Magnetostriction of SmMn2Ge2 and GdMn2Ge2 intermetallic compounds |
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Authors: | Guo Guanghua R Z Levitin V V Snegirev D V Filippov |
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Institution: | (1) Moscow State University, Vorob’evy gory, Moscow, 119899, Russia |
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Abstract: | Longitudinal and transverse magnetostrictions of polycrystalline samples of intermetallic compounds RMn2Ge2 (R=Sm or Gd) are measured in pulsed magnetic fields up to 250 kOe. It is found that linear magnetostrictive strains of about 10?3 arise in a temperature range in which the magnetic field causes a change in the magnetic state of a manganese magnetic subsystem. The results obtained are described within the model of a two-sublattice ferrimagnet with a negative exchange interaction in the manganese subsystem in terms of a strong dependence of this interaction on interatomic distances. |
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