SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Superconductivity: Properties and Electronic Structure
TT 3.11: Vortrag
Montag, 27. März 2023, 12:15–12:30, HSZ 103
Quantum interference in a finite-width mesoscopic ring with superconducting vortices — Gian Paolo Papari1,2,3 and •Vladimir M. Fomin4,5 — 1Dipartimento di Fisica, Università di Napoli “Federico II”, I-80126 Napoli, Italy — 2CNR-SPIN, UOS Napoli, I-80126 Napoli, Italy — 3Istituto Nazionale di Fisica Nucleare (INFN), Naples Unit, I-80126 Napoli, Italy — 4Institute for Integrative Nanosciences (IIN), Leibniz IFW Dresden, D-01069 Dresden, Germany — 5Moldova State University, MD-2009, Chişinău, Republic of Moldova
We analyze the origin of the parabolic background of magnetoresistance oscillations measured in finite-width superconducting mesoscopic rings with input and output stubs and in patterned films. The transmission model [1] explaining the sinusoidal oscillation of magnetoresistance is extended to address the background as a function of the magnetic field. Apart from the interference mechanism activated by the ring, pinned superconducting vortices as topological defects introduce a further interference-based distribution of supercurrents that affects, in turn, the voltmeter-sensed quasiparticles. The onset of vortices changes the topology of the superconducting state in a mesoscopic ring in a such a way that the full magnetoresistance dynamics can be interpreted owing to the interference of the constituents of the order parameter induced by both the ring itself and the vortex lattice in it.
[1] G. P. Papari and V. M. Fomin, Phys. Rev. B 105, 144511 (2022)