Superconducting Density of States and Vortex Cores of 2H-NbS2

被引：202

作者：

Guillamon, I. ^{[1
]}

Suderow, H. ^{[1
]}

Vieira, S. ^{[1
]}

Cario, L. ^{[2
]}

Diener, P. ^{[3
]}

Rodiere, P. ^{[3
]}

机构：

[1] Univ Autonoma Madrid, Fac Ciencias, Inst Ciencia Mat Nicolas Cabrera, Dept Fis Mat Condensada,Lab Bajas Temp, E-28049 Madrid, Spain

[2] Univ Nantes, CNRS, Inst Mat Jean Rouxel IMN, F-44322 Nantes 03, France

[3] UJF, CNRS, Inst Neel, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.101.166407

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Scanning tunneling microscopy and spectroscopy measurements in the superconducting dichalcogenide 2H-NbS2 show a peculiar superconducting density of states with two well-defined features at 0.97 and 0.53 meV, located, respectively, above and below the value for the superconducting gap expected from the single band s-wave BCS model (Delta=1.76k(B)T(c)=0.9 meV). Both features have a continuous temperature evolution and disappear at T-c=5.7 K. Moreover, we observe the hexagonal vortex lattice with radially symmetric vortices and a well-developed localized state at the vortex cores. The sixfold star shape characteristic of the vortex lattice of the compound 2H-NbSe2 is, together with the charge density wave order, absent in 2H-NbS2.

引用

页数：4

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