Toshihiro Taen

Superconductivity at T_{c}∼14 K in single-crystalline FeTe_{0.61}Se_{0.39}

Single-crystalline

Possible Superconductivity above 25 K in Single-Crystalline Co-Doped BaFe2As2

{\text{FeTe}}_{0.61}{\text{Se}}_{0.39}

Enhancement of critical current density in Co-doped BaFe 2 As 2 with columnar defects introduced by heavy-ion irradiation

with a sharp superconducting transition at

Effects of particle irradiations on vortex states in iron-based superconductors

{T}_{c}\ensuremath{\sim}14\text{ }\text{K}

Dynamics and mechanism of oxygen annealing in Fe1+yTe0.6Se0.4 single crystal

is synthesized via slow furnace cooling followed by low-temperature annealing. The effect of annealing on the chemical and superconducting inhomogeneities is carefully characterized. We also report resistivity, magnetization, and magneto-optical images of this crystal. Based on the Bean model, critical current density is estimated to exceed

Effects of annealing, acid and alcoholic beverages on Fe1+yTe0.6Se0.4

1\ifmmode\times\else\texttimes\fi{}{10}^{5}\text{ }\text{A}/{\text{cm}}^{2}

Low-temperature synthesis of FeTe0.5Se0.5 polycrystals with a high transport critical current density

below 5 K under zero field. Weak fish-tail effect is identified at lower temperatures.

Magneto-optical imaging and transport properties of FeSe superconducting tapes prepared by the diffusion method

We present the superconducting properties of single-crystalline Ba(Fe 0.9 Co 0.1 ) 2 As 2 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 J c = 10 5 A/cm 2 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(Fe 0.9 Co 0.1 ) 2 As 2 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.

Enhancement of critical current density and vortex activation energy in proton-irradiated Co-dopedBaFe2As2

We report the first realization of columnar defects in Co-doped BaFe

Large, Homogeneous, and Isotropic Critical Current Density in Oxygen-Annealed Fe1+yTe0.6Se0.4 Single Crystal

_{2}