Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 466, Issue 1-2, Pages 131-141Publisher
ELSEVIER
DOI: 10.1016/j.physc.2007.07.003
Keywords
type-II superconductors; mixed state; unconventional superconductivity; Muon-spin-rotation experiments; magnetic field penetration depth
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We argue that claims about magnetic field dependence of the magnetic field penetration depth lambda, which were made on the basis of muon-spin-rotation (mu SR) studies of some superconductors, originate from insufficient accuracy of theoretical models employed for the data analysis. We also reanalyse some of already published experimental data and demonstrate that numerical calculations of Brandt [E.H. Brandt, Phys. Rev. B 68 (2003) 54506] may serve as a reliable and powerful tool for the analysis of mu SR data collected in experiments with conventional superconductors. Furthermore, one can use this approach in order to distinguish between conventional and unconventional superconductors. It is unfortunate that these calculations have practically never been employed for the analysis of mu SR data. (c) 2007 Elsevier B.V. All rights reserved.
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