Crystal Structural Phase Transition Induced by Magnetic Field
| Project/Area Number |
12640359
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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 |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | Keio University |
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Principal Investigator |
TAJIMA Keisuke Keio University, Science and Technology, Professor, 理工学部, 教授 (70004439)
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| Co-Investigator(Kenkyū-buntansha) |
WAKABAYASHI Nobuyoshi Keio University, Science and Technology, Professor (retired), 理工学部, 教授 (20146575)
SHIMOMURA Susumu Keio University, Science and Technology, Assistant Professor, 理工学部, 専任講師 (00260216)
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| Project Period (FY) |
2000 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2003: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2002: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
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| Keywords | itinerant electron magnetism / magnetic phase transition / magnetic phase diagram / X-ray diffraction / magnetovolume effect / flustration / metamagnetism / 希土類金属 / 四重極秩序 / X線回析 / ペロフスカイト化合物 / 遍歴電子磁性体 / マンガン酸化物 |
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| Research Abstract |
Magneto-volume effect in itinerant electron metamagnetic system has been investigated by means of x-ray diffraction under magnetic field and magnetization measurements. Results are compared with those in the localized spin system and characteristic properties in an itinerant system can be discussed.
1) The magnetovolume effect in Laves phase compound Lu(CoGa)_2 which is known as a typical itinerant electron system has been investigated. Results can be well interpreted by the spin fluctuation theory.
2) The first order magnetic phase transition in (FeMn)_2P is also described by the itinerant electron metamagnetic transition which is due to the interaction between two magnetic sub-bands. Results of the measurement for magnetovolume effect suggest that the band structure of paramagnetic and ferromagnetic states is different, which are expected to extend the theoretical understanding itinerant electron metamagnetism in this material.
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Report
(5 results)
Research Products
(18 results)
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[Publications] S.Shimomura, T.Tozegawa, K.Tajima, N.Wakabayashi, N.Ikeda, T.Shobu, Y.Noda, T.Tomioka, Y.Tokura: "X-ray diffuse scattering study on charged-localized states of Pr_<1-x>Ca_xMnO_3 (x=0.35, 0.4, 0.5)"Phys.Rev.. B62. 3875-3878 (2000)
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