Physics – Condensed Matter – Superconductivity
Scientific paper
2008-05-07
Physics
Condensed Matter
Superconductivity
To appear in Physical Review Letters. Changes to title, figures 1 and 4, references and (minor changes to) the text
Scientific paper
10.1103/PhysRevLett.101.097010
Muon-spin rotation experiments were performed on the pnictide high temperature superconductor SmFeAsO$_{1-x}$F$_{x}$ with x=0.18 and 0.3. We observed an unusual enhancement of slow spin fluctuations in the vicinity of the superconducting which suggests that the spin fluctuations contribute to the formation of an unconventional superconducting state. An estimate of the in-plane penetration depth $\lambda_{ab}(0)=190(5)$\thinspace nm was obtained, which confirms that the pnictide superconductors obey an Uemura-style relationship between $T_{\mathrm{c}}$ and $\lambda_{ab}(0)^{-2}$.
Baker Peter J.
Bernhard Christian
Blundell Stephen J.
Chen Hua-Xing
Drew Alan J.
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