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Non-reciprocity of vortex-limited critical current in conventional superconducting micro-bridges

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2022

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Suri, Dhavala
Meier, Thomas N. G.
Kronseder, Matthias
Back, Christian H.
Strunk, Christoph

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European Union (EU): 964398

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Applied Physics Letters. American Institute of Physics (AIP). 2022, 121, 102601. ISSN 0003-6951. eISSN 1077-3118. Available under: doi: 10.1063/5.0109753

Zusammenfassung

Non-reciprocity in the critical current has been observed in a variety of superconducting systems and has been called the superconducting diode effect. The origin underlying the effect depends on the symmetry breaking mechanisms at play. We investigate superconducting micro bridges of NbN and also NbN/magnetic insulator (MI) hybrids. We observe a large diode efficiency of ≈ 30% when an out-of-plane magnetic field as small as 25 mT is applied. In both NbN and NbN/MI hybrid, we find that the diode effect vanishes when the magnetic field is parallel to the sample plane. Our observations are consistent with the critical current being determined by the vortex surface barrier. Unequal barriers on the two edges of the superconductor strip result in the diode effect. Furthermore, the rectification is observed up to a temperature ∼10 K, which makes the device potential for diode based applications over larger temperature range than before.

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530 Physik

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Superconductivity, Vortex dynamics, superconductors, Current-voltage characteristic

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ISO 690SURI, Dhavala, Akashdeep KAMRA, Thomas N. G. MEIER, Matthias KRONSEDER, Wolfgang BELZIG, Christian H. BACK, Christoph STRUNK, 2022. Non-reciprocity of vortex-limited critical current in conventional superconducting micro-bridges. In: Applied Physics Letters. American Institute of Physics (AIP). 2022, 121, 102601. ISSN 0003-6951. eISSN 1077-3118. Available under: doi: 10.1063/5.0109753
BibTex
@article{Suri2022Nonre-58523,
  year={2022},
  doi={10.1063/5.0109753},
  title={Non-reciprocity of vortex-limited critical current in conventional superconducting micro-bridges},
  volume={121},
  issn={0003-6951},
  journal={Applied Physics Letters},
  author={Suri, Dhavala and Kamra, Akashdeep and Meier, Thomas N. G. and Kronseder, Matthias and Belzig, Wolfgang and Back, Christian H. and Strunk, Christoph},
  note={Article Number: 102601}
}
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