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A Yb-based intermetallic compound YbCo2 exhibiting a magnetic-field-induced order is known to show a giant specific heat divided by temperature, C/T ~ 6.5 J/K2 mol, around 0.3 K. We investigate the potential of this substance as the magnetic refrigerants by measuring the thermodynamic properties down to 0.1 K. The entropy change per volume by applying magnetic field of 3 T is found to be -Delta_S_M ~ 0.15 J/K cm3 around 1K. This value is particularly large in the Yb-based metallic magnetic refrigerants to provide the sub-Kelvin temperature. In addition,
we demonstrate that a 2.2 g sample is cooled down to 0.26 K by the adiabatic demagnetization refrigeration from 1.8 K and 12 T. This cooling performance is attributed to the ground state, at zero field, locating around the boundary between the field-induced ordered phase and the paramagnetic one. Our study clarifies the utility of the sub-Kelvin magnetic refrigerants, which combine the large Delta_S_M and the high thermal conductivity of metal.

権利情報:

• In Copyright
  

  This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yasuyuki Shimura, Ryoma Yokoo, Kanta Watanabe, Hiroto Furuie, Naohito Tsujii, Kazunori Umeo, Takahiro Onimaru; YbCo2: Large magnetic entropy change per volume in Yb-based metallic magnetic refrigerants for sub-Kelvin temperature. Appl. Phys. Lett. 8 September 2025; 127 (10): 102403 and may be found at https://doi.org/10.1063/5.0287094.

キーワード: YbCo2, Yb compounds, Magnetic entropy, Heavy Fermion

刊行年月日: 2025-09-08

出版者: AIP Publishing

掲載誌:

• Applied Physics Letters (ISSN: 00036951) vol. 127 issue. 10 102403

研究助成金:

• Fusion Oriented REsearch for disruptive Science and Technology JPMJFR2233
• Japan Society for the Promotion of Science JP22K03529
• Japan Society for the Promotion of Science 23H04866
• Japan Society for the Promotion of Science 23H04870
• Japan Society for the Promotion of Science and 24K21692
• Kyoto Technoscience Center 8
• Mazda Foundation 21KK-191

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5939

公開URL: https://doi.org/10.1063/5.0287094

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更新時刻: 2025-11-28 16:30:19 +0900

MDRでの公開時刻: 2025-11-28 16:21:59 +0900