s or d(xy) Wave Superconducting Gap Created from the Electron-Phonon : Coupled States in Underdoped La_<2-x>Sr_xCuO_4(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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In La_<2-x>Sr_xCuO_4 the superconducting gap energy in the B_<2g> Raman spectra is almost constant from the optimum doping to near the insulator-metal (I-M) transition, indicating that the gap symmetry is s or d(xy), because the Fermi arc shrinks into the nodal direction of the d(x^2-y^2) gap. The reason of the different result from other experiments comes from the dual components of the low-energy electronic states around (π/2, π/2), the resonant peak relating to the I-M transition and the polaron states. The superconducting coherent peak is found to be created only in the polaron states in the underdoped phase.
- 社団法人日本物理学会の論文
- 2008-03-15
著者
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Sugai Shunji
Department Of Physics Division Of Material Science Nagoya University
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TAKAYANAGI Yasumasa
Department of Physics, Faculty of Science, Nagoya University
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HAYAMIZU Naoki
Department of Physics, Faculty of Science, Nagoya University
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MUROI Tsuyoshi
Department of Physics, Faculty of Science, Nagoya University
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Hayamizu Naoki
Department Of Physics Faculty Of Science Nagoya University
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Muroi Tsuyoshi
Department Of Physics Faculty Of Science Nagoya University
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Takayanagi Yasumasa
Department Of Physics Faculty Of Science Nagoya University
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