Calculation of the Effect of Random Superfluid Density on the Temperature Dependence of the Penetration Depth

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Description

Microscopic variations in composition or structure can lead to nanoscale inhomogeneity in superconducting properties such as the magnetic penetration depth, but measurements of these properties are usually made on longer length scales. We solve a generalized London equation with a non-uniform penetration depth {lambda}(r), obtaining an approximate solution for the disorder-averaged Meissner screening. We find that the effective penetration depth is different from the average penetration depth and is sensitive to the details of the disorder. These results indicate the need for caution when interpreting measurements of the penetration depth and its temperature dependence in systems which may be inhomogeneous.

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19 pages

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Lippman, Thomas & Moler, Kathryn A. July 20, 2012.

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Description

Microscopic variations in composition or structure can lead to nanoscale inhomogeneity in superconducting properties such as the magnetic penetration depth, but measurements of these properties are usually made on longer length scales. We solve a generalized London equation with a non-uniform penetration depth {lambda}(r), obtaining an approximate solution for the disorder-averaged Meissner screening. We find that the effective penetration depth is different from the average penetration depth and is sensitive to the details of the disorder. These results indicate the need for caution when interpreting measurements of the penetration depth and its temperature dependence in systems which may be inhomogeneous.

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19 pages

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  • Journal Name: Submitted to Physical Review B; Journal Volume: 85; Journal Issue: 10

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  • Report No.: SLAC-PUB-14884
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevB.85.104529 | External Link
  • Office of Scientific & Technical Information Report Number: 1046371
  • Archival Resource Key: ark:/67531/metadc830737

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  • July 20, 2012

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • June 20, 2016, 8:58 p.m.

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Lippman, Thomas & Moler, Kathryn A. Calculation of the Effect of Random Superfluid Density on the Temperature Dependence of the Penetration Depth, article, July 20, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc830737/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.