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Magnetic properties and magnetocaloric effects of Mn5Ge2.7M0.3 (M=Ga, Al, Sn) compounds

Shen Bao-Gen Liu Xi-Bin

Magnetic properties and magnetocaloric effects of Mn5Ge2.7M0.3 (M=Ga, Al, Sn) compounds

Shen Bao-Gen, Liu Xi-Bin
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  • Received Date:  08 June 2005
  • Accepted Date:  29 July 2005
  • Published Online:  20 December 2005

Magnetic properties and magnetocaloric effects of Mn5Ge2.7M0.3 (M=Ga, Al, Sn) compounds

  • 1. (1)中国科学院物理研究所磁学国家重点实验室,北京 100080; (2)中国科学院物理研究所磁学国家重点实验室,北京 100080;中国人民武装警察部队学院基础部, 廊坊 065000

Abstract: The magnetic properties and magnetocaloric effects of Mn5Ge2.7M0.3(M=Ga, Al, Sn) compounds have been studied. All samples crystallize in the hexagonal Mn5Si3-type structure with space group P63/mcm. The average Mn magnetic moment decreases and the Curie temperature remains almost unchanged by the substitution of M for Ge. The magnetic entropy changes in these compounds are determined from the temperature and field dependence of the magnetization using the thermodynamic Maxwell relation. The substitution of M for Ge reduces the magnitude of the magnetic entropy change owing to the decrease of the magnetic moment but broadens the magnetic entropy change peak. The maximum magnetic entropy changes for a field changes of 4.0×106A·m-1 are 6.1, 6.3, and 5.3J·kg-1K-1 for M=Ga, Al, and Sn, respectively. In addition, anomalies are found in the Arrott curves of Mn5Ge2.7M0.3(M=Ga Al, Sn) compounds under a critical field Hc when the temperature is higher than the Curie temperature TC, which indicates that the paramagnetic susceptibilities of these compounds change sharply. The value of Hc increases almost linearly with increasing temperature. This phenomenon is probably due to the change of Fermi energy by the applied magnetic field, which reduces the number of the effective charges.

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