Developments of the Yb-Based Magnetic Refrigerants for Cooling Down below 1 K / イッテルビウム化合物を用いた1K以下の極低温生成のための磁気冷凍材料の開発
- Resource Type
- Journal Article
- Authors
- Yasuyuki Shimura; Yoshifumi Tokiwa; 常盤 欣文; 志村 恭通
- Source
- 日本物理学会誌 / Butsuri. 2023, 78(8):461
- Subject
- Language
- Japanese
- ISSN
- 0029-0181
2423-8872
Low temperatures below 1 K are much more easily achieved by magnetic refrigeration because of the simple construction, compared to the mainstream 3He–4He dilution refrigeration technique. Ytterbium (Yb)-based compounds with a giant specific heat around 0.1 K have attracted much attention as magnetic refrigerants. We measured thermodynamic properties and demonstrated the magnetic refrigeration down to well below 1 K by switching off the magnetic field applied for the sample in the quasi-adiabatic environments. We show that geometrical frustration or heavy mass of electrons play the crucial roles in the refrigeration.