High-pressure X-ray diffraction study of 1T-TaS2 |
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Authors: | Sylvain Ravy,Claire Laulhé ,Jean-Paul Itié ,Pierre Fertey,Benoit Corraze,Sabrina Salmon,Laurent Cario |
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Affiliation: | 1. Synchrotron-SOLEIL, L''Orme des merisiers, Saint Aubin BP-48, 91192 Gif sur Yvette CEDEX, France;2. Institut des Matériaux Jean Rouxel, Université de Nantes-CNRS, 2 rue de la Houssinière, BP 32229, 44322 Nantes Cedex 03, France |
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Abstract: | 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. |
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Keywords: | X-ray diffraction Pressure Charge-density wave |
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