Dynamical Spin Susceptibility of Electron-Doped High-$T_{\text{c}}$ Cuprates —Comparison with Hole-Doped Systems—
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概要
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The magnetic excitation spectrum of electron-doped copper oxide superconductors is studied by calculating the dynamical spin susceptibility of the two-dimensional Hubbard model in which a $d_{x^{2}-y^{2}}$-wave superconducting order parameter is assumed. The spectrum of electron-doped systems is compared with that of hole-doped systems, and the relationship between the frequency at which a peak grows in the spectrum and the superconducting energy gap at a hot spot is investigated. A peak may be observed even when the magnetic resonance condition is not exactly satisfied. We find that, in the electron-doped systems, the resonance condition is less likely to be satisfied than in the hole-doped systems because of the small density of states around the hot spots, and the peak frequency is close to twice the gap magnitude at the hot spots.
- Physical Society of Japanの論文
- 2010-02-15
著者
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Mutou Tetsuya
Interdisciplinary Faculty of Science and Engineering, Shimane University, Matsue 690-8504, Japan
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Hirashima Dai
Department of Material Science, International Christian University, Mitaka, Tokyo 181-8585, Japan
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Suzuki Atsuo
Interdisciplinary Faculty of Science and Engineering, Shimane University, Matsue 690-8504, Japan
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Tanaka Syunsuke
Department of Physics, Nagoya University, Nagoya 464-8602, Japan
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