Condensed Matter Physics Seminar

An X-ray Study of the Metal–Insulator Transition System Cr2O3 Doped V2O3 [*]

Professor Douglas M. Pease
Physics Department

Cr2O3 doped into V2O3 at only the 1% level changes the system from a paramagnetic metal to a paramagnetic insulator. According to Mattheiss, this effect is not expected based on local density functional (LDF) theory, and he conjectures it is due to a non substitutional site selection of Cr. Also, various theorists have conjectured that the transition could be a percolative variant of a Mott–Hubbard transition, but no model has been suggested. We have shown the following:

  1. Mattheiss’ conjecture is incorrect; therefore LDF theory indeed fails in this system.
  2. We have experimentally discovered a likely mechanism for a percolative Mott–Hubbard transition.
  3. Our X-ray near edge spectra support a percolative transition.

[*] D.M. Pease, A.I. Frenkel, J.I. Budnick, P. Shathakumar, E.A. Stern, P. Metcalf, and T. Huang.

Thursday, December 7, 2006
2:00 pm
Gant Science Complex
Physics Department
Room P121

(The seminar is followed by coffee/tea, cookies, and an informal discussions.)

© 2006 Department of Physics, University of Connecticut
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