MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Magnetic Entropy Changes of SmMn2Ge2 under High Pressure
Keiichi KoyamaShihou MiuraHironari OkadaToru ShigeokaKazuo Watanabe
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2007 Volume 48 Issue 3 Pages 451-454

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Abstract

In order to obtain the information about magnetic states of reentrant ferromagnet, SmMn2Ge2, we have studied the pressure effect on magnetocaloric properties by magnetization measurements under high pressures up to 1.2 GPa in the temperature range from 5 to 300 K. Using the Maxwell relation, we estimated the magnetic entropy change |ΔSM| to be 0.65 JK−1mol−1 at T1 (=100 K) and 0.53 JK−1mol−1 at T2 (=150 K) under 0.1 MPa. By applying pressures up to 0.5 GPa, |ΔSM(T1)| is enhanced (2.0 JK−1mol−1), while |ΔSM(T2)| is slightly suppressed (0.4 JK−1mol−1). The obtained values of |ΔSM| were discussed on the basis of a mean field theory using a two-sublattice model.

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© 2007 The Japan Institute of Metals and Materials
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