Universal low-temperature behavior of frustrated quantum antiferromagnets in the vicinity of the saturation field
O. Derzhko () and
J. Richter
The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 52, issue 1, 23-36
Abstract:
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. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006
Keywords: 75.10.Jm Quantized spin models; 75.45.+j Macroscopic quantum phenomena in magnetic systems; 75.30.Sg Magnetocaloric effect; magnetic cooling (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00273-y
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