Properties of epitaxial Ba(Fe$_{\mathrm{1-x}}$Co$_{\mathrm{x}})_{2}$As$_{2}$ thin films on different substrates

ORAL

Abstract

We have grown epitaxial, optimally-doped superconducting Ba(Fe$_{0.92}$Co$_{0.08})_{2}$As$_{2}$ films on SrTiO$_{3}$, (La, Sr)(Al, Ta)O$_{3}$ and LaAlO$_{3}$ substrates, which have a range of lattice mismatch, and studied the strain effect on the structural and transport properties of the films. We found that the superconducting transition temperature increased as the c lattice constant decreased and a lattice constant increased. The thickness dependence of the superconducting transition temperature was studied, which was related to the strain and strain relaxation. A zero-resistance $T_{c}$ of 21.7 K was obtained in the 120 nm-thick Ba(Fe$_{0.92}$Co$_{0.08})_{2}$As$_{2}$ film on SrTiO$_{3}$ substrate.

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Authors

  • Qingyu Lei

    • Department of Physics, Temple University

  • M. Golalikhani

    • Department of Physics, Temple University

  • A. Rafti

    • Department of Physics, Temple University

  • J. Qiu

    • Department of Physics, Temple University

  • M. Hambe

    • Department of Physics, Temple University

  • F. Williams

    • Applied Research Center, Center for Materials Research, Norfolk State University

  • Q. Yang

    • Applied Research Center, Center for Materials Research, Norfolk State University

  • D. Temple

    • Applied Research Center, Center for Materials Research, Norfolk State University

  • E.D. Bauer

    • Materials Physics and Applications, Los Alamos National Laboratory

  • F. Ronning

    • Materials Physics and Applications, Los Alamos National Laboratory

  • Q.X. Jia

    • Materials Physics and Applications, Los Alamos National Laboratory

  • X.F. Wang

    • Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of science and Technology of China

  • X.H. Chen

    • Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of science and Technology of China

  • J.D. Weiss

    • Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University

  • E.E. Hellstrom

    • Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University

  • X.X. Xi

    • Department of Physics, Temple University