Electronic Phase Transitions of delta-AgxV2O5 Nanowires: Interplay between Geometric and Electronic Structures Academic Article uri icon

abstract

  • 2014 American Chemical Society. Vanadium oxide bronzes, with the general formula MxV2O5, provide a wealth of compositions and frameworks where strong electron correlation can be systematically (albeit thus far only empirically) tuned. In this work, we report the synthesis of single-crystalline -Ag0.88V2O5 nanowires and unravel pronounced electronic phase transitions induced in response to temperature and applied electric field. Specifically, a pronounced semiconductor-semiconductor transition is evidenced for these materials at ca. 150 K upon heating, and a distinctive insulator-conductor transition is observed upon application of an in-plane voltage. An orbital-specific picture of the mechanistic basis of the phase transitions is proposed using a combination of density functional theory (DFT) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. Structural refinements above and below the transition temperature, angle-resolved O K-edge NEXAFS spectra, and DFT calculations suggest that the electronic phase transitions in these 2D frameworks are mediated by a change in the overlap of dxy orbitals.

published proceedings

  • JOURNAL OF PHYSICAL CHEMISTRY C

author list (cited authors)

  • Marley, P. M., Singh, S., Abtew, T. A., Jaye, C., Fischer, D. A., Zhang, P., Sambandamurthy, G., & Banerjee, S.

citation count

  • 17

complete list of authors

  • Marley, Peter M||Singh, Sujay||Abtew, Tesfaye A||Jaye, Cherno||Fischer, Daniel A||Zhang, Peihong||Sambandamurthy, Ganapathy||Banerjee, Sarbajit

publication date

  • September 2014