Enhanced magnetocaloric effect in frustrated magnets

Article

关键词: GADOLINIUM GALLIUM GARNET;    FIELD-INDUCED TRANSITIONS;    KAGOME ANTIFERROMAGNET;    PHASE-TRANSITION;    SPIN-LIQUID;    ORDER;    PYROCHLORE;    RANGE;    REFRIGERATORS;    EXCITATIONS;   

DOI  :  10.1103/PhysRevB.67.104421

来源: SCIE

【 摘 要 】

The magnetothermodynamics of strongly frustrated classical Heisenberg antiferromagnets on kagome, garnet, and pyrochlore lattices is examined. The field induced adiabatic temperature change (partial derivativeT/partial derivativeH)(S) is significantly larger for such systems compared to ordinary nonfrustrated magnets and also exceeds the cooling rate of an ideal paramagnet in a wide range of fields. An enhancement of the magnetocaloric effect is related to the presence of a macroscopic number of soft modes in frustrated magnets below the saturation field. Theoretical predictions are confirmed with extensive Monte Carlo simulations.

【 授权许可】

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