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Competition between superconductivity and magnetic/nematic order as a source of anisotropic superconducting gap in underdoped Ba1-xKxFe2As2

TitleCompetition between superconductivity and magnetic/nematic order as a source of anisotropic superconducting gap in underdoped Ba1-xKxFe2As2
Publication TypeJournal Article
Year of Publication2014
AuthorsKim, H, Tanatar, MA, Straszheim, WE, Cho, K, Murphy, J, Spyrison, N, Reid, JP, Shen, B, Wen, HH, Fernandes, RM, Prozorov, R
JournalPhysical Review B
Volume90
Pagination014517
Date Published07
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000339990000007
Keywordsiron-based superconductors, penetration depth
Abstract

0.25, and is accompanied by a rapid rise in the absolute value of Delta lambda(T) with underdoping. This effect, characteristic of the competition between superconductivity and other ordered states, is very similar to but of significantly smaller magnitude than what is observed in the electron-doped Ba(Fe1-xCox)(2)As-2 compounds. Our study suggests that the competition between superconductivity and magnetic/nematic order in hole-doped compounds is weaker than in electron-doped compounds, and that the anisotropy of the superconducting state in the underdoped iron pnictides is a consequence of the anisotropic changes in the pairing interaction and in the gap function promoted by both magnetic and nematic long-range orders.

DOI10.1103/PhysRevB.90.014517
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