Coexistence of magnetic fluctuations and superconductivity in the pnictide high temperature superconductor SmFeAsO1-xFx measured by muon spin rotation
Drew, Alan J.Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
Pratt, F. L.ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxfordshire, United Kingdom
Lancaster, T.Department of Physics, Clarendon Laboratory, Oxford University, Oxford, United Kingdom
Blundell, S. J.Department of Physics, Clarendon Laboratory, Oxford University, Oxford, United Kingdom
Baker, P. J.Department of Physics, Clarendon Laboratory, Oxford University, Oxford, United Kingdom
Liu, R. H.Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui, China
Wu, G.Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui, China
Chen, X. H.Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui, China
Watanabe, I.RIKEN-RAL, Nishina Centre, 2-1 Hirosawa, Wako, Saitama, Japan
Malik, Vivek KumarDepartment of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
Dubroka, AdamDepartment of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
Kim, Kyung WanDepartment of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
Rössle, MatthiasDepartment of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
Bernhard, ChristianDepartment of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
English
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 Λab(0)=190(5) nm was obtained, which confirms that the pnictide superconductors obey an Uemura-style relationship between Tc and Λab(0)⁻².