Inverse Magnetocaloric Effect in Spin-1/2 Fisher's Super-Exchange Antiferromagnet
L. Gálisováa and J. Strečka b
aDepartment of Applied Mathematics and Informatics, Faculty of Mechanical Engineering, Technical University, Letná 9, 042 00 Košice, Slovakia
bInstitute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia
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The isothermal entropy change and the adiabatic temperature change are rigorously calculated for the exactly solved spin-1/2 Fisher's super-exchange antiferromagnet in order to examine magnetocaloric properties of the model in a vicinity of the second-order phase transition. It is shown that the large inverse magnetocaloric effect occurs around the temperature interval Tc(h≠0)<T<Tc(h=0) for any magnetic-field change Δh: 0 → h. The most pronounced inverse magnetocaloric effect can be found for the magnetic-field change, which coincides with the critical field of a zero-temperature phase transition from the antiferromagnetically ordered ground state to the paramagnetic one.

DOI: 10.12693/APhysPolA.131.627
PACS numbers: 05.50.+q, 75.30.Et, 75.30.Sg, 75.30.Kz