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

Yasuyuki Nakajima; Toshihiro Taen; Tsuyoshi Tamegai

doi:10.1143/JPSJ.78.023702

paper

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

arXiv:0811.2621 · doi:10.1143/JPSJ.78.023702

Abstract

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 $J_{c} = 1 0^{5}$ 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.

arXiv comment4 pages, 5 figures

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

Abstract

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Possible superconductivity above 25 K in single crystalline Co-doped BaFe2​As2​

Abstract

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Cited by in corpus (38)

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