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Anisotropy of the electronic structure of low-dimensional Sr(Ca)CuO2 single crystals studied by scanning photoelectron spectromicroscopy

Zakharov, Alexei LU ; Matsuura, AY; Lindau, Ingolf LU and Leonyuk, L (2002) In Journal of Electron Spectroscopy and Related Phenomena 122(3). p.203-208
Abstract
The energy band structure of superconducting (T-c(onset) = 80 K), low-dimensional Sr(Ca)CuO2 single crystals was studied by photoelectron spectromicroscopy. The sample consists of double parallel Cu-O chains, and spectra show a strong anisotropy for electron momenta k parallel and perpendicular to the chain direction q. Spectra were collected with two experimental setups: kparallel toq (Aperpendicular toq) and kperpendicular toq (Aparallel toq), where A is the electric field vector of the incident photon beam. By imaging the surface on the micrometer scale we find significant variations in the valence band intensity in the vicinity of about 2 eV below the Fermi level for kparallel toq. For this geometry, Aperpendicular toq and the spectra... (More)
The energy band structure of superconducting (T-c(onset) = 80 K), low-dimensional Sr(Ca)CuO2 single crystals was studied by photoelectron spectromicroscopy. The sample consists of double parallel Cu-O chains, and spectra show a strong anisotropy for electron momenta k parallel and perpendicular to the chain direction q. Spectra were collected with two experimental setups: kparallel toq (Aperpendicular toq) and kperpendicular toq (Aparallel toq), where A is the electric field vector of the incident photon beam. By imaging the surface on the micrometer scale we find significant variations in the valence band intensity in the vicinity of about 2 eV below the Fermi level for kparallel toq. For this geometry, Aperpendicular toq and the spectra are very sensitive to beam damage. This effect can be related to the breaking of weak inter-chain bonds with the high flux density (similar to10(18) photons s(-1) cm(-2)) beam focused on the sample surface. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
photoelectron, one-dimensional superconductors, Sr(Ca)CuO2, spectromicroscopy
in
Journal of Electron Spectroscopy and Related Phenomena
volume
122
issue
3
pages
203 - 208
publisher
Elsevier
external identifiers
  • wos:000174194900002
  • scopus:0036498323
ISSN
0368-2048
DOI
10.1016/S0368-2048(01)00349-8
language
English
LU publication?
yes
id
e69d415b-4f1e-48b6-8135-b345d38d26c2 (old id 342548)
date added to LUP
2007-11-19 12:13:57
date last changed
2017-01-01 07:09:36
@article{e69d415b-4f1e-48b6-8135-b345d38d26c2,
  abstract     = {The energy band structure of superconducting (T-c(onset) = 80 K), low-dimensional Sr(Ca)CuO2 single crystals was studied by photoelectron spectromicroscopy. The sample consists of double parallel Cu-O chains, and spectra show a strong anisotropy for electron momenta k parallel and perpendicular to the chain direction q. Spectra were collected with two experimental setups: kparallel toq (Aperpendicular toq) and kperpendicular toq (Aparallel toq), where A is the electric field vector of the incident photon beam. By imaging the surface on the micrometer scale we find significant variations in the valence band intensity in the vicinity of about 2 eV below the Fermi level for kparallel toq. For this geometry, Aperpendicular toq and the spectra are very sensitive to beam damage. This effect can be related to the breaking of weak inter-chain bonds with the high flux density (similar to10(18) photons s(-1) cm(-2)) beam focused on the sample surface.},
  author       = {Zakharov, Alexei and Matsuura, AY and Lindau, Ingolf and Leonyuk, L},
  issn         = {0368-2048},
  keyword      = {photoelectron,one-dimensional superconductors,Sr(Ca)CuO2,spectromicroscopy},
  language     = {eng},
  number       = {3},
  pages        = {203--208},
  publisher    = {Elsevier},
  series       = {Journal of Electron Spectroscopy and Related Phenomena},
  title        = {Anisotropy of the electronic structure of low-dimensional Sr(Ca)CuO2 single crystals studied by scanning photoelectron spectromicroscopy},
  url          = {http://dx.doi.org/10.1016/S0368-2048(01)00349-8},
  volume       = {122},
  year         = {2002},
}