Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Photoemission Studies on Chain Electronic Structures of $Y(Pr)Ba_2Cu_4O_8$

광전자실험을 이용한 $Y(Pr)Ba_2Cu_4O_8$ 물질의 체인 전자 구조분석

  • Boo, Y.G. (Institute of Physics and Applied Physics, Yonsei University) ;
  • Jung, W.S. (Institute of Physics and Applied Physics, Yonsei University) ;
  • Han, Ga-Ram (Institute of Physics and Applied Physics, Yonsei University) ;
  • Kim, C. (Institute of Physics and Applied Physics, Yonsei University)
  • Received : 2012.04.02
  • Accepted : 2012.04.18
  • Published : 2012.04.30
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Abstract

$Y(Pr)Ba_2Cu_4O_8$ system is one of the most studied high temperature superconductors. Substitution of Pr for Y in this system suppresses $T_c$ and superconductivity finally disappears at a high Pr doping. There are competing theories for the suppression of $T_c$ but systematic experimental results are very rare. In order to find the change in Fermi surface topology which can affect the superconductivity, we have performed angle-resolved photoemission studies on single crystal samples of $YBa_2Cu_4O_8$ and $PrBa_2Cu_4O_8$. While the Fermi surface of $YBa_2Cu_4O_8$ shows a similar topology to those of other cuprates, we observe only 1D like band structures in $PrBa_2Cu_4O_8$. We find no significant differences in the chain band for both samples.

Keywords

References

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