STRONG COUPLING EFFECTS IN HIGH-TC OXIDES FROM PARAMAGNONS

被引:0
|
作者
NICOL, EJ
CARBOTTE, JP
机构
[1] Physics Department, McMaster University, Hamilton
来源
PHYSICA C | 1991年 / 185卷
关键词
D O I
10.1016/0921-4534(91)90946-V
中图分类号
O59 [应用物理学];
学科分类号
摘要
While it is acknowledged, from both theoretical and experimental considerations, that the electron-phonon mechanism is not responsible for the superconductivity in the high-T(c) oxides, several experiments remain which exhibit strong-coupling effects. This paradox can be resolved by considering a mechanism for the high-T(c) oxides which is strong-coupling effects. This paradox can be resolved by considering a mechanism for the high-T(c) oxides which is mainly electronic in origin but with a small contribution from the electron-phonon interaction and a significant contribution from dynamic spin fluctuations, paramagnons. In such a model, strong coupling effects can arise from the paramagnons. Fixing the electron-phonon contribution to achieve an isotope effect coefficient of 0.05 at a T(c) of 96K, we can obtain a large gap ratio, 2-DELTA-o/k(B)T(c), a two-fluid model-like temperature dependence for the penetration depth, and a featureless optical conductivity, sigma-S/sigma-N, in agreement with interpretation of experiment.
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页码:1639 / 1640
页数:2
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