We present complete Fermi-surface mappings of an untwinned single crystal of (Formula presented) in two distinct photon polarization geometries. Various methods for Fermi-surface determination with angle-resolved photoelectron spectroscopy are discussed and a technique based on the momentum space density of states is developed and applied. The data reveal the presence of two (Formula presented) plane-derived Fermi-surface pockets, along with weak evidence for a single chain sheet, in agreement with earlier work on twinned crystals and ab initio predictions, but show no sign of the expected “stick” pocket centered at (Formula presented). In contrast with earlier work on (Formula presented) we see no evidence for “shadow bands” in optimally doped (Formula presented) supporting the contention that these features arise from structural rather than magnetic correlations.
|Original language||English (US)|
|Number of pages||9|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jan 1 1998|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics