Universal features in the photoemission spectroscopy of high-temperature superconductors.

  title={Universal features in the photoemission spectroscopy of high-temperature superconductors.},
  author={Junjing Zhao and Utpal Chatterjee and Dingfei Ai and David Hinks and Hong Zheng and G. D. Gu and John-Paul Castellan and Stephan Rosenkranz and Helmut Claus and M. R. Norman and Mohit Randeria and Juan Carlos Campuzano},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={110 44},
The energy gap for electronic excitations is one of the most important characteristics of the superconducting state, as it directly reflects the pairing of electrons. In the copper-oxide high-temperature superconductors (HTSCs), a strongly anisotropic energy gap, which vanishes along high-symmetry directions, is a clear manifestation of the d-wave symmetry of the pairing. There is, however, a dramatic change in the form of the gap anisotropy with reduced carrier concentration (underdoping… CONTINUE READING

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