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Kim, Jun Sung,Khim, Seunghyun,Yan, Liqin,Manivannan, N,Liu, Yong,Kim, Ingyu,Stewart, G R,Kim, Kee Hoon IOP Pub 2009 Journal of Physics, Condensed Matter Vol.21 No.10
<P>In order to investigate whether magnetism and superconductivity coexist in Co-doped SrFe<SUB>2</SUB>As<SUB>2</SUB>, we have prepared single crystals of SrFe<SUB>2−<I>x</I></SUB>Co<SUB><I>x</I></SUB>As<SUB>2</SUB>, <I>x</I> = 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 <I>x</I> = 0.4, there is both magnetic and resistive evidence for a spin density wave transition at 120 K, while <I>T</I><SUB>c</SUB> = 19.5 K—indicating coexistent magnetism and superconductivity. A discussion of how these results compare with reported results, both in SrFe<SUB>2−<I>x</I></SUB>Co<SUB><I>x</I></SUB>As<SUB>2</SUB> and in other doped 122 compounds, is given. </P>