Abstract
Polycrystalline SmMn2Ge2 has been prepared by arc melting method. Large magnetic entropy changes of −3.7 and 3.3J∕kgK are found under a low magnetic field change of 5kOe, near two first-order transition temperatures, T1(112K) and T2(152K), respectively. The coexistence of the large low-field positive and negative magnetic entropy change suggests a potential of SmMn2Ge2 as a magnetic refrigerant in the corresponding temperature range.
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