Abstract
The electrical conductivity and Raman spectroscopy measurements have been performed on at high pressures up to 80 GPa and variable temperatures down to 5 K. We find that the temperature dependence of the resistance in a mixed phase has an anomaly (a hump) which shifts with pressure to higher temperature. Concomitantly, a different Raman phonon mode appears in the mixed state suggesting that the electrical resistance anomaly may be related to a structural transformation. We suggest that this anomalous behavior is due to a charge-density wave state, the presence of which is indicative for an emergence of superconductivity at higher pressures.
- Received 21 January 2018
- Revised 7 June 2018
DOI:https://doi.org/10.1103/PhysRevB.97.214519
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