Magnetocaloric effect in one-dimensional antiferromagnets

Details Magnetocaloric effect in one-dimensional antiferromagnets Magnetocaloric effect in one-dimensional antiferromagnets

2004-04-28

arxiv.org/abs/cond-mat/0404683v2

J. Stat. Mech.: Theor. Exp. (2004) P07012

Physics

Condensed Matter

Strongly Correlated Electrons

accepted version, 20 pages

Scientific paper

10.1088/1742-5468/2004/07/P07012

An external magnetic field induces large relative changes in the entropy of one-dimensional quantum spin systems at finite temperatures. This leads to a magnetocaloric effect, i.e. a change in temperature during an adiabatic (de)magnetization process. Several examples of one-dimensional spin-1/2 models are studied by employing the Jordan-Wigner transformation and exact diagonalization. During an adiabatic (de)magnetization process temperature drops in the vicinity of a field-induced zero-temperature quantum phase transition. Comparing different levels of frustration, we find that more frustrated systems cool down to lower temperatures. For geometrically frustrated spin models a finite entropy survives down to zero temperature at certain magnetic fields. This property suggests frustrated quantum spin systems as promising alternative refrigerant materials for low-temperature magnetic refrigeration.

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