Coexistence of magnetic fluctuations and superconductivity in the pnictide high temperature superconductor SmFeAsO1-xFx measured by muon spin rotation

Muon spin rotation experiments were performed on the pnictide high temperature superconductor SmFeAsO1-xFx with x=0.18 and 0.3. We observed an unusual enhancement of slow spin fluctuations in the vicinity of the superconducting transition which suggests that the spin fluctuations contribute to the f...

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Published inPhysical review letters Vol. 101; no. 9; p. 097010
Main Authors Drew, A J, Pratt, F L, Lancaster, T, Blundell, S J, Baker, P J, Liu, R H, Wu, G, Chen, X H, Watanabe, I, Malik, V K, Dubroka, A, Kim, K W, Rössle, M, Bernhard, C
Format Journal Article
LanguageEnglish
Published United States 29.08.2008
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Summary:Muon spin rotation experiments were performed on the pnictide high temperature superconductor SmFeAsO1-xFx with x=0.18 and 0.3. We observed an unusual enhancement of slow spin fluctuations in the vicinity of the superconducting transition which suggests that the spin fluctuations contribute to the formation of an unconventional superconducting state. An estimate of the in-plane penetration depth lambda ab(0)=190(5) nm was obtained, which confirms that the pnictide superconductors obey an Uemura-style relationship between Tc and lambda ab(0);(-2).
ISSN:0031-9007
DOI:10.1103/PhysRevLett.101.097010