Spin excitations as in hole-doped Ba$_{0.67}$K$_{0.33}$Fe$_{2}$As$_{2}$ superconductor

ORAL

Abstract

We used inelastic neutron scattering to study the optimally doped Ba$_{0.67}$K$_{0.33}$Fe$_{2}$As$_{2}$ (Tc=38K). In contrast to electron doped counterpart, we found that resonance is almost none-L dependence as shown in Fig.1 (b), but the spin gaps are. It is gaped along (0.5,0.5,0), however essentially gapless along (0.5,0.5,1). Meanwhile, the spin correlation is strongly temperature dependence which has not been observed in electron-doped 122 materials at all. The above findings clearly suggest that hole-doped region is indeed different from electron-doped region.

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Authors

  • Chenglin Zhang

    University of Tennessee, Knoxville, University of Tennessee, Physics Dept, University of Tennessee

  • Meng Wang

    University of Tennessee, Physics Dept

  • Miaoyin Wang

    University of Tennessee, Physics Dept, Department of Physics and Astronomy, University of Tennessee, Knoxville

  • Jun Zhao

    University of Tennessee, Physics Dept

  • Marty Karol

    ORNL, Oak Ridge National Laboratory

  • M.A. Lumsden

    Oak Ridge National Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37831

  • Songxue Chi

    National Institute of Standards and Technology

  • Sung Chang

    National Institute of Standards and Technology

  • Jeffrey Lynn

    NIST Center for Neutron Research, Gaithersburg, MD, National Institute of Standards and Technology, NIST Center for Neutron Research

  • Huiqian Luo

    Institute of Physics, Chinese Academy of Sciences

  • Tao Xiang

    Institute of Physics, Chinese Academy of Sciences

  • Jiangping Hu

    Purdue University, Department of Physics, Purdue University

  • Pengcheng Dai

    University of Tennessee, Knoxville, University of Tennessee and ORNL, University of Tennessee, Physics Dept, University of Tennessee