ISSN:
1434-6036
Keywords:
PACS. 74.72.Jt Other cuprates - 79.60.-i Photoemission and photoelectron spectra - 71.27.+a Strongly correlated electron systems; heavy fermions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510050127
