considered we find a strong variation of the low-temperature specific heat passing the saturation field and a maximum in the isothermal entropy at saturation field resulting in an enhanced magnetocaloric effect.
21 pages, 8 figures

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Strongly Correlated Electrons, Statistical Mechanics

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http://salesiana.dossiersoluciones.com/handle/123456789/109584

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0604023
 http://arxiv.org/abs/cond-mat/0604023
 The European Physical Journal B, Vol. 52, No. 1 (July I 2006), p. 23-36
 doi:10.1140/epjb/e2006-00273-y

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arXiv