Abstract
Using polarization-dependent and near-edge x-ray absorption spectroscopy, we studied the unoccupied electronic structure of single-crystalline It is highly anisotropic, and shows similarities to vanadium oxides like and at the edge and at the threshold. The contributions from V-O and P-O orbitals could be identified. The results rule out the spin ladder model for the magnetic behavior of but are consistent with the alternating chain scenario.
- Received 16 August 2000
DOI:https://doi.org/10.1103/PhysRevB.63.073103
©2001 American Physical Society