NUCLEAR SPIN RELAXATION IN NORMAL AND SUPERCONDUCTING ALUMINUM
NUCLEAR SPIN RELAXATION IN NORMAL AND SUPERCONDUCTING ALUMINUM
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DOI：
10.1103/physrev.113.1504
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发表时间：
1959-01-01
期刊：
影响因子：
--
通讯作者：
SLICHTER, CP
中科院分区：
文献类型：
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作者：
HEBEL, LC;SLICHTER, CP
在0.94 ~ 4.2K温度范围内，测量了正常和超导Al的核自旋-晶格弛豫时间，以及在正常态下自旋-晶格弛豫时间随静磁场的变化。在正常状态下，弛豫速率与Redfield等人预测的温度成正比。场的依赖性比预期的要大一些。超导体中的弛豫是通过场循环方法研究的，这种方法允许在正常状态下进行测量，但弛豫发生在超导体中。结果不同意一个简单的双流体模型，但解释的理论，Barclay，库珀，和Schrieffer。核弛豫的温度依赖性与超声吸收之间的对比证实了Bardeen-Cooper-Schrieffer理论的中心特征，即自旋和动量相反的电子是相关的。
Nuclear spin-lattice relaxation times have been measured in normal and superconducting Al from 0.94 K to 4.2 K, and as a function of static field in the normal state. In the normal state the relaxation rate is proportional to temperature as predicted by Redfield and others. The field dependence is somewhat greater than predicted. Relaxation in the superconductor was studied by a field cycling method which allowed the measurements to be made in the normal state but relaxation to occur in the superconductor. The results disagree with a simple two-fluid model, but are explained by the theory of Bardeen, Cooper, and Schrieffer. The contrast between the temperature dependence of nuclear relaxation and ultrasonic absorption confirms the central feature of the Bardeen-Cooper-Schrieffer theory that electrons of opposite spin and momentum are correlated.