Cobalt-doping effects in single crystalline and polycrystalline EuFe 2− x Co x As 2 compounds
Science China Physics, Mechanics and Astronomy(2010)
Abstract
A series of Co-doped EuFe 2− x Co x As 2 compounds were prepared in both of single crystalline and polycrystalline forms. The Co-doping effects on the crystal structure, electrical resistivity and magnetic susceptibility were systematically studied. Superconductivity was found in polycrystalline Co-doped samples from zero resistivity effects, with the highest onset superconducting transition temperature at 26 K in the optimum doped EuFe 1.84 Co 0.16 As 2 compound. While due to the stronger competition between the superconducting order and the Eu 2+ magnetic order, the zero resistivity effect is absent in the Co-doped single crystal samples.
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Key words
iron-pnictide,high-Tc,EuFe2As2,Co-doping,superconductivity
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