EFFECT OF SUPERCONDUCTIVITY FLUCTUATIONS ON THE NMR RELAXATION RATE OF HIGH-T(C) SUPERCONDUCTORS

被引：3
|
作者：
APPEL, J [1 ]
FAY, D [1 ]
KAUTZ, C [1 ]
机构：
[1] INST ANGEW PHYS,THEORET FESKORPERPHYS ABT,D-20355 HAMBURG,GERMANY
来源：
JOURNAL OF SUPERCONDUCTIVITY | 1994年 / 7卷 / 03期
关键词：
SUPERCONDUCTIVITY; FLUCTUATIONS; NMR; SPIN RELAXATION; HIGH T(C);
D O I：
10.1007/BF00728468
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The effect of superconducting order parameter fluctuations on the nuclear-spin relaxation rate, 1/T1, is studied for clean two-dimensional systems by calculating the three Maki-Thomson-type diagrams which represent the lowest-order fluctuation contributions to the transverse susceptibility. For Gaussian fluctuations and for temperatures near the mean field transition temperature, T(c0), we employ a weak-coupling theory in which the pair-fluctuation propagator can also include pair-breaking effects. We also go beyond the Gaussian theory and take into account the interactions between Cooper-pair fluctuations corresponding to the fourth-order Ginzburg-Landau fluctuation terms. We compare our results with previous results in the dirty limit and in 3D. We obtain a pronounced peak in 1/T1 at T(c) and briefly discuss possible reasons why this peak is not observed.
引用
收藏
页码：607 / 611
页数：5
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