Journal
JOURNAL OF APPLIED PHYSICS
Volume 124, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5044578
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Funding
- National Natural Science Foundation of China [51501036]
- Independent Research and Development Project of State Key Laboratory of Advanced Special Steel, Shanghai University
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The intermetallic gallium compounds RE2Co2Ga with different rare earths (RE = Dy, Ho, Er, and Tm) were synthesized, and their crystal structure, microstructure, magnetic, and cryogenic magneto-caloric performances were investigated. The RE2Co2Ga compounds crystallize with an ordered orthorhombic W2B2Co-type structure (space group Immm). All the RE2Co2Ga compounds undergo ferromagnetic (FM) ordering (second-order) from a paramagnetic to FM transition which induces reversible magneto-caloric effects (MCE). The Curie temperatures (T-C) in RE2Co2Ga compounds are determined to be 55.0, 38.5, 25.5, and 11.6 K for RE = Dy, Ho, Er, and Tm, respectively, which fulfill the de Gennes scaling. The RE2Co2Ga compounds show relatively small MCE (i.e., -Delta S-M, isothermal magnetic entropy change) around their own phase transition temperatures, and the maximal values of -Delta S-M are 7.5, 14.6, 11.2, and 13.2 J/kg K in the field change (Delta H) of 7T for RE = Dy, Ho, Er, and Tm, respectively. Accordingly, the values of the relative cooling power are 212, 335, 304, and 239 J/kg, respectively. Published by AIP Publishing.
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