The study of mixed spin-1 and spin-1/2: Entropy and isothermal entropy change

Erhan Albayrak

Physica A: Statistical Mechanics and its Applications, 2020, vol. 559, issue C

Abstract: The entropy and isothermal entropy change of the mixed spin-(1,1/2) Ising model are examined on the Bethe lattice by using the exact recursion relations (ERR) for the coordination numbers q=3,4 and 6. It is found that entropy presents a little kink at the second-order phase transitions and increases as q decreases for zero external magnetic field (H). As the crystal field (D) increases, the temperatures of the lines move to higher temperatures and they all combine together with further increase of temperature for each q. When H is introduced, the kinks disappear and the lines move to higher temperatures as D increases for given H. The peaks of isothermal entropy change increase as Hmax increases. The peaks are higher for appropriate values of D and Hmax with lower q’s. Two exceptions occur at higher Hmax and lower negative D’s, i.e. the peaks for higher q can extend beyond the one for lower q.

Keywords: Blume–Capel; Mixed-spin; Entropy; Isothermal entropy; Bethe lattice; Exact recursion relations (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:559:y:2020:i:c:s0378437120305653

DOI: 10.1016/j.physa.2020.125079

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