Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K 1- x V 3 Sb 5 .

Autor: Wang Y; Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany.; Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands., Yang SY; Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany., Sivakumar PK; Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany., Ortiz BR; Materials Department, University of California Santa Barbara, Santa Barbara, CA 93106, USA., Teicher SML; Materials Department, University of California Santa Barbara, Santa Barbara, CA 93106, USA., Wu H; Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany.; Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands., Srivastava AK; Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany., Garg C; Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany.; IBM Almaden Research Center, San Jose, CA 95120, USA., Liu D; Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany.; Department of Physics, Beijing Normal University, Beijing 100875, China., Parkin SSP; Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany., Toberer ES; Colorado School of Mines, Goldon, CO 80401, USA., McQueen T; Johns Hopkins University, Baltimore, MD 21218, USA., Wilson SD; Materials Department, University of California Santa Barbara, Santa Barbara, CA 93106, USA., Ali MN; Max Planck Institute of Microstructure Physics, 06108 Halle, Saxony-Anhalt, Germany.; Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2023 Jul 14; Vol. 9 (28), pp. eadg7269. Date of Electronic Publication: 2023 Jul 12.
DOI: 10.1126/sciadv.adg7269
Abstrakt: Materials with Kagome nets are of particular importance for their potential combination of strong correlation, exotic magnetism, and electronic topology. KV 3 Sb 5 was discovered to be a layered topological metal with a Kagome net of vanadium. Here, we fabricated Josephson Junctions of K 1- x V 3 Sb 5 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 K 1- x V 3 Sb 5 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.
Databáze: MEDLINE
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