SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 77: Scanning Probe Techniques: Method Development II

O 77.9: Vortrag

Donnerstag, 30. März 2023, 12:30–12:45, REC C 213

Unveiling interference of Yu-Shiba-Rusinov states with novel multi-functionalized STM probe — •Artem Odobesko, Felix Friedrich, and Mathias Bode — Physikalisches Institut, Universität Würzburg, 97074, Würzburg, Germany

Scattering of superconducting pairs by magnetic impurities on superconducting surface results into pairs of sharp ingap resonances, known as Yu-Shiba-Rusinov states. By analogue with interference of quasiparticles scattered by defects in normal metals, these excitations form periodic charge density texture around magnetic impurity. Typically, STM is equipped with a superconducting (SC) probe to increase the energy resolution bypassing thermal broadening to detect these states. However, with such STM probe it almost unattainable to observe the spatial oscillatory behavior of YSR wave function due to a very fast spatial attenuation away from the impurity (with decay ~ 1/r ). In this work, we attach a CO molecule to a SC-probe to maximize simultaneously both spatial and energy resolution. We examine the LDOS distribution of YSR states around the magnetic Fe dimer on Nb(110). The last leads to hybridization of YSR states, which can be interpreted as symmetric and antisymmetric combinations of YSR excitation of an individual Fe impurity. Using such CO-SC-probe we are able to map both symmetric and antisymmetric oscillatory interference patterns of hybridized YSR states in vicinity of Fe dimer. Compared to measurements made with CO-free probe, we demonstrate an exceptional spatial sensitivity combined with high energy resolution with a new multi-functionalized probe.