| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2011: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Research Abstract |
An isomorphic phase transition in MnAu4 ordered alloy has been observed at the transition pressure Pc=10 GPa at room temperature for the first time. Although the crystal symmetry is kept the MoNi4-type superlattice over the measured pressure up to 20 GPa, the pressure effect on Au magnetic moment changes a sign from positive to negative around Pc, and the elastic properties, e.g. compressibility, c/a ratio, bulk modulus, are also clearly modified. These peculiar phenomena should be ascribed to a strong magneto-elastic interaction of Mn(3d)-Au(5d) electrons and a rotational displacement of Au atoms under high pressure.
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