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29 March 2024
 
  » arxiv » 0903.2218

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Anomalous asymmetry of the Fermi surface in the YBa2Cu4O8 high temperature superconductor revealed by Angle Resolved Photoemission Spectroscopy
Takeshi Kondo ; R. Khasanov ; Y. Sassa ; A. Bendounan ; S. Pailhes ; J. Chang ; J. Mesot ; H. Keller ; N. D. Zhigadlo ; M. Shi ; S. M. Kazakov ; J. Karpinski ; A. Kaminski ;
Date 13 Mar 2009
AbstractWe use microprobe Angle-Resolved Photoemission Spectroscopy to study the Fermi surface and band dispersion of the CuO2 planes in the high temperature superconductor, YBa2Cu4O8. We find a strong in-plane asymmetry of the electronic structure between directions along a and b axes. The saddle point of the antibonding band lies at a significantly higher energy in the a direction (pi,0) than the b direction (0,pi), whereas the bonding band displays the opposite behavior. We demonstrate that the abnormal band shape is due to a strong asymmetry of the bilayer band splitting, likely caused by a non-trivial hybridization between the planes and chains. This asymmetry has an important implication for interpreting key properties of the Y-Ba-Cu-O (YBCO) family, especially the superconducting gap, transport and results of inelastic neutron scattering.
Source arXiv, 0903.2218
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