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Title: Tuning the charge density wave and superconductivity in 6R-TaS{sub 2−x}Se{sub x}

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{sub 2−x}Se{sub x} (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 (T{sub c}{sup onset}) shows a dome-like shape with a maximum of T{sub c}{sup onset }= 2.7 K 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 T{sub c} 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.
Authors:
; ; ; ;  [1] ; ;  [2] ;  [3] ;  [1] ;  [4] ;  [4]
  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)
  2. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031 (China)
  3. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054 (China)
  4. (China)
Publication Date:
OSTI Identifier:
22402917
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHARGE DENSITY; CONCENTRATION RATIO; ELECTRONIC STRUCTURE; HYSTERESIS; MAGNETIC FIELDS; MAGNETIC SUSCEPTIBILITY; MONOCRYSTALS; PHASE DIAGRAMS; PRESSURE RANGE GIGA PA; QUENCHING; SUPERCONDUCTIVITY; TANTALUM SULFIDES; VAPORS