Large anisotropic magnetocaloric effect in ferromagnetic semimetal PrAlSi

We report on the large anisotropic magnetocaloric effect of PrAlSi, a ferromagnetic semimetal of current interest with a probable topologically nontrivial electronic structure. The maximum magnetic entropy change amounts to − Δ S M = 22.6 J / kg K near the Curie temperature T C = 17.8 K under a magn...

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Bibliographic Details
Published in:Journal of applied physics 2020-05, Vol.127 (19)
Main Authors: Lyu, Meng, Wang, Zhen, Ramesh Kumar, K., Zhao, Hengcan, Xiang, Junsen, Sun, Peijie
Format: Article
Language:English
Subjects:
Applied physics
Curie temperature
Electric fields
Electronic structure
Entropy
Ferromagnetism
Magnetic anisotropy
Magnetism
Spin glasses
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Summary:We report on the large anisotropic magnetocaloric effect of PrAlSi, a ferromagnetic semimetal of current interest with a probable topologically nontrivial electronic structure. The maximum magnetic entropy change amounts to − Δ S M = 22.6 J / kg K near the Curie temperature T C = 17.8 K under a magnetic field change of μ 0 Δ H = 5 T along the magnetic easy c axis. A highly relevant feature is the small crystalline electric field splitting of the Pr 3 + ( J = 4) multiplet, which appears to be comparable with the effective exchange interaction in the magnetic ordering. This leads to the full saturation moment of the Pr 3 + ion in small fields and an accumulation of magnetic entropy in the vicinity of the magnetic ordering. The weakly first-order nature of the ferromagnetic transition and the subsequent reentrant spin-glass transitions below T C are features further enhancing the magnetocaloric effect. Given the strong magnetic anisotropy, a large rotating magnetocaloric effect becomes achievable in this material.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0007217