The study of the low-temperature CDW Mott state of TaS2
1T-TaS2 is a prototypical quasi-2D metallic compound revealing strong electron-phonon (e-p) coupling responsible for charge-density-wave (CDW) instabilities. The compound undergoes three successive CDW transitions; first, to an incommensurate CDW phase below 540 K and then to a nearly commensurate CDW phase at 350 K and finally to a commensurate one below ~160 K. The nature of this commensurate CDW phase is under intensive investigation. In particular, it is very interesting that 12 out of 13 Ta4+ d-electrons form some kind of molecular orbitals in David star patterns, freeing one 5d-electron. The behavior of this orphan spin at low temperatures receives currently attention of the scientific community. For example, our susceptibility data measured on a high-quality powder TaS2 sample exhibit a strong Curie-Weiss tail, suggesting that some kind of short-range correlations might as well exist at low temperatures. Thus we propose here to experimentally test this scenario by using polarized neutron option of D7 and specifically we want to measure its short range correlations.
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PARK Je-Geun; CHEONG S-W.; KLICPERA Milan; KRATOCHVILOVA marie; MANGIN-THRO Lucile; SECHOVSKY Vladimir and WILDES Andrew. (2016). The study of the low-temperature CDW Mott state of TaS2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-829
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