Ytterbium-based heavy-fermion metals have recently attracted attention as magnetic refrigeration materials generating low-temperature environments below 1 K without using expensive . is known to exhibit a giant value of specific heat divided by temperature 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 ingots installed in a commercial refrigerator. The performance is consistent with that evaluated by our DC magnetization and specific heat measurements. Our study demonstrates the high performance of without precious metals as a magnetic refrigeration material with moderately high density of Yb atoms () and high thermal conductivity.
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