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Phys. Rev. B 63, 073103 (2001) [4 pages]

X-ray absorption spectroscopy of single-crystalline (VO)2P2O7: Electronic structure and possible exchange paths

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S. Gerhold, N. Nücker, C. A. Kuntscher*, and S. Schuppler
Forschungszentrum Karlsruhe, IFP, P.O. Box 3640, D-76021 Karlsruhe, Germany

S. Stadler and Y. U. Idzerda
Naval Research Laboratory, Code 6345, Washington DC 20375

A. V. Prokofiev†, F. Büllesfeld, and W. Assmus
Kristall- und Materiallabor, Physikalisches Institut, Johann Wolfgang Goethe-Universität, Robert-Mayer-Straße 2-4, D-60054 Frankfurt (Main), Germany

Received 16 August 2000; published 25 January 2001

Using polarization-dependent V2p and O1s near-edge x-ray absorption spectroscopy, we studied the unoccupied electronic structure of single-crystalline (VO)2P2O7. It is highly anisotropic, and shows similarities to vanadium oxides like VO2 and V2O5 at the V2p edge and at the O1s 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 (VO)2P2O7, but are consistent with the alternating chain scenario.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.63.073103
DOI:
10.1103/PhysRevB.63.073103
PACS:
78.70.Dm, 71.20.Ps, 75.30.Et

*Present address: 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany.

†Guest scientist from A. F. Ioffe Physical Technical Institute, St. Petersburg 194021, Russia.

 
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