Superconducting Density of States and Vortex Cores of 2H-NbS2
I. Guillamón, H. Suderow, S. Vieira, L. Cario, P. Diener, P. Rodière
DOI 10.1103/PhysRevLett.101.166407 · Physical Review Letters
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Abstract
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 (Δ=1.76kBTc=0.9 meV). Both features have a continuous temperature evolution and disappear at Tc=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.
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