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Original article (peer-reviewed)

Journal SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume (Issue) 28(3)
Page(s) 034003
Title of proceedings SUPERCONDUCTOR SCIENCE & TECHNOLOGY
DOI 10.1088/0953-2048/28/3/034003

Abstract

Muon-spin rotation (mu SR) was demonstrated to be a good tool to investigate the temperature and the magnetic field dependence of the superfluid density in the bulk of a superconductor which, within the framework of certain models, allows to determine the energy gap structure as well as to obtain the absolute gap values. In this review paper we present the results of mu SR studies of various compounds belonging to the so called `11' and `122' families of Fe-based high temperature superconductors (Fe-HTSs). The existence of multiple superconducting energy gaps is confirmed by occurence of an inflection point in the temperature dependence of the superfluid density curve. Experiments on the single crystalline samples reveal that the penetration depth anisotropy gamma(lambda) show an opposite temperature evolution as the upper critical field anisotropy gamma H-c2. This resembles the situation in `architectural' two-gap superconductor MgB2 and confirms the existence of multiple energy gaps in the energy spectra of Fe-HTSs.
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