Progress in Superconductivity

한국초전도학회 (The Korean Superconductivity Society)
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광전자 분석 실험을 이용한 $Ba(Fe_{1-x}Ru_x)_2As_2$ 물질의 전자구조분석

Electronic Structure Studies on $Ba(Fe_{1-x}Ru_x)_2As_2$ by Photoemission

  • Jung, W.S. (Institute of Physics and Applied Physics, Yonsei University) ;
  • Kim, Y.K. (Institute of Physics and Applied Physics, Yonsei University) ;
  • Kim, B.Y. (Institute of Physics and Applied Physics, Yonsei University) ;
  • Matsunami, M. (UVSOR Facility, Institute for Molecular Science and The Graduate University for Advanced Studies) ;
  • Kimura, S. (UVSOR Facility, Institute for Molecular Science and The Graduate University for Advanced Studies) ;
  • Eom, M.J. (Department of Physics, Postech) ;
  • Kim, J.S. (Department of Physics, Postech) ;
  • Kim, C. (Institute of Physics and Applied Physics, Yonsei University)
  • 투고 : 2011.03.09
  • 심사 : 2011.04.19
  • 발행 : 2011.04.30
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초록

We performed angle resolved photoelectron spectroscopy (ARPES) studies on Ru doped $BaFe_2As_2$ with various Ru contents. Ru, which is doped into a parent compound $BaFe_2As_2$ and substitute Fe, does not donate or accept electrons. However, it induces superconductivity. From ARPES data along the high symmetry cuts and Fermi surface maps, we investigate the electron correlation and carrier density at the Fermi level. We observe that the Fermi velocity increases with Ru doping, suggesting reduction in electron correlation. In addition, we address issues on local vs. itinerant pictures for the magnetism in $BaFe_2As_2$.

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참고문헌

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