# Anomalies in the Fermi surface and band dispersion of quasi-one-dimensional CuO chains in the high-temperature superconductor YBa$_{2}$Cu$_{4}$O$_{8}$

Kondo, T; Khasanov, R; Karpinski, J; Kazakov, S; Zhigadlo, N; Bukowski, Z; Shi, M; Bendounan, A; Sassa, Y; Chang, J; Pailhés, S; Mesot, J; Schmalian, J; Keller, H; Kaminski, A (2010). Anomalies in the Fermi surface and band dispersion of quasi-one-dimensional CuO chains in the high-temperature superconductor YBa$_{2}$Cu$_{4}$O$_{8}$. Physical Review Letters, 105(26):267003.

## Abstract

We have investigated the electronic states in quasi-one-dimensional CuO chains by microprobe angle resolved photoemission spectroscopy. We find that the quasiparticle Fermi surface consists of six disconnected segments, consistent with recent theoretical calculations that predict the formation of narrow, elongated Fermi surface pockets for coupled CuO chains. In addition, we find a strong renormalization effect with a significant kink structure in the band dispersion. The properties of this latter effect [energy scale (∼40  meV), temperature dependence, and behavior with Zn-doping] are identical to those of the bosonic mode observed in CuO2 planes of high-temperature superconductors, indicating they have a common origin.

© 2010 The American Physical Society

## Abstract

We have investigated the electronic states in quasi-one-dimensional CuO chains by microprobe angle resolved photoemission spectroscopy. We find that the quasiparticle Fermi surface consists of six disconnected segments, consistent with recent theoretical calculations that predict the formation of narrow, elongated Fermi surface pockets for coupled CuO chains. In addition, we find a strong renormalization effect with a significant kink structure in the band dispersion. The properties of this latter effect [energy scale (∼40  meV), temperature dependence, and behavior with Zn-doping] are identical to those of the bosonic mode observed in CuO2 planes of high-temperature superconductors, indicating they have a common origin.

© 2010 The American Physical Society

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## Additional indexing

Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2010 13 Feb 2011 16:33 17 Feb 2018 18:37 American Physical Society 0031-9007 Green https://doi.org/10.1103/PhysRevLett.105.267003 http://arxiv.org/abs/1012.1846

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