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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
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2018, 18(11), 3790; https://doi.org/10.3390/s18113790
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)
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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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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