Large, Homogeneous, and Isotropic Critical Current Density in Oxygen-Annealed Fe

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概要

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• We reported a controllable way of removing excess Fe in Fe<inf>1+y</inf>Te<inf>0.6</inf>Se<inf>0.4</inf>by annealing in a fixed amount of O<inf>2</inf>. Compared with the weak superconductivity induced by dilute acids, O<inf>2</inf>annealing can successfully induce bulk superconductivity. Proper O<inf>2</inf>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 J_{\text{c}}^{H\parallel c}\sim 3\times 10^{5} A/cm²and J_{\text{c}}^{H\parallel ab}\sim 2.5\times 10^{5} A/cm²at 2 K. Furthermore, magneto-optical images reveal isotropic current flow within the ab-plane.

• 2013-04-25

著者

• Tamegai Tsuyoshi

  Department Of Applied Physics The University Of Tokyo

• Sun Yue

  Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

• Taen Toshihiro

  Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

• Ding Qingping

  Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

• Tsuchiya Yuji

  Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

• Pyon Sunsen

  Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

• Shi Zhixiang

  Department of Physics, Southeast University, Nanjing 211189, People's Republic of China

• Shi Zhixiang

  Department of Physics, Southeast University, Nanjing 211189, People's Republic of China

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