Journal
JOURNAL OF APPLIED PHYSICS
Volume 124, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5048696
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Funding
- National Natural Science Foundation of China [51671048]
- Fundamental Research Funds for the Central Universities [N170904001, N170908001]
- Research Funds for Innovation Talents in Universities and Colleges of Liaoning Province [LR2016003]
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The crystal structure, and cryogenic magnetic and magnetocaloric properties in RE2T2Al (RE = Dy, Ho, Er, and Tm; T = Co and Ni) compounds have been investigated. All the compounds belong to an orthorhombic W2B2Co-type structure (Immm space group). A second order paramagnetic to ferromagnetic phase transition exists for RE2Co2Al compounds at T-C = 62, 27, 32, and 11.5 K, whereas the compounds of RE2Ni2Al undergo a paramagnetic to antiferromagnetic phase transition with the Neel temperatures (T-N) of 19, 12, 12.5, and 6 K for RE = Dy, Ho, Er, and Tm, respectively. Moreover, an additional low temperature magnetic transition occurs for all present RE2T2Al compounds. An obvious hysteresis was observed at a low temperature in the Dy2Co2Al, Ho2Co2Al, and Er2Co2Al compounds. The values of the maximum magnetic entropy change (-Delta S-M(max)) are 10.4, 11.5, 5.9, 7.7, 6.0, and 16.2 J/kg K for Dy2Co2Al, Ho2Co2Al, Er2Co2Al, Tm2Co2Al, Ho2Ni2Al, and Er2Ni2Al compounds with a field change (Delta H) of 0-5 T, respectively. Moreover, two peaks (or shoulder) in the -Delta S-M (T) curves of Ho2Co2Al can be observed, which lead to a wide cooling temperature interval. Published by AIP Publishing.
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