Magnetic hysteresis effects in superconducting coplanar microwave resonators

D. Bothner, T. Gaber, M. Kemmler, D. Koelle, R. Kleiner, S. Wünsch, and M. Siegel
Phys. Rev. B 86, 014517 – Published 20 July 2012

Abstract

We performed transmission spectroscopy experiments on coplanar half-wavelength niobium resonators at temperature T=4.2K. We observe not only a strong dependence of the quality factor Q and the resonance frequency fres on an externally applied magnetic field but also on the magnetic history of our resonators, i.e., on the spatial distribution of trapped Abrikosov vortices in the device. This is valid for a broad range of frequencies and angles between the resonator plane and the magnetic field direction and holds for resonators with and without antidots near the edges of the center conductor and the ground planes. In a detailed analysis, we show that characteristic features of the experimental data can only be reproduced by calculations if we assume a highly inhomogeneous rf current density and a flux density gradient with maxima at the edges of the superconductor. We furthermore demonstrate that the hysteretic behavior of the resonator properties can be used to considerably reduce the vortex-induced losses and to fine-tune the resonance frequency by the proper way of cycling to a desired magnetic field value.

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  • Received 27 February 2012

DOI:https://doi.org/10.1103/PhysRevB.86.014517

©2012 American Physical Society

Authors & Affiliations

D. Bothner*, T. Gaber, M. Kemmler, D. Koelle, and R. Kleiner

  • Physikalisches Institut–Experimentalphysik II and Center for Collective Quantum Phenomena in LISA+, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany

S. Wünsch and M. Siegel

  • Institut für Mikro- und Nanoelektronische Systeme, Karlsruher Institut für Technologie, Hertzstrasse 16, 76187 Karlsruhe, Germany

  • *daniel.bothner@uni-tuebingen.de

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Issue

Vol. 86, Iss. 1 — 1 July 2012

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