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19 April 2024

» arxiv » cond-mat/0609034

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Dual character of the electronic structure in YBa2Cu4O8: conduction bands of CuO2 planes and CuO chains
T. Kondo ; R. Khasanov ; J. Karpinski ; S. M. Kazakov ; N. D. Zhigadlo ; T. Ohta ; H. M. Fretwell ; A. D. Palczewski ; J. D. Koll ; J. Mesot ; E. Rotenberg ; H. Keller ; A. Kaminski ;
Date:	2 Sep 2006
Subject:	Superconductivity
Abstract:	We use microprobe Angle-Resolved Photoemission Spectroscopy (muARPES) to separately investigate the electronic properties of CuO2 planes and CuO chains in the high temperature superconductor, YBa2Cu4O8. In the CuO2 planes, a two dimensional (2D) electronic structure with nearly momentum independent bilayer splitting is observed. The splitting energy is 150 meV at (pi,0), almost 50% larger than in Bi2Sr2CaCu2O(8+d) and the electron scattering at the Fermi level in the bonding band is about 1.5 times stronger than in the antibonding band. The CuO chains have a quasi one dimensional (1D) electronic structure. We observe two 1D bands separated by ~ 550meV: a conducting band and an insulating band with an energy gap of ~ 240meV. We find that the conduction electrons are well confined within the planes and chains with a non-trivial hybridization.
Source:	arXiv, cond-mat/0609034
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