Abstract
The effect of high pressure on the photoinduced insulator-to-metal transition in charge-ordered [bis(ethylenedithio)]tetrathiafulvalene (BEDT-TTF) salt was investigated using femtosecond spectroscopy under hydrostatic pressure. By applying pressure , the lifetime of the initially produced microscopic metallic domain becomes shorter, reflecting that condensation to the semimacroscopic metallic state is disturbed for . However, condensation is promoted for , thereby enhancing the nonlinearity of the photoinduced insulator-to-metal transition. Such nonmonotonous pressure dependence suggests competition between the increase of electronic bandwidth and photoinduced anisotropic lattice strain under pressure.
- Received 14 September 2007
DOI:https://doi.org/10.1103/PhysRevB.77.125131
©2008 American Physical Society