Possible superconductivity above 25 K in single crystalline Co-doped BaFe$_{2}$As$_{2}$

Details Possible superconductivity above 25 K in single crystalline Co-doped BaFe$_{2}$As$_{2}$ Possible superconductivity above 25 K in single crystalline Co-doped BaFe$_{2}$As$_{2}$

2008-11-17

arxiv.org/abs/0811.2621v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1143/JPSJ.78.023702

We present superconducting properties of single crystalline Ba(Fe$_{0.9}$Co$_{0.1}$)$_{2}$As$_{2}$ by measuring magnetization, resistivity, upper critical field, Hall coefficient, and magneto-optical images. The magnetization measurements reveal fish-tail hysteresis loop at high temperatures and relatively high critical current density above $J_{c}=10^{5}$ A/cm$^{2}$ at low temperatures. Upper critical field determined by resistive transition is anisotropic with anisotropic parameter $\sim$ 3.5. Hall effect measurements indicate that Ba(Fe$_{0.9}$Co$_{0.1}$)$_{2}$As$_{2}$ is a multiband system and the mobility of electron is dominant. The magneto-optical imaging reveals prominent Bean-like penetration of vortices although there is a slight inhomogeneity in a sample. Moreover, we find a distinct superconductivity above 25 K, which leads us to speculate that higher transition temperature can be realized by fine tuning Co-doping level.

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