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ARPES Study on the Electronic Structure of Ferromagnet Rb<sub>0.93</sub>Co<sub>1.87</sub>Se<sub>2</sub>

ORAL

Abstract

As an isostructural analogue of AFe2Se2 (A=K,Rb,Cs) iron-based superconductors, ACo2Se2 (A=K,Rb,Cs) exhibits distinct magnetic ground states without manifestation of superconductivity. Specifically, in Rb0.93Co1.87Se2, a ferromagnetic transition occurs at 83K. Here we use angle-resolved photoemission spectroscopy to study the electronic structure of Rb0.93Co1.87Se2 across the ferromagnetic transition. Clear spin-splitting of bands of different orbitals are observed across the transition. Detailed comparison with first-principle calculations both in the normal state and the magnetic state will be presented. The contribution of different orbitals to the ordered moment as well as the nature of the ferromagnetism in Rb0.93Co1.87Se2 will be discussed.

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Presenters

  • Jianwei Huang

    Department of Physics and Astronomy, Rice University

Authors

  • Jianwei Huang

    Department of Physics and Astronomy, Rice University

  • Han Wu

    Department of Physics and Astronomy, Rice University

  • Zhicai Wang

    School of the Gifted Young, University of Science and Technology of China

  • Hongsheng Pang

    School of the Gifted Young, University of Science and Technology of China

  • Sung-Kwan Mo

    Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Advanced Light Source, Lawrence Berkeley National Lab, Advanced Light Source, Lawrence Berkeley National Laboratory, ALS, Lawrence Berkeley National Laboratory

  • Alexander F Kemper

    Department of Physics, North Carolina State University, North Carolina State University, Physics, North Carolina State University

  • Robert J Birgeneau

    University of California, Berkeley, Physics, University of California at Berkeley, Physics, University of California, Berkeley, Department of Physics, University of California, Berkeley

  • MENG WANG

    Department of Physics, University of California, Berkeley

  • Ming Yi

    Rice Univ, Physics and Astronomy, Rice University, Department of Physics and Astronomy, Rice University, Rice University