title: Evidence for coexistence of superconductivity and magnetism in single crystals of Co-doped SrFe(2)As(2).
abstract: In order to investigate whether magnetism and superconductivity coexist in Co-doped SrFe(2)As(2), we have prepared single crystals of SrFe(2-x)Co(x)As(2), x = 0 and 0.4, and characterized them via x-ray diffraction, electrical resistivity in zero and applied field up to 9 T as well as at ambient and applied pressure up to 1.6 GPa, and magnetic susceptibility. At x = 0.4, there is both magnetic and resistive evidence for a spin density wave transition at 120 K, while T(c) = 19.5 K-indicating coexistent magnetism and superconductivity. A discussion of how these results compare with reported results, both in SrFe(2-x)Co(x)As(2) and in other doped 122 compounds, is given.
authors.affiliation: CSCMR and FPRD, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea.
authors.forename: Jun Sung
authors.initials: JS
authors.lastname: Kim
authors.forename: Seunghyun
authors.initials: S
authors.lastname: Khim
authors.forename: Liqin
authors.initials: L
authors.lastname: Yan
authors.forename: N
authors.initials: N
authors.lastname: Manivannan
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.forename: Ingyu
authors.initials: I
authors.lastname: Kim
authors.forename: G R
authors.initials: GR
authors.lastname: Stewart
authors.forename: Kee Hoon
authors.initials: KH
authors.lastname: Kim