Effects of single- and multi-substituted Zn ions in doped-122 type iron-based superconductors

ORAL

Abstract

Recent experiments on Zn-substituted 122-type iron-based superconductors at electron- and hole- doped region provide us with a testing ground to understand the effect of Zn impurities in the system. Here, our first-principle calculations of the electronic structure reveal the Zn 4$s$-orbital is partially occupied, suggesting the effect of Zn 4$s$-orbital could not be neglected. We focus on Zn 4$s$-orbital instead of its 3$d$-orbital. Through self-consistent lattice Bogoliubov-de Gennes (BdG) calculation on a two-orbital model, our results qualitatively agree with the experimental measurements.

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Authors

  • Yuanyuan Zhao

    • Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA

  • Bo Li

    • Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA

  • Wei Li

    • State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Informat

  • Hong-Yi Chen

    • National Taiwan Normal University, Department of Physics, Taipei 116, Taiwan

  • Kevin E. Bassler

    • Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA

  • C. S. Ting

    • Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA