@article{876662e95cb148df8155ae7753004b49,
title = "Magnetic refrigeration down to 0.2 K by heavy fermion metal YbCu4Ni",
abstract = "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. ",
author = "Yasuyuki Shimura and Kanta Watanabe and Takanori Taniguchi and Kotaro Osato and Rikako Yamamoto and Yuka Kusanose and Kazunori Umeo and Masaki Fujita and Takahiro Onimaru and Toshiro Takabatake",
note = "Funding Information: This work was financially supported by projects JSPS KAKENHI Grant Nos. JP19K23417, JP17K05545, JP15H05886, JP18KK0078, and JP18H01182. Y.S. thanks the Japanese funding support from “Iketani Science and Technology Foundation” (No. 0321131-A), “The Thermal and Electric Energy and Technology Foundation” (No. 007 in 2020), and “JGC-S Scholarship Foundation” (No. 2010). The crystal structure of YbCu4Ni in Fig. 1(i) was drawn by VESTA.31 Some parts of the magnetic refrigeration system in Fig. 1(ii) were machined at Monozukuri (Craft work) Plaza, Hiroshima University. The measurements at low temperature and composition analysis of YbCu4Ni were performed at N-BARD, Hiroshima University. Publisher Copyright: {\textcopyright} 2022 Author(s).",
year = "2022",
month = jan,
day = "7",
doi = "10.1063/5.0064355",
language = "English",
volume = "131",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "1",
}