6533b82efe1ef96bd12945fc
RESEARCH PRODUCT
Scanning tunneling spectroscopy of layers of superconducting 2H-TaSe$_\textbf{2}$: Evidence for a zero bias anomaly in single layers
J. A. GalvisP. Rodi��reI. Guillam��nM. R. OsorioJ. G. RodrigoL. CarioE. Navarro-moratallaE. CoronadoS. VieiraH. Suderowsubject
Superconductivity (cond-mat.supr-con)Condensed Matter - SuperconductivityFOS: Physical sciencesdescription
We report a characterization of surfaces of the dichalcogenide TaSe$_2$ using scanning tunneling microscopy and spectroscopy (STM/S) at 150 mK. When the top layer has the 2H structure and the layer immediately below the 1T structure, we find a singular spatial dependence of the tunneling conductance below 1 K, changing from a zero bias peak on top of Se atoms to a gap in between Se atoms. The zero bias peak is additionally modulated by the commensurate $3a_0 \times 3a_0$ charge density wave of 2H-TaSe$_2$. Multilayers of 2H-TaSe$_2$ show a spatially homogeneous superconducting gap with a critical temperature also of 1 K. We discuss possible origins for the peculiar tunneling conductance in single layers.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-10-09 |