Minimization of temperature reached by adiabatic demagnetization refrigeration in Ce-based intermetallic Ce2(Cu1− xNix)2In

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Abstract
Magnetic entropy remaining near absolute zero temperature in the antiferromagnetic (AFM) critical state is expected to be usable for the cryogenic magnetic refrigeration. In this paper, we report quasi-adiabatic demagnetization refrigeration for Ce2(Cu1−xNix)2In (0≤x≤0.38) whose parent compound Ce2Cu2In orders antiferromagnetically below 6 K, by using a laboratory-made cell attachable to a commercial 4He refrigerator with a base temperature of 1.8 K. The final temperature by the quasi-adiabatic demagnetization as a function of x indicates a local minimum of 1 K at the AFM critical composition of x∼0.3. The validity of this result is confirmed by our specific-heat measurements. Our work motivates the future developments of Ce-based cryogenic magnetic refrigerants with the lower characteristic temperature in view of the low cost and easiness in synthesizing compared with Yb-based counterparts.
Funding Information
  • Fusion Oriented REsearch for disruptive Science and Technology (JPMJFR2233)
  • Japan Society for the Promotion of Science (JP18KK0078, JP18H01182, JP22K03529, 21K03473, 23H04866, 23H04870)
  • Hattori Hokokai Foundation (21-010)
  • The Mazda Foundation (21-KK191)
  • The Thermal and Electric Energy and Technology Foundation (007)
  • JGC-S Scholarship Foundation (2010)
  • Japan Society for the Promotion of Science (24H01673)

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