https://doi.org/10.1007/s100510050127
Analysis of the first electron-removal states of Ba2Cu3O4Cl2using polarization dependent angle-resolved photoelectron spectroscopy
1
Institut für Festkörper- und Werkstofforschung
Dresden, P.O. Box
270016, 01171 Dresden, Germany
2
Institut für Experimentalphysik,
Universität Hamburg,
Luruper Chaussee 149, 22761 Hamburg, Germany
Received:
19
March
1999
Revised:
15
August
1999
Published online: 15 March 2000
The first electron-removal states of the layered cuprate Ba2Cu3O4Cl2 were measured using angle-resolved photoelectron spectroscopy. The symmetry and energy-momentum relations of the lowest-lying states were determined and interpreted in terms of the motion of a single hole in the two different planar Cu-O subsystems of the Cu3O4 plane. One subsystem is antiferromagnetic as in the undoped parent compounds of the high-temperature superconductors and the other is paramagnetic and corresponds to the strongly overdoped case. The data are compared to theoretical results on hole dynamics in two-dimensional antiferromagnetic or paramagnetic spin backgrounds. The lineshape, symmetry and dispersion of the first electron-removal states of Ba2Cu3O4Cl2 can be described in terms of Zhang-Rice singlets within a single band model. The photohole lifetime in the paramagnetic subsystem of the Cu3O4 plane is much smaller than with an antiferromagnetic spin background.
PACS: 74.72.Jt – Other cuprates / 79.60.-i – Photoemission and photoelectron spectra / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000