Ferromagnetic and Triplet-Pairing Instabilities Controlled by Trigonal Distortion of CoO_6 Octahedra in Na_xCoO_2・yH_2O(Condensed Matter : Structure, Mechanical and Thermal Properties)
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概要
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In the recently discovered Co-oxide superconductor Na_xCoO_2・yH_2O, the edge-shared CoO_6 octahedra are trigonally contracted along the c-axis in the CoO_2-plane. We study how this CoO_6 distortion affects the magnetic properties and superconductivity in this compound by analyzing the multiorbital Hubbard model using the fluctuation-exchange approximation. It is shown that through generating the trigonal crystal field, the distortion pushes the Co e′_g bands up and consequently gives rise to the hole-pocket Fermi surfaces, which have been predicted in the band calculations. As the distortion increases, the hole pockets are enlarged and the ferromagnetic fluctuation as well as the pairing instability increases, which is in good agreement with recent NQR results.
- 社団法人日本物理学会の論文
- 2005-06-15
著者
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OGATA Masao
Department of Physics, University of Tokyo
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YANASE Youichi
Department of Physics, University of Tokyo
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Yanase Y
Department Of Physics University Of Tokyo
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Yanase Youichi
Department Of Physics Kyoto University:(present)department Of Physics University Of Tokyo
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Yanase Youichi
Department Of Physics Kyoto University
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MOCHIZUKI Masahito
Department of Physics, University of Tokyo
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Ogata Masao
Department Of Basic Science Graduate School Of Arts And Sciences The University Of Tokyo
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Mochizuki M
Department Of Physics University Of Tokyo
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Mochizuki Masahito
Department Of Manufacturing Science Graduate School Of Engineering Osaka University
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Ogata Masao
Department Of Basic Science Graduate School Of Arts And Science University Of Tokyo
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Mochizuki Masahito
Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
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