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*∼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.
E., A., L., B., DI CASTRO, D., S., L., L., M., C., M., et al. (2007). Evidence of a pressure-induced metallization process in monoclinic VO2. PHYSICAL REVIEW LETTERS, 98, 196406 [10.1103/PhysRevLett.98.196406].
Evidence of a pressure-induced metallization process in monoclinic VO2
DI CASTRO, DANIELE;
2007-05-11
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*∼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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
