Journal
COMPTES RENDUS PHYSIQUE
Volume 12, Issue 5-6, Pages 502-514Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crhy.2011.03.001
Keywords
Iron-based superconductors; Iron-pnictide superconductors; Gap structure; Magnetic penetration depth
Funding
- UK EPSRC
- EPSRC [EP/H025855/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H025855/1] Funding Source: researchfish
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This article reviews experiments to determine the structure of the superconducting gap in the iron-based superconductors. It focuses on insights provided by measurements of the temperature dependence of magnetic penetration depth but also discusses the information provided by other measurements especially thermal conductivity. The article includes background theory on the types of gap structure suggested for the iron-based superconductors as well as the general theory of penetration depth in conventional and unconventional superconductors. The effect of impurity scattering on each candidate gap structure is important for the interpretation of data and so will also be discussed. Penetration depth data for single crystals of the following compounds is reviewed: SmFeAsO0.8F0.2, FeTe0.5Se0.5, LaFePO, KFe2As2 and BaFe2(As0.67P0.33)(2) along with discussion on related materials such as K- and Co-doped BaFe2As2. (c) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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