Dual character of the electronic structure of YBa2Cu4O8: The conduction bands of CuO2 planes and CuO chains

TitleDual character of the electronic structure of YBa2Cu4O8: The conduction bands of CuO2 planes and CuO chains
Publication TypeJournal Article
Year of Publication2007
AuthorsKondo T, Khasanov R, Karpinski J, Kazakov SM, Zhigadlo ND, Ohta T, Fretwell HM, Palczewski AD, Koll JD, Mesot J, Rotenberg E, Keller H, Kaminski A
Journal TitlePhysical Review Letters
Volume98
Pages157002
Date PublishedApr
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberISI:000245691400052
KeywordsANGLE-RESOLVED PHOTOEMISSION, bi2sr2cacu2o8+delta, dispersion, pressure, state, t-c, temperature
Abstract

We use microprobe angle-resolved photoemission spectroscopy (mu ARPES) to separately investigate the electronic properties of CuO2 planes and CuO chains in the high temperature superconductor, YBa2Cu4O8. For the CuO2 planes, a two-dimensional (2D) electronic structure is observed and, in contrast to Bi2Sr2CaCu2O8+delta, the bilayer splitting is almost isotropic and 50% larger, which strongly suggests that bilayer splitting has no direct effect on the superconducting properties. In addition, the scattering rate for the bonding band is about 1.5 times stronger than the antibonding band and is independent of momentum. For the CuO chains, the electronic structure is quasi-one-dimensional and consists of a conduction and insulating band. Finally, we find that the conduction electrons are well confined within the planes and chains with a nontrivial hybridization.

DOI10.1103/PhysRevLett.98.157002
Alternate JournalPhys. Rev. Lett.