Magnetic refrigeration down to 0.2 K by heavy fermion metal YbCu4Ni

Ytterbium-based heavy-fermion metals have recently attracted attention as magnetic refrigeration materials generating low-temperature environments below 1 K without using expensive 3 He. YbCu 4 Ni is known to exhibit a giant value of specific heat divided by temperature C / T ∼ 7.5 J / K 2 mol below...

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Bibliographic Details
Published in:Journal of applied physics 2022-01, Vol.131 (1)
Main Authors: Shimura, Yasuyuki, Watanabe, Kanta, Taniguchi, Takanori, Osato, Kotaro, Yamamoto, Rikako, Kusanose, Yuka, Umeo, Kazunori, Fujita, Masaki, Onimaru, Takahiro, Takabatake, Toshiro
Format: Article
Language:English
Subjects:
Fermions
Low temperature environments
Refrigeration
Specific heat
Thermal conductivity
Ytterbium
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Summary:Ytterbium-based heavy-fermion metals have recently attracted attention as magnetic refrigeration materials generating low-temperature environments below 1 K without using expensive 3 He. YbCu 4 Ni is known to exhibit a giant value of specific heat divided by temperature C / T ∼ 7.5 J / K 2 mol below 0.2 K, implying high potential of magnetic refrigeration. In this paper, we report magnetic refrigeration down to 0.2 K from the initial temperatures of 1.8 K by YbCu 4 Ni ingots installed in a commercial 4 He refrigerator. The performance is consistent with that evaluated by our DC magnetization and specific heat measurements. Our study demonstrates the high performance of YbCu 4 Ni without precious metals as a magnetic refrigeration material with moderately high density of Yb atoms ( ∼ 0.02 Yb mol / cm 3) and high thermal conductivity.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0064355