Magnetic Behavior of Mn3GaC under High Magnetic Field and High Pressure.

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  • Kamishima Kenji
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106
  • Bartashevich Mikhail I.
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106
  • Goto Tsuneaki
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106
  • Kikuchi Makoto
    Department of Applied Physics, Tohoku Gakuin University, Tagajo, Miyagi–ken 985
  • Kanomata Takeshi
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106

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  • Magnetic Behavior of Mn3GaC under High
  • Magnetic Behavior of Mn<sub><b>3</b></sub>GaC under High Magnetic Field and High Pressure

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Abstract

We have measured the magnetization and magnetostriction of Mn3GaC in pulsed high magnetic fields up to 37, T and the magnetization under steady magnetic field and pressure up to 0.82, GPa. Mn3GaC is antiferromagnetic (AF) at low temperatures. It exhibits successive transitions to an intermediate (I), to a ferromagnetic (F) and to a paramagnetic phase. The transition between the AF and I phases is first order and the others are second order. The transition temperature between the I and F phases does not change greatly with increasing magnetic field. At low temperatures, a metamagnetic transition from the AF to the I state is observed. Volume magnetostriction measurement at 4.2, K indicates that the volume is abruptly decreased by the metamagnetic transition and then gradually shrinks with increasing field. High pressure stabilizes the F phase and enhances the Mn moment.

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