Thursday, November 9, 2006, 1:30 pm — Small Seminar Room, Bldg. 510
Recent observation, using XAFS, of local distortions around Cr and V atoms
in Cr-doped V2O3 offers new explanation of its metal-insulator transition as
Cr concentration x = 0.01. Our hypothesis is that Cr atoms act as strain
defects that create long range strain fields. Thus, our model is analogous
to the Eshelby problem: the strain due to a defect in an elastic medium. Due
to their slow decay, these local lattice deformations nucleate large
(compared to one unit cell) distorted regions which should be insulating
even at small x. The growth of these regions at large x may be the trigger
of the metal-insulating transition in this system.
Hosted by: Robert Konik
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