1998 Fiscal Year Final Research Report Summary
QUANTUM EFFECT IN MAGNETISM
| Project/Area Number |
09044084
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Field |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | Oska University |
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Principal Investigator |
MIYAKO Yoshihito Graduate School of Science, Osaka University Professor, 大学院・理学研究科, 教授 (10000837)
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| Co-Investigator(Kenkyū-buntansha) |
MYDOSH J.A. Kamerlingh Onnes Laboratorium der rijksuniversiteit te Leiden, Professor, オネス研究所, 教授
HAMMANN J.M. Service de Physique del'Etat Condense, Director, サックレー固体物理学研究所, 所長
KAWARAZAKI Shuzo Graduate School of Science, Osaka University, Professor, 大学院・理学研究科, 教授 (40028262)
MIYAKE Kazumasa Faculty of Engineering Science, Osaka University, Professor, 基礎工学部, 教授 (90109265)
AKAI Hisazumi Graduate School of Science, Osaka University, Professor, 大学院・理学研究科, 教授 (70124873)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Heavy Electron / Kondo Effect / Non-Fermi Liquid / Spin Density Wave |
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| Research Abstract |
Magnetism of Ce and U intermetallic compounds were investigated focused on quantum effects.
(1)Spin-lattice coupling was studied on Ce(Ru_<085>Rh_<015>)_2Si_2 and U_2Rh_3Si_5 by mens of thermal expansion and magnetostriction. 4f^1 electron of Ce ion in Ce(Ru_<085>Rh_<015>)_2Si_<2 > changes from localized to itinerant state due to Kondo effect. The change of electronic state induces volume change. Such a volume change is interpreted as an INVAR like effect in heavy fermion system.
(2) Magnetism of tiny moment in UPt_3 and URu_2Si_2 were studied theoretically.
(3)Stability of ferromagnetism in (In, Mn)As semiconductor was studied.
(4)There are 3 critical boundaries between antiferromagnetic and paramagnetic states which are at x = 0.03, 0.4 and 0.5 in Ce(Ru1_<1-X>Rh_X)_2Si_2. Fermi and non-Fermi liquid behaviors appear at the lowest temperatures for x = 0.03 and for x = 0.4 and 0.5, respectively. These behaviors were studied by muSR and a magneitc phase transition at T = 0 is suggested for x = 0.03 while , for x = 0.4 and 0.5, a Griffiths like phase is proposed which has a negative T_N.
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