Possible Superconductivity above 25 K in Single-Crystalline Co-Doped BaFe<SUB>2</SUB>As<SUB>2</SUB>

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  • Nakajima Yasuyuki
    Department of Applied Physiscs, The University of Tokyo JST, Transformative Research-Project on Iron Pnictides (TRIP)
  • Taen Toshihiro
    Department of Applied Physiscs, The University of Tokyo
  • Tamegai Tsuyoshi
    Department of Applied Physiscs, The University of Tokyo JST, Transformative Research-Project on Iron Pnictides (TRIP)

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  • Possible superconductivity above 25K in single-crystalline co-doped BaFe2As2

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We present the superconducting properties of single-crystalline Ba(Fe0.9Co0.1)2As2 by measuring its magnetization, resistivity, upper critical field, Hall coefficient, and magneto-optical images. The magnetization measurements reveal a fish-tail hysteresis loop at high temperatures and a relatively high critical current density above Jc=105 A/cm2 at low temperatures. The upper critical field determined by resistive transition is anisotropic with an anisotropic parameter of ∼3.5. Hall effect measurements indicate that Ba(Fe0.9Co0.1)2As2 is a multiband system and that the mobility of electrons is dominant. Magneto-optical imaging reveals a prominent Bean-like penetration of vortices, although there is a slight inhomogeneity in a sample. Moreover, we observe distinct superconductivity above 25 K, which leads us to speculate that a higher transition temperature can be realized by fine-tuning the Co-doping level.

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