Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K1-xV3Sb5

Title

Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K1-xV3Sb5

 Author

Wang, Y. (TU Delft QN/Ali Lab; Max Planck Institute of Microstructure Physics; Kavli institute of nanoscience Delft)
Yang, Shuo Ying (Max Planck Institute of Microstructure Physics)
Sivakumar, Pranava K. (Max Planck Institute of Microstructure Physics)
Ortiz, Brenden R. (University of California)
Teicher, Samuel M.L. (University of California)
Wu, H. (TU Delft QN/Ali Lab; Max Planck Institute of Microstructure Physics; Kavli institute of nanoscience Delft)
Srivastava, Abhay K. (Max Planck Institute of Microstructure Physics)
Garg, Chirag (Max Planck Institute of Microstructure Physics; IBM Almaden Research Center)
Ali, M.N. (TU Delft QN/Ali Lab; Max Planck Institute of Microstructure Physics; Kavli institute of nanoscience Delft)

Date

2023

 Abstract

Materials with Kagome nets are of particular importance for their potential combination of strong correlation, exotic magnetism, and electronic topology. KV3Sb5 was discovered to be a layered topological metal with a Kagome net of vanadium. Here, we fabricated Josephson Junctions of K1-xV3Sb5 and induced superconductivity over long junction lengths. Through magnetoresistance and current versus phase measurements, we observed a magnetic field sweeping direction-dependent magnetoresistance and an anisotropic interference pattern with a Fraunhofer pattern for in-plane magnetic field but a suppression of critical current for out-of-plane magnetic field. These results indicate an anisotropic internal magnetic field in K1-xV3Sb5 that influences the superconducting coupling in the junction, possibly giving rise to spin-triplet superconductivity. In addition, the observation of long-lived fast oscillations shows evidence of spatially localized conducting channels arising from edge states. These observations pave the way for studying unconventional superconductivity and Josephson device based on Kagome metals with electron correlation and topology.


 To reference this document use:

http://resolver.tudelft.nl/uuid:9aa427d9-f634-46ef-bab8-186dac3af2d7

 DOI

https://doi.org/10.1126/sciadv.adg7269

 ISSN

2375-2548

 Source

Science Advances, 9 (28), eadg7269

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2023 Y. Wang, Shuo Ying Yang, Pranava K. Sivakumar, Brenden R. Ortiz, Samuel M.L. Teicher, H. Wu, Abhay K. Srivastava, Chirag Garg, M.N. Ali, More Authors
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