2011 Fiscal Year Final Research Report
Fundamental Studies on Transition Metal Compounds as Functional Materials by Magnetic Phasa Transition.
| Project/Area Number |
21560684
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical properties of metals
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| Research Institution | Shinshu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
NAKASHIMA Miho 信州大学, 理学部, 准教授 (80362614)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 電子 / 磁気物性 |
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| Research Abstract |
Magnetic properties for 3d-4d transition metal alloys,(Fe, Mn)(Rh, Pd) system and for Fe(Si, Ge) system were investigated by 57Fe Mossbauer effect measurements and magnetization measurements. A large magnetocaloric effect would be observed for the latter system by electronic structures calculations. For(Fe, Mn)(Rh, Pd) system, we obtained the magnetic phase diagram corresponding to the calculations. For Fe(Si, Ge) system, the obvious change of 57Fe Mossbauer spectra from Kondo insulator to ferromagnetic metal cannot be observed at a critical concentration x_c & sime ; 0.25. The 57Fe hyperfine fields for x=0.6 and 0.7 estimated by fitting of Mossbauer spectra at 80K are 6.0T and 8. 0T, respectively, while they are almost zero for 0≦x≦0. 5.
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