Universality in the entropy change for the inverse magnetocaloric effect

被引:72
作者
Biswas, Anis [1 ]
Chandra, Sayan [1 ]
Samanta, Tapas [2 ]
Ghosh, Barnali [3 ]
Datta, Subarna [3 ]
Phan, M. H. [1 ]
Raychaudhuri, A. K. [3 ]
Das, I. [2 ]
Srikanth, H. [1 ]
机构
[1] Univ S Florida, Dept Phys, Tampa, FL 33620 USA
[2] Saha Inst Nucl Phys, Expt Condensed Matter Phys Div, Kolkata 700064, W Bengal, India
[3] SN Bose Natl Ctr Basic Sci, Unit Nanosci, Kolkata 700098, India
关键词
FIELD-DEPENDENCE;
D O I
10.1103/PhysRevB.87.134420
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A comprehensive study of the temperature (T) and magnetic field (H) dependence of magnetic entropy change (Delta S-M) for different materials exhibiting inverse magnetocaloric effect (IMCE) is reported. We show that Delta S-M follows a power-law dependence of H (Delta S-M similar to H-n; n is an exponent) for these compounds. In contrast to conventional magnetocaloric effect (CMCE), n is independent of H and T in the case of IMCE. As a result, a universal master curve can be constructed to describe Delta S-M (T) of the IMCE systems for different H without rescaling the temperature axis. This is completely different from that reported for CMCE, where the rescaling of the temperature axis with the introduction of at least one reference temperature is needed for constructing a universal curve. The different universal behavior of IMCE is attributed to the constant value of n in any field and temperature, which is a generic feature of IMCE systems irrespective of their magnetic state and nature of phase transition. From the proposed phenomenological universal curve, one can extrapolate the magnetocaloric properties of IMCE systems in any temperature and magnetic field range, which would be helpful in designing controlled active magnetic refrigeration devices. DOI: 10.1103/PhysRevB.87.134420
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页数:7
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