TY - JOUR
T1 - Large, homogeneous, and isotropic critical current density in oxygen-annealed fe1+yte0:6se0:4 single crystal
AU - Sun, Yue
AU - Taen, Toshihiro
AU - Tsuchiya, Yuji
AU - Ding, Qingping
AU - Pyon, Sunsen
AU - Shi, Zhixiang
AU - Tamegai, Tsuyoshi
PY - 2013/4
Y1 - 2013/4
N2 - 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 annealing can successfully induce bulk superconductivity. Proper O2 annealing changes the temperature dependence of resistivity at low temperatures from semiconducting to metallic, which comes from the deintercalation of excess Fe. Critical current densities with field along the c-axis and ab-plane are found almost isotropic with large values of JHkcc 3 × 105 A/cm2 and JHkabc 2:5 × 10 5 A/cm2 at 2 K. Furthermore, magneto-optical images reveal isotropic current flow within the ab-plane.
AB - 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 annealing can successfully induce bulk superconductivity. Proper O2 annealing changes the temperature dependence of resistivity at low temperatures from semiconducting to metallic, which comes from the deintercalation of excess Fe. Critical current densities with field along the c-axis and ab-plane are found almost isotropic with large values of JHkcc 3 × 105 A/cm2 and JHkabc 2:5 × 10 5 A/cm2 at 2 K. Furthermore, magneto-optical images reveal isotropic current flow within the ab-plane.
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U2 - 10.7567/APEX.6.043101
DO - 10.7567/APEX.6.043101
M3 - Article
AN - SCOPUS:84880913319
SN - 1882-0778
VL - 6
JO - Applied Physics Express
JF - Applied Physics Express
IS - 4
M1 - 043101
ER -