High resolution Hall measurements across the VO2 metal-insulator transition reveal impact of spatial phase separation.

ABSTRACT: Many strongly correlated transition metal oxides exhibit a metal-insulator transition (MIT), the manipulation of which is essential for their application as active device elements. However, such manipulation is hindered by lack of microscopic understanding of mechanisms involved in these transitions. A prototypical example is VO2, where previous studies indicated that the MIT resistance change correlate with changes in carrier density and mobility. We studied the MIT using Hall measurements with unprecedented resolution and accuracy, simultaneously with resistance measurements. Contrast to prior reports, we find that the MIT is not correlated with a change in mobility, but rather, is a macroscopic manifestation of the spatial phase separation which accompanies the MIT. Our results demonstr

SUBMITTER: Yamin T 

PROVIDER: S-EPMC4726073 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature