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Evidence for coexistence of superconductivity and magnetism in single crystals of Co-doped SrFe(2)As(2). 2009
Jun Sung Kim, and
Seunghyun Khim, and
Liqin Yan, and
N Manivannan, and
Yong Liu, and
Ingyu Kim, and
G R Stewart, and
Kee Hoon Kim
CSCMR and FPRD, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea.
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.
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