Fluctuation-induced diamagnetism and dimensionality in superconducting layered compounds: and Nb
- 1 June 1977
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 15 (11) , 5245-5261
- https://doi.org/10.1103/physrevb.15.5245
Abstract
The results of an investigation of fluctuation-induced diamagnetism in superconducting layered compounds are presented. These results are used to establish the dimensionality of the superconducting fluctuation effects near . Compounds studied include the intercalated compound , and unintercalated Nb and Ta . The susceptibility above , and magnetization in the superconducting state, were measured in fields up to 327 Oe with a superconducting quantum-interference magnetometer suitable for a broad range of sensitive magnetic measurements. The operation and performance of this magnetometer are described. Results for indicate that in low fields and near , the fluctuation effects are three-dimensional in nature, where this is established via a comparison with previous results for an isotropic alloy, Pb-5-at.% Tl. This conclusion as to the dimensionality of the superconducting effects is in accord with the qualitative predictions of the Lawrence-Doniach theory for weakly-coupled superconducting layers. Data for Nb have a number of complicating features, and firm conclusions regarding this material could not be drawn.
Keywords
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