Transfer of Spectral Weight and Symmetry across the Metal-Insulator Transition in VO2

T. C. Koethe, Z. Hu, M. W. Haverkort, C. Schüßler-Langeheine, F. Venturini, N. B. Brookes, O. Tjernberg, W. Reichelt, H. H. Hsieh, H.-J. Lin, C. T. Chen, and L. H. Tjeng
Phys. Rev. Lett. 97, 116402 – Published 13 September 2006

Abstract

We present a detailed study of the valence and conduction bands of VO2 across the metal-insulator transition using bulk-sensitive photoelectron and O K x-ray absorption spectroscopies. We observe a giant transfer of spectral weight with distinct features that require an explanation which goes beyond the Peierls transition model as well as the standard single-band Hubbard model. Analysis of the symmetry and energies of the bands reveals the decisive role of the V 3d orbital degrees of freedom. Comparison to recent realistic many body calculations shows that much of the k dependence of the self-energy correction can be cast within a dimer model.

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  • Received 25 April 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.116402

©2006 American Physical Society

Authors & Affiliations

T. C. Koethe1, Z. Hu1, M. W. Haverkort1, C. Schüßler-Langeheine1, F. Venturini2, N. B. Brookes2, O. Tjernberg3, W. Reichelt4, H. H. Hsieh5, H.-J. Lin6, C. T. Chen6, and L. H. Tjeng1

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
  • 2European Synchrotron Radiation Facility (ESRF), B.P. 220, 38043 Grenoble Cédex, France
  • 3Materials and Semiconductor Physics, Royal Institute of Technology, Electrum 229, S-16440 Kista, Sweden
  • 4Institut für Anorganische Chemie, Technische Universität Dresden, Helmholtzstrasse 10, D-01069, Dresden, Germany
  • 5Chung Cheng Institute of Technology, National Defense University, Taoyuan 335, Taiwan
  • 6National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu 30077, Taiwan

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Issue

Vol. 97, Iss. 11 — 15 September 2006

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