2008/07/11 by I. Guillamon, Isabel Guillamón, Hermann Suderow +8 · 3 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Density of states #Iron-based superconductors research #Lattice (music) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Scanning tunneling microscope #Spectroscopy #Superconductivity #Superconductivity in MgB2 and Alloys #Thermodynamics #Vortex #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.101.166407
5 pages, 4 figures
arxiv created 2008/07/11 · openalex publication_date 2008/10/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.