Inverse Magnetocaloric Effect in Spin-1/2 Fisher's Super-Exchange Antiferromagnet |

L. Gálisová
^{a} and J. Strečka^{ b}^{a}Department of Applied Mathematics and Informatics, Faculty of Mechanical Engineering, Technical University, Letná 9, 042 00 Košice, Slovakia
^{b}Institute 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 T_{c}(h≠0)<T<T_{c}(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 |