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The metal-insulator (MI) transition in BaVS$_3$ has been studied at ambientpressure and under hydrostatic pressure up to $p=26 $kbar in the frequencyrange of $20-3000 $cm$^{-1}$. The charge gap determined from the opticalreflectivity is enhanced, $\Delta_{ch}(p)/k_BT_{MI}(p)\sim 12$. This ratio isindependent of pressure indicating that the character of the transition doesnot vary along the $p-T$ phase boundary. Above the critical pressure,$p_{cr}\sim20$ kbar, metallic spectra were recorded in the whole temperaturerange, as expected from the shape of the phase diagram. Our results exclude theopening of a pseudogap above $T_{MI}$ at any pressure. Below $T_{MI}$ anunusually strong temperature dependence of the charge gap was observed,resulting in a $\Delta_{ch}(T)$ deviating strongly from the mean field-likevariation of the structural order parameter.Comment: 5 pages, 3 figures. to be publishe

physical review. b, condensed matter and materials physics

Pressure-induced suppression of the spin-gapped insulator phase in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi><mml:mi mathvariant="normal">V</mml:mi><mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>: An infrared optical study

Pressure-induced suppression of the spin-gapped insulator phase inBaVS3: An infrared optical study