Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 2: Superconductivity: Properties and Electronic Structure 1
TT 2.4: Vortrag
Montag, 20. März 2017, 10:15–10:30, HSZ 103
Scanning tunneling microscope study of MoN at the superconductor-insulator transition — •Hong Zheng1, Ina Schneider2, Christoph Strunk2, and Elke Scheer1 — 1Department of Physics, University of Konstanz, Konstanz, Germany — 2Department of Physics, University of Regensburg, Regensburg, Germany
Superconductor-insulator transition is a phenomenon which has intrigued scientists for several decades. Generally the transition can be induced by magnetic field or decrease of film thickness. Numerous efforts undertaken in a variety of 2D materials reveal remarkable both in the insulating and superconducting state1-4. However, the mechanism behind the transition is still under debate since no theory can explain yet all these experimental findings.
To learn more about the nature of the transition we perform a scanning tunneling microscope study on molybdenum nitride (MoN) thin films close to the superconductor-insulator transition. The fully studied topography shows a disordered structure of MoN thin films whose typical grain size is about 25 nm regardless of the fabrication temperature. In the scanning tunneling spectroscopy of superconducting samples mostly clear gaps and pronounced coherence peaks with slight intensity fluctuations from spot to spot are observed. We will present first result of shot noise measurements of samples whose thickness is very close to the transition point and try to reveal more intrinsic properties besides the topography and spectroscopy information.