196 citations · 1.2k across the 25 of their papers we have counts for
18 papers · 1 filter
Evolution of superconducting and transport properties in annealed FeTeSe (0.1 0.4) multiband superconductors
Yue Sun, Toshihiro Taen, Tatsuhiro Yamada +3
We investigated the superconducting and transport properties in FeTeSe (0.1 0.4) single crystals prepared by O-annealing. Sharp superconducting…
Multiband Effect and Possible Dirac Fermions in FeTeSe
Yue Sun, Toshihiro Taen, Tatsuhiro Yamada +3
We investigated the transport properties of FeTeSe single crystals with different amounts of excess Fe prepared by O annealing. The O annealing rema…
Dynamics and mechanism of oxygen annealing in FeTeSe single crystal
Yue Sun, Yuji Tsuchiya, Toshihiro Taen +6
Iron chalcogenide Fe(Te,Se) attracted much attention due to its simple structure, which is favorable for probing the superconducting mechanism. Its less toxic nature compared with…
Enhancement of Critical Current Densities in (Ba,K)Fe2As2 by 320 MeV Au Irradiation in Single Crystals and by High-Pressure Sintering in PIT Wires
Sunseng Pyon, Toshihiro Taen, Fumiaki Ohtake +7
We demonstrate a large enhancement of critical current density (Jc) up to 1.0x10^7 A/cm2 at 5 K under self-field in (Ba,K)Fe2As2 single crystals by irradiating 320 MeV Au ions. Wit…
Bulk Superconductivity in FeTeSe Induced by Annealing in Se and S Vapor
Yue Sun, Yuji Tsuchiya, Tatsuhiro Yamada +4
We reported that bulk superconductivity in FeTeSe can be induced by annealing in Se and S vapor. The well-annealed samples show a large critical current densi…
Magnetic relaxation and collective vortex creep in FeTeSe single crystal
Yue Sun, Toshihiro Taen, Yuji Tsuchiya +3
We study the vortex dynamics in high-quality FeTeSe single crystal by performing magnetization measurements of the screening current density \emph{J} and flux c…
Evolution of Superconductivity in FeTeSe Annealed in Te Vapor
Yue Sun, Yuji Tsuchiya, Tatsuhiro Yamada +4
We report a detailed study of the Te vapor annealing effect in FeTeSe single crystals. Bulk superconductivity can be gradually induced by annealing with inc…
Large, Homogeneous, and Isotropic Critical Current Density in Oxygen-Annealed Fe1+yTe0.6Se0.4 Single Crystal
Yue Sun, Toshihiro Taen, Yuji Tsuchiya +4
We reported a controllable way of removing excess Fe in Fe1+yTe0.6Se0.4 by annealing in a fixed amount of O2. Compared with the weak superconductivity induced by dilute acids, O2 a…
Annealing, acid, and alcoholic beverage effects on Fe1+yTe0.6Se0.4
Y. Sun, T. Taen, Y. Tsuchiya +2
We have systematically investigated and compared different methods to induce superconductivity in iron chalcogenide Fe1+yTe0.6Se0.4 including annealing in vacuum, N2, O2, I2 atmosp…
Anisotropies and Homogeneities of Superconducting Properties in Iron-Platinum-Arsenide Ca10(Pt3As8)(Fe1.79Pt0.21As2)5
Qing-Ping Ding, Yuji Tsuchiya, Yue Sun +3
We report a study on the anisotropy of superconducting properties in single crystalline Ca10(Pt4-δAs8)(Fe1.79Pt0.21As2)5 with Tc ~13.6 K. Under a field of 5 Oe, the sample reaches…
Enhancement of critical current density and vortex activation energy in proton-irradiated Co-doped BaFe2As2
Toshihiro Taen, Yasuyuki Nakajima, Tsuyoshi Tamegai +1
The effect of proton irradiation in Ba(Fe0.93Co0.07)2As2 single crystals is reported. We analyze temperature dependence of current density and normalized flux relaxation rate in th…
Magnetic and transport properties of iron-platinum arsenide Ca10(Pt4-δAs8)(Fe2-xPtxAs2)5 single crystal
Qing-Ping Ding, Yuji Tsuchiya, Shyam Mohan +3
We report superconducting properties of single crystalline Ca10(Pt4-δAs8)(Fe2-xPtxAs2)5 by X-ray diffraction, magnetization, resistivity, and magneto-optical imaging measurements.…
Magneto-optical imaging and transport properties of FeSe superconducting tapes prepared by diffusion method
Q. P. Ding, S. Mohan, Y. Tsuchiya +3
High-quality FeSe tapes have been prepared by using a diffusion method. By adjusting the reaction temperature and the thickness systematically, a transport critical current density…
Low-temperature Synthesis of FeTe0.5Se0.5 Polycrystals with a High Transport Critical Current Density
Qing-Ping Ding, Shyam Mohan, Yuji Tsuchiya +3
We have prepared high-quality polycrystalline FeTe0.5Se0.5 at temperature as low as 550°C. The transport critical current density evaluated by the current-voltage characteristics i…
Transport and magnetic properties of Co-doped BaFe_{2}As_{2} epitaxial thin films
Shyam Mohan, Toshihiro Taen, Hidenori Yagyuda +5
We report resistivity, Hall coefficient, current-voltage characteristics, and magneto-optical imaging measurements of epitaxial Co-doped BaFe_{2}As_{2} thin films deposited on MgO(…
Superconductivity at T_c ~ 14 K in Single Crystalline FeTeSe
T. Taen, Y. Tsuchiya, Y. Nakajima +1
Single crystalline FeTeSe with a sharp superconducting transition at 14 K is synthesized via slow furnace cooling followed by low-temperatur…
Enhancement of Critical Current Densities in Co-Doped BaFeAs with Columnar Defects Introduced by Heavy-Ion Irradiation
Y. Nakajima, Y. Tsuchiya, T. Taen +3
We report the first realization of columnar defects in Co-doped BaFeAs single crystals by heavy-iron irradiation. The columnar defects are confirmed by transmission ele…
Possible superconductivity above 25 K in single crystalline Co-doped BaFeAs
Yasuyuki Nakajima, Toshihiro Taen, Tsuyoshi Tamegai
We present superconducting properties of single crystalline Ba(FeCo)As by measuring magnetization, resistivity, upper critical field, Hall coefficient,…