Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Temperature Dependent Angle Resolved Photoemission Spectroscopy Study of Pseudo-gaps in $Sm_{1.82}Ce_{0.18}CuO_4$

각분해 광전자분석 실험을 이용한 $Sm_{1.82}Ce_{0.18}CuO_4$ 물질의 온도에 따른 가짜 갭 연구

  • Song, D.J. (Institute of Physics and Applied Physics, Yonsei U) ;
  • Choi, H.Y. (Institute of Physics and Applied Physics, Yonsei U) ;
  • Kim, Chul (Institute of Physics and Applied Physics, Yonsei U) ;
  • Park, S.R. (Institute of Physics and Applied Physics, Yonsei U) ;
  • Kim, C. (Institute of Physics and Applied Physics, Yonsei U) ;
  • Eisaki, H. (National Institute of Advanced Industrial Science and Technology)
  • Received : 2010.03.04
  • Accepted : 2010.04.12
  • Published : 2010.04.30
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Abstract

There are theoretical and experimental evidences for the pseudo-gap in electron doped cuprates being due to interaction between electrons and anti-ferromagnetism(AFM). A remaining issue is on how AFM correlates with pseudo-gap, and eventually with superconductivity. To elucidate the issue, we have performed temperature dependent angle-resolved photoemission studies of an e-doped cuprate superconductor $Sm_{2-x}Ce_xCuO_4$(SCCO) x=0.18 at 20K and 150K. In the case of $Nd_{2-x}Ce_xCuO_4$, the most well known e-doped cuprate, pseudo-gap disappears at around 100 K for x=0.17. Our experimental result reveals that the pseudo-gap of SCCO exists even at 150K for x=0.18. This result implies that the AFM of SCCO survives even in x=0.18, which agrees with previously reported phase diagram of SCCO. Yet, the superconductivity disappears around x=0.18 for both NCCO and SCCO in spite of the difference in the magnetic order. This result sheds a light on the disappearance of superconductivity on the over-doped side.

Keywords

References

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