Pressure-induced metallization and amorphization in V O2(A ) nanorods
Abstract
A metallic state enabled by the metal-insulator transition (MIT) in single crystal V O2(A ) nanorods is demonstrated, which provides important physical foundation in experimental understanding of MIT in V O2 . The observed tetragonal metallic state at ∼28 GPa should be interpreted as a distinct metastable state, while increasing pressure to ∼32 GPa, it transforms into a metallic amorphous state completely. The metallization is due to V 3 d orbital electrons delocalization, and the amorphization is attributed to the unique variation of V-O-V bond angle. A metallic amorphous V O2 state is found under pressure, which is beneficial to explore the phase diagram of V O2 . Furthermore, this work proves the occurrence of both the metallization and amorphization in octahedrally coordinated materials.
- Publication:
-
Physical Review B
- Pub Date:
- May 2016
- DOI:
- 10.1103/PhysRevB.93.184109
- Bibcode:
- 2016PhRvB..93r4109C