Ravy, S., Laulhe, C., Itie, J.-P., Fertey, P., Corraze, B., Salmon, S. & Cario, L. (2012) High-pressure X-ray diffraction study of 1T-TaS2. Physica B, 407 1704–1706.
Added by: Laurent Cournède (2016-03-10 21:28:39)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 0921-4526
Clé BibTeX: Ravy2012
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Mots-clés: charge-density, Charge-density wave, phase, Pressure, waves, X-ray diffraction
Créateurs: Cario, Corraze, Fertey, Itie, Laulhe, Ravy, Salmon
Collection: Physica B
Consultations : 10/447
Indice de consultation : 3%
Indice de popularité : 0.75%
We present a room temperature high-pressure X-ray diffraction study of the layered compound 1T-TaS2 up to 20 GPa. This material is known to exhibit a variety of structural phase transitions that are ascribed to the stabilization of charge density wave states. It has been recently shown that at pressures larger than 3 GPa and up to 25 GPa, 1T-TaS2 becomes superconductor below about 5 K. It was suggested that this superconductivity coexists with different CDW states, an hypothesis that can be tested by X-ray diffraction. Our first results at room temperature show that at around 1.9 GPa, the nearly-commensurate (NCCDW) phase transforms into a phase similar to the high temperature incommensurate phase (ICCDW). Above 9 GPa, we show the existence of another IC phase, still discernable up to 20 GPa despite the pressure-induced crystal damage above 13 GPa. These results are consistent with resistivity measurements, but call for a complete exploration of the P-T phase diagram of 1T-TaS2. (c) 2012 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède