Strain-induced bond buckling and its role in insulating properties of Cr-doped V2O3

A. I. Frenkel, D. M. Pease, J. I. Budnick, P. Metcalf, E. A. Stern, P. Shanthakumar, T. Huang

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Structural transformations around both V and Cr atoms in (V1-xCrx)2O3 across its metal-insulator transition (MIT) at xâ 0.01 are studied by extended x-ray absorption fine-structure technique. Our new results for Cr made possible by the use of a novel x-ray analyzer that we developed reveal the substitutional mechanism of Cr doping. We find that this system has a buckled structure with short Cr-V and long V-V bonds. This system of bonds is disordered around the average trigonal lattice ascertained by x-ray diffraction. Such local distortions can result in a long range strain field that sets in around dilute Cr atoms in microscopic regions. We suggest that such locally strained regions should be insulating even at small x. The possibility of local insulating regions within a metallic phase, first suggested by Rice and Brinkman in 1972, remains unaccounted for in modern MIT theories.

Original languageEnglish
Article number195502
JournalPhysical Review Letters
Issue number19
StatePublished - 2006
Externally publishedYes


Dive into the research topics of 'Strain-induced bond buckling and its role in insulating properties of Cr-doped V2O3'. Together they form a unique fingerprint.

Cite this