Static Spin Susceptibility with Anisotropic Superconducting Gap Parameter in High-T_c Cu Oxides
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概要
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The wave-number dependent BCS spin susceptibility X(q) with various-type anisotropic superconducting gap parameters Δ(q) is calculated for a two dimensional nearly antiferromagnetic Fermi liquid model with the random-phase-approximation (RPA). The Δ(q) anisotropic but gapful on the Fermi surface gives rise to a significant reduction of X(q) around q=Q[=(π, π)]. The enhanced X(q〜Q) below T_c as large as above T_c can be traced to the d (x^2-y^2)-wave gap parameter or the nodeless anisotropic gap parameter with the specific minimum gap, Δ_<min> (0.35<2Δ_<min>/k_BT_c<0.7), on the Fermi surface. From the experimental findings on the enhanced X(q〜Q) below T_c and the anisotropic Δ(q) on the Fermi surface for the high-T_c Cu oxides, we conclude that the d(x^2-y^2)-wave gap parameter is realized but not the other types in the high-T_c superconductivity, except the additional change of the order parameter.
- 社団法人日本物理学会の論文
- 1995-01-15
著者
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Itoh Yutaka
Department Of Chemistry Graduate School Of Science Kyoto University
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Itoh Yutaka
Department Of Physics Faculty Of Science Kochi University
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