title: Superconductivity at 56 K in samarium-doped SrFeAsF.
abstract: We synthesized the samples Sr(1-x)Sm(x)FFeAs with a ZrCuSiAs-type structure. These samples were characterized by resistivity and susceptibility. It is found that substitution of rare earth metal for alkaline earth metal in this system suppresses the anomaly in resistivity and induces superconductivity. Superconductivity at 56 K in nominal composition Sr(0.5)Sm(0.5)FFeAs is realized, indicating that the superconducting transition temperatures in the iron arsenide fluorides can reach as high as that in oxypnictides with the same structure.
authors.affiliation: Hefei National Laboratory for Physical Science at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China. Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
authors.forename: G
authors.initials: G
authors.lastname: Wu
authors.forename: Y L
authors.initials: YL
authors.lastname: Xie
authors.forename: H
authors.initials: H
authors.lastname: Chen
authors.forename: M
authors.initials: M
authors.lastname: Zhong
authors.forename: R H
authors.initials: RH
authors.lastname: Liu
authors.forename: B C
authors.initials: BC
authors.lastname: Shi
authors.forename: Q J
authors.initials: QJ
authors.lastname: Li
authors.forename: X F
authors.initials: XF
authors.lastname: Wang
authors.forename: T
authors.initials: T
authors.lastname: Wu
authors.forename: Y J
authors.initials: YJ
authors.lastname: Yan
authors.forename: J J
authors.initials: JJ
authors.lastname: Ying
authors.forename: X H
authors.initials: XH
authors.lastname: Chen