Magnetic refrigeration down to 0.2 K by heavy fermion metal YbCu4Ni

Yasuyuki Shimura, Kanta Watanabe, Takanori Taniguchi, Kotaro Osato, Rikako Yamamoto, Yuka Kusanose, Kazunori Umeo, Masaki Fujita, Takahiro Onimaru, Toshiro Takabatake

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2 Citations (Scopus)


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.

Original languageEnglish
Article number013903
JournalJournal of Applied Physics
Issue number1
Publication statusPublished - 2022 Jan 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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