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BCS-like Bogoliubov Quasiparticles in High-Tc Superconductors Observed by Angle-Resolved Photoemission Spectroscopy

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arxiv cond-mat/0304505 v2 pith:I3H7YNOS submitted 2003-04-23 cond-mat.supr-con

BCS-like Bogoliubov Quasiparticles in High-Tc Superconductors Observed by Angle-Resolved Photoemission Spectroscopy

H. Matsui , T. Sato , T. Takahashi , S.-C. Wang , H.-B. Yang , H. Ding , T. Fujii , T. Watanabe
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A. Matsuda
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classification cond-mat.supr-con
keywords angle-resolvedbogoliubovdispersionenergyhigh-tcobservedphotoemissionquasiparticles
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We performed high-resolution angle-resolved photoemission spectroscopy on triple-layered high-Tc cuprate Bi2Sr2Ca2Cu3O10+delta. We have observed the full energy dispersion (electron and hole branches) of Bogoliubov quasiparticles and determined the coherence factors above and below EF as a function of momentum from the spectral intensity as well as from the energy dispersion based on BCS theory. The good quantitative agreement between the experiment and the theoretical prediction suggests the basic validity of BCS formalism in describing the superconducting state of cuprates.

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