Electron-Phonon Mechanism for Superconductivity in Na_<0.35>CoO_2 : Valence-Band Suhl-Kondo Effect Driven by Shear Phonons (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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To study the possible mechanism of superconductivity in Na_<0.35>CoO_2, we examine the interaction between all the relevant optical phonons (breathing and shear phonons) and t_<2g> (a_<1g>+e'_g) electrons of Co ions, and study the transition temperature for s-wave superconductivity. The obtained T_c is very low when the e'_g valence bands are far below the Fermi level. However, T_c is strongly enhanced when the top of the e'_g valence bands is close to the Fermi level (e.g., -50meV), thanks to the interband hopping of Cooper pairs caused by shear phonons. This "valence-band Suhl-Kondo mechanism" due to shear phonons is important in understanding the superconductivity in Na_<0.35>CoO_2. By the same mechanism, the kink structure of the band dispersion observed by angle-resolved photoemission spectroscopy (ARPES) measurements, which indicates the strong mass enhancement (m*/m〜3) due to optical phonons, is also explained.
- 社団法人日本物理学会の論文
- 2006-03-15
著者
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KONTANI Hiroshi
Department of Physics, Nagoya University
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Kontani Hiroshi
Nagoya Univ. Nagoya
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YADA Keiji
Department of Physics, Nagoya University
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Yada Keiji
Department Of Physics Nagoya University
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Kontani Hiroshi
Department Of Physcis Kyoto University
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