TY - JOUR
T1 - Effect of stoichiometry on the superconducting transition temperature in single crystalline 2H-NbS2
AU - Lian, Hailong
AU - Wu, Yueshen
AU - Xing, Hui
AU - Wang, Shun
AU - Liu, Ying
N1 - Funding Information:
The work is supported by National Natural Science Foundation of China (Grant Nos.11274229, 11474198, 91421304) and by MOST of China (Grant Nos. 2015CB921104 and 2014CB921201). Y. L. acknowledges the support in the US by NSF under Grant No. EFMA1433378.
Publisher Copyright:
© 2017
PY - 2017/7/15
Y1 - 2017/7/15
N2 - Single crystals of 2H-NbS2 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 2H-NbS2−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.
AB - Single crystals of 2H-NbS2 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 2H-NbS2−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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U2 - 10.1016/j.physc.2017.05.003
DO - 10.1016/j.physc.2017.05.003
M3 - Article
AN - SCOPUS:85019184481
VL - 538
SP - 27
EP - 31
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
ER -