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Pressure-induced suppression of the spin-gapped insulator phase in BaVS3: an infrared optical study

The metal-insulator transition in BaVS3 was studied at ambient pressure and under hydrostatic pressure up to p=26 kbar in the energy range of 2.5-500 meV. The charge gap determined from the optical reflectivity was enhanced, Deltach(p)/kBTMI (p)12. This ratio is independent of pressure, indicating that the character of the transition did not vary along the p-T phase boundary. Above the critical pressure, pcr~20 kbar, metallic spectra were recorded in the whole temperature range, as expected from the shape of the phase diagram.

metal-insulator transitions and other electronic transitions; infrared and raman spectra in inorganic crystals; liquid behavior; transition; spectroscopy

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