Magnetic and Transport Properties and Spin States of Layered Cobalt Oxides Sr_<2-x>Ho_xCoO_4 (0≤x≤1.0)(Spin, Orbital, Charge and Lattice Coupled Systems, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
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概要
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Layered cobalt oxides of Sr_<2-x>Ho_xCoO_4 (0≤x≤1.0) with square-lattice CoO_2 sheets (K_2NiF_4-type structure) were synthesized under high pressure and high temperature conditions. Ferromagnetism with Curie temperature T_C of〜255K was observed in the Sr_2CoO_4 compound. The Ho substitution effects on the magnetic and transport properties, and spin states of Co were systematically studied for the Sr_<2-x>Ho_xCoO_4 system. Large magnetore-sistance was also observed at both low temperatures and vicinity of T_C. Assessment of spin state for the Co^<3+> (produced by introduction of Ho^<3+> for Sr^<2+>) and Co^<4+> ions suggested that both are presented as intermediate-spin states.
- 理論物理学刊行会の論文
- 2005-10-31
著者
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Balamurugan Sarkarainadar
Superconducting Materials Center National Institute For Materials Science
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Takayama-muromachi Eiji
Superconducting Materials Center National Institute For Materials Science
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Muromachi Eiji
Superconducting Materials Center National Institute For Materials Science
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XU Mingxiang
Superconducting Materials Center, National Institute for Materials Science
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Xu Mingxiang
Superconducting Materials Center National Institute For Materials Science:state Key Laboratory Of Si
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XU Mingxiang
Superconducting Materials Center, National Institute for Materials Science:State Key Laboratory of Silicon Materials, Zhejiang University
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Balamurugan Sarkarainadar
Superconducting Materials Center, National Institute for Materials Science
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