Volume 108, Number 3, November 2014
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||03 November 2014|
Probing the electronic and local structural changes across the pressure-induced insulator-to-metal transition in VO2
1 European Synchrotron Radiation Facility - BP 220, 38043 Grenoble Cedex, France, EU
2 CELLS-ALBA, Carretera - BP 1413, Cerdanyola del Vallés, 08290, Barcellona, Spain, EU
3 Dipartimento di Fisica, Università di Roma Sapienza - P.le Aldo Moro 2, 00185 Roma, Italy, EU
4 Elettra-Sincrotrone - Strada Statale 14 - km 163,5 in AREA Science Park, 34149 Basovizza, Trieste, Italy, EU
5 Max Planck Institute for the Structure and Dynamics of Matter - Luruper Chaussee 149, 22761 Hamburg, Germany, EU
6 High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institution of Washington Washington DC 20015, USA
7 Dipartimento di Chimica, Università di Pavia - Via Taramelli, 27100 Pavia, Italy, EU
Received: 21 August 2014
Accepted: 12 October 2014
Local and electronic structures of vanadium in are studied across the high-pressure insulator-to-metal (IMT) transition using V K-edge x-ray absorption spectroscopy. Unlike the temperature-induced IMT, pressure-induced metallization leads to only subtle changes in the V K-edge prepeak structure, indicating a different mechanism involving smaller electronic spectral weight transfer close to the chemical potential. Intriguingly, upon application of the hydrostatic pressure, the electronic structure begins to show substantial changes well before the occurrence of the IMT and the associated structural transition to an anisotropic compression of the monoclinic metallic phase.
PACS: 61.05.cj – X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc. / 71.30.+h – Metal-insulator transitions and other electronic transitions / 64.70.K- – Solid-solid transitions
© EPLA, 2014
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