Evidence of a pressure-induced metallization process in monoclinic VO2.
Phys Rev Lett
; 98(19): 196406, 2007 May 11.
Article
em En
| MEDLINE
| ID: mdl-17677642
ABSTRACT
Raman and combined infrared transmission and reflectivity measurements were carried out at room temperature (RT) on monoclinic VO2 over the 0-19 GPa and 0-14 GPa pressure ranges. Both lattice dynamics and optical gap show a remarkable stability up to P* approximately 10 GPa whereas subtle modifications of V ion arrangements within the monoclinic lattice, together with the onset of a metallization process via band gap filling, are observed for P >P*. Differently from P=0, where the VO2 metallic phase is found only in conjunction with the rutile structure above 340 K, a new RT metallic phase within a monoclinic structure appears accessible in the high pressure regime.
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2007
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Article
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Itália