Enhanced Magnetocaloric Effect due to Selective Dilution in a Triangular Ising Antiferromagnet
M. Borovský and M. Žukovič
Institute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 040 01 Košice, Slovakia
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We employ an effective-field theory with correlations in order to study a magnetocaloric effect on a triangular Ising antiferromagnet, which is selectively diluted by non-magnetic impurities on one of the three sublattices. Such a dilution generally relieves massive degeneracy in our system and therefore the ground-state entropy diminishes and the magnetocaloric effect weakens at low temperatures. However, at relatively higher temperatures we can observe significantly enhanced negative isothermal entropy changes for the sublattice concentration pA=0.8.

DOI: 10.12693/APhysPolA.131.645
PACS numbers: 05.50.+q, 75.50.Ee, 75.30.Sg, 05.10.Ln