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Isothermal Entropy Change for the Spin-1 Blume-Capel Model on the Bethe Lattice

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Abstract

The isothermal entropy change of spin-1 Blume-Capel (BC) is investigated on the Bethe lattice (BL) with the variations of coordination numbers (q), crystal field (D) and external magnetic field (H) in the vicinity of critical temperatures, i.e. about the second- and first-order phase transition temperatures. The calculation is carried on the BL in terms of exact recursion relations. It is found that the peaks of the isothermal entropy variation obtained for both magnetization and quadrupole moments are observed to be increasing with increasing values of H for given D and q, decreasing with the increasing q for fixed D and H and also decreasing with the increasing values of D for constant q and H. The peaks of the curves for the quadrupole moment is less sharper then the ones obtained for the magnetization.

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  1. Department of Physics, Erciyes University, 38039, Kayseri, Turkey

    Erhan Albayrak

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  1. Erhan Albayrak
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Correspondence to Erhan Albayrak.

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Albayrak, E. Isothermal Entropy Change for the Spin-1 Blume-Capel Model on the Bethe Lattice. Int J Theor Phys 58, 4111–4118 (2019). https://doi.org/10.1007/s10773-019-04277-3

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  • DOI: https://doi.org/10.1007/s10773-019-04277-3

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