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Effect of stoichiometry on the superconducting transition temperature in single crystalline 2 H -NbS 2

Physica C: Superconductivity and its Applications, ISSN: 0921-4534, Vol: 538, Page: 27-31
2017
  • 10
    Citations
  • 0
    Usage
  • 28
    Captures
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  • 0
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    10
    • Citation Indexes
      10
  • Captures
    28

Article Description

Single crystals of 2 H -NbS 2 are prepared by chemical vapor transport method under varying conditions. The residual resistivity ratio (RRR) of the as-grown single crystals is observed to change from 10 to 60, while the superconducting transition temperatures ( Tc ) remain around 6.2 K. Changes in stoichiometry were obtained by annealing in different conditions, resulting in sulfur deficient 2 H -NbS 2−y single crystals. Both Tc and RRR of the annealed samples are found to drop drastically when y increases from 0.05 to 0.10, which is argued to be the effect of enhanced electron scattering caused by the decreased interlayer coupling evidenced by the increase of the c -axis lattice constant after annealing, possibly due to Nb intercalation between layers.

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