Scaling of the magnetic entropy change in spinel selenide CuCr 2Se 4

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Abstract

The magnetic entropy change (Δ SM) of the spinel selenide CuCr 2Se 4 has been thoroughly investigated around Curie temperature TC=430K. It is found that the temperature dependence of Δ SM under different applied fields H presents a unimodal shape only below 1 T, while the full width at half maximum δ TFWHM becomes broad with the increase of H. We suggest that the suppression of the spin-orbit coupling between Cr 3 3d electrons and Se 4p states by the external field should be responsible for the suppression of Δ SM. In addition, it is displayed that the maximum of Δ SM depends on H n with n=0.63±0.05 obtained by experiment, in agreement with that n=0.62±0.06 deduced by the critical analysis. The relative cooling power [RCP(S)] increases with H fulfilling the relation RCP(S)= aHb, where a=25.4±0.5 J/kg T and b=0.93±0.08. With the scaling laws of Δ SM, the experimental Δ SM(T,H) collapse onto a universal curve, where an average curve is obtained. With the phenomenological universal curve, the experimental Δ SM(T,H) are well predicted. © 2012 Elsevier B.V. All rights reserved.

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Zhang, L., Fan, J., Tong, W., Ling, L., Pi, L., & Zhang, Y. (2012). Scaling of the magnetic entropy change in spinel selenide CuCr 2Se 4. Physica B: Condensed Matter, 407(17), 3543–3546. https://doi.org/10.1016/j.physb.2012.05.020

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