MANY-BODY EFFECTS ON NUCLEAR-RELAXATION RATES IN SUPERCONDUCTING STATES OF COPPER OXIDES

被引:15
作者
FUJIMOTO, S
机构
[1] Department of Physics, Faculty of Science, Kyoto University
关键词
D O I
10.1143/JPSJ.61.765
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We investigate the effects of electron correlation on the nuclear spin-lattice relaxation rate (T1(-1)) and the Knight shift of high-T(c) superconductors. The main effects are a quasiparticle damping and the vertex enhancement of a spin susceptibility. The former involves a pair breaking effect induced by electron correlation, and brings about the suppression of the coherence peak. The latter is reduced by increasing gap below T(c), and results in the sharp decrease of T1(-1) and the Knight shift. Taking into account these effects, we fit the temperature dependence of these quantities to the experimental results by assuming s-wave or d-wave BCS-like superconductivity. For d-wave pairings, good fits can be obtained. In contrast, it is rather difficult to achieve a fit for s-wave pairings.
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页码:765 / 769
页数:5
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