Pressure effects on magnetic and elastic properties in Au4Mn ordered alloy
| Project/Area Number |
23560788
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Physical properties of metals
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| Research Institution | Hiroshima University |
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Principal Investigator |
MARUYAMA Hiroshi 広島大学, 理学(系)研究科(研究院), 教授 (20181836)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| 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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| Keywords | 高圧物性 / 同型相転移 / 磁気・弾性効果 / Mnベース遍歴磁性体 / X線磁気円二色性 / 高圧下電気抵抗測定 / 高温高圧下電気抵抗測定 / 電気抵抗 / 高温高圧 / 磁気相転移 / 磁気モーメント / 正の圧力効果 |
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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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Report
(4 results)
Research Products
(8 results)
