1. Tuning the charge density wave and superconductivity in 6R-TaS2-xSex.
- Author
-
Liu, Y., Lu, W. J., Li, L. J., Zhu, X. D., Song, W. H., Ang, R., Ling, L. S., Liu, X. Z., and Sun, Y. P.
- Subjects
ELECTRON density ,SUPERCONDUCTIVITY ,ELECTRIC properties of single crystals ,MAGNETIC susceptibility ,MAGNETIC hysteresis ,MAGNETIC fields - Abstract
The transition-metal dichalcogenides provided a good platform for the investigation of superconductivity and charge-density-wave (CDW) order. A series of high quality 6R-TaS
2-x Sex (0≤x≤1.6) single crystals were fabricated by the chemical-vapor-transport method and systematically investigated. The CDW becomes more stable with more S being replaced by Se, which causes expansion of the lattice, and produces a negative chemical pressure in the system. The x dependence of the onset of superconductivity (Tc onset ) shows a dome-like shape with a maximum of Tc onset =2.7K at x=0.8. The magnetic susceptibility (4πχ) of x=0.8 under the hydrostatic pressure P=1.0 GPa was also measured, which showed a small increase of Tc and superconducting volume fraction. A pronounced peak effect was observed in the isothermal hysteresis with magnetic field (H) parallel to c-axis, which may arise from the quenching inhomogeneity and/or the stacking disorder. Finally, the evolution of the electronic states tuned by Se-doping was summarized in the phase diagram. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
- View/download PDF