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Sensors 2018, 18(11), 3790; https://doi.org/10.3390/s18113790

Real-Space Probing of the Local Magnetic Response of Thin-Film Superconductors Using Single Spin Magnetometry

1
Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
2
Physikalisches Institut and Center for Quantum Science (CQ) in LISA+, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 10 October 2018 / Revised: 31 October 2018 / Accepted: 1 November 2018 / Published: 6 November 2018
(This article belongs to the Special Issue Sensors Based on Quantum Phenomena)
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Abstract

We report on direct, real-space imaging of the stray magnetic field above a micro-scale disc of a thin film of the high-temperature superconductor YBa2Cu3O7−δ (YBCO) using scanning single spin magnetometry. Our experiments yield a direct measurement of the sample’s London penetration depth and allow for a quantitative reconstruction of the supercurrents flowing in the sample as a result of Meissner screening. These results show the potential of scanning single spin magnetometry for studies of the nanoscale magnetic properties of thin-film superconductors, which could be readily extended to elevated temperatures or magnetic fields. View Full-Text
Keywords: london penetration depth; meissner effect; quantum sensing; nitrogen-vacancy center; scanning probe microscopy london penetration depth; meissner effect; quantum sensing; nitrogen-vacancy center; scanning probe microscopy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Rohner, D.; Thiel, L.; Müller, B.; Kasperczyk, M.; Kleiner, R.; Koelle, D.; Maletinsky, P. Real-Space Probing of the Local Magnetic Response of Thin-Film Superconductors Using Single Spin Magnetometry. Sensors 2018, 18, 3790.

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