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
Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Chemin du Musee 3, CH-1700 Fribourg, Switzerland.
Phys Rev Lett. 2008 Aug 29;101(9):097010. doi: 10.1103/PhysRevLett.101.097010.
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).
对x = 0.18和0.3的铁基高温超导体SmFeAsO1 - xFx进行了μ子自旋旋转实验。我们观察到在超导转变附近慢自旋涨落出现异常增强，这表明自旋涨落有助于形成非传统超导态。得到了面内穿透深度λab(0)=190(5) nm的估计值，这证实了铁基超导体符合Tc与λab(0)之间的Uemura型关系；(-2)。
