SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 27: Focus Session: Unconventional Transport Phenomena in Low-Dimensional Superconducting Heterostructures
TT 27.4: Vortrag
Mittwoch, 29. März 2023, 11:15–11:30, HSZ 03
Investigating the mechanism behind the Josephson Diode Effect in NiTe2/superconductor Devices — •Emily C. McFarlane1, Jonas A. Krieger1, Mihir Date1, Banabir Pal1, Procopios C. Constantinou2, Vladimir N. Strocov2, Stuart S. P. Parkin1, and Niels B. M. Schröter1 — 1Max Planck Institute of Microstructure Physics, Halle, Germany — 2Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland
The Josephson diode - recently realized in NiTe2/superconductor devices in the presence of an external magnetic field [1] - has many potential uses in new superconducting memory and logic devices. These NiTe2/Ti/Nb devices are the first Josephson diodes where the Josephson diode effect (JDE) was concluded to arise from finite momentum Cooper pairing. However, the role of the Ti layer directly at the NiTe2 interface is not yet fully understood. Ti-doped NiTe2 is seen to be superconducting [2], so here we investigate the possibility of intrinsic superconductivity at the NiTe2/Ti interface by investigating its electronic structure with angle-resolved photoelectron spectroscopy. In isostructural PdTe2, a van Hove singularity (vHS) near the Fermi level was linked to intrinsic superconductivity [3]. We find a similar vHS in the vicinity of the Fermi level in the electronic structure of NiTe2, which can be shifted in energy at the interface due to a doping effect by aluminium.
[1] B. Pal et al., Nat. Phys. 18, 1228 (2022)
[2] B. S. de Lima et al., Solid State Commun. 283, 27 (2018)
[3] Kyoo Kim et al., Phys. Rev. B 97, 165102 (2018)