Electronic properties of CaFe$_{2}$As$_{2}$

ORAL

Abstract

CaFe$_{2}$As$_{2}$ is a parent compound of a new family of FeAs based high-$T_{c}$ superconductors. It undergoes a first-order structural transition from low-$T$ orthorhombic to high-$T$ tetragonal phase [Ni \textit{et al.}, Phys. Rev. B \textbf{78}, 014523]. Moderate pressure lowers the transition temperature, and turns on the superconductivity [Torikachvili \textit{et al.}, Phys. Rev. Lett. \textbf{101}, 057006]. Study on its electronic properties is of crucial importance for understanding the pairing mechanism of the FeAs based superconductors. Here we present angle-resolved photoemission spectroscopy (ARPES) results on both the orthorhombic and the tetragonal phase of CaFe$_{2}$As$_{2}$. In the orthorhombic phase, we find strong $k_{z}$ dispersion on the Fermi surfaces, showing a three dimensional electronic structure. We also find dramatic difference of the Fermi surface structure between the orthorhombic and the tetragonal phase.

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Authors

  • Chang Liu

    Ames Laboratory and Iowa State University

  • Takeshi Kondo

    Ames Laboratory and Iowa State University, Ames Lab. and Dept. of Physics and Astronomy, Iowa State University

  • Ari Palczewski

    Ames Laboratory and Iowa State University

  • G. Samolyuk

    Ames Laboratory, Ames, IA, 50011, Ames Laboratory and Iowa State University, Ames Laboratory/Department of Physics and Astronomy

  • Yongbin Lee

    Ames Laboratory and Iowa State University

  • N. Ni

    Ames Laboratory and Iowa State University, Ames Laboratory and Physics Department and Astronomy, Iowa State University, Ames, IA, Ames Lab / Iowa State University, Ames Laboratory, US DOE and Iowa State University, Iowa State University, Ames Laboratory/Department of Physics and Astronomy

  • S.L. Bud'ko

    Ames Laboratory and Iowa State University, Ames Laboratory and Physics Department and Astronomy, Iowa State University, Ames, IA, Ames Laboratory, Ames Laboratory, US DOE and Iowa State University, Ames Laboratory/Iowa State University, Ames Laboratory/Department of Physics and Astronomy, Ames laboratory

  • P.C. Canfield

    Ames Laboratory and Department of Physics and Astronomy, Iowa State Univeristy, Ames, Iowa 50011, Ames Laboratory and Iowa State University, Ames Laboratory and Physics Department and Astronomy, Iowa State University, Ames, IA, Ames Laboratory, Ames Laboratory, US DOE and Iowa State University, Ames Laboratory/Department of Physics and Astronomy, Ames Lab / Iowa State University, Ames Laboratory/Iowa State University

  • Adam Kaminski

    Ames Laboratory and Iowa State University

  • Aaron Bostwick

    Advanced Light Source, Berkeley National Laboratory

  • Eli Rotenberg

    Advanced Light Source, Berkeley National Laboratory