Many-Body Effects on Nuclear Relaxation Rates in Superconducting States of Copper Oxides
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概要
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We investigate the effects of electron correlation on the nuclear spin-lattice relaxa-tion rate (T7 ') and the Knight shift of high-7'. superconductors. The main effects area quasiparticle damping and the vertex enhancement of a spin susceptibility. Theformer involves a pair breaking effect induced by electron correlation, and bringsabout the suppression of the coherence peak. The latter is reduced by increasing gapbelow T., and results in the sharp decrease of T f' and the Knight shift. Taking intoaccount these effects, we fit the temperature dependence of these quantities to the ex-perimental results by assuming .s'-wave or d-wave BCS-lilce superconductivity. Ford-wave pairings, good fits can be o btained. In contrast, it is rather difficult to achievea fit for ,s'-wave pairings.
- 一般社団法人日本物理学会の論文
- 1992-03-15
著者
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Fujimoto Satoshi
Department Of Hygiene And Microbiology Faculty Of Veterinary Medicine Hokkaido University
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Fujimoto Satoshi
Department of Physics,Faculty of Science,Kyoto University
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