Abstract
The metal-insulator transition in was studied at ambient pressure and under hydrostatic pressure up to in the energy range of . The charge gap determined from the optical reflectivity was enhanced, . This ratio is independent of pressure, indicating that the character of the transition did not vary along the phase boundary. Above the critical pressure, , metallic spectra were recorded in the whole temperature range, as expected from the shape of the phase diagram.
- Received 15 February 2005
DOI:https://doi.org/10.1103/PhysRevB.71.193103
©2005 American Physical Society