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

Yaojia Wang; Shuo Ying Yang; Pranava K. Sivakumar; Brenden R. Ortiz; Samuel M.L. Teicher; Heng Wu; Abhay K. Srivastava; Chirag Garg; Defa Liu; Stuart S.P. Parkin; Eric S. Toberer; Tyrel McQueen; Stephen D. Wilson; Mazhar N. Ali

doi:10.1126/sciadv.adg7269

Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K_1-xV₃Sb₅

Yaojia Wang, Shuo Ying Yang, Pranava K. Sivakumar, Brenden R. Ortiz, Samuel M.L. Teicher, Heng Wu, Abhay K. Srivastava, Chirag Garg, Defa Liu, Stuart S.P. Parkin, Eric S. Toberer, Tyrel McQueen, Stephen D. Wilson, Mazhar N. Ali

Correlated Electron Materials

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

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 K_1-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 K_1-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 fromedge states. These observations pave the way for studying unconventional superconductivity and Josephson device based on Kagome metals with electron correlation and topology.

Original language	English
Article number	eadg7269
Journal	Science Advances
Volume	9
Issue number	28
DOIs	https://doi.org/10.1126/sciadv.adg7269
State	Published - Jul 2023

Funding

Acknowledgments:W ethankF .GaoandJ.-C.Jeonforthesupportduringdevicefabrication andG.-H.LeeandV .K.T .Lawandforvaluablediscussions.Funding:M.N.A.acknowledgesthat this research was principally supported by the Alexander von Humboldt Foundation Sofia Kovalevskaja A ward, the German Federal Ministry of Education and Research\u2019s MINERV A ARCHESA ward,andtheMaxPlanckSociety.Y .W .acknowledgesthesupportfromNWOTalent ProgrammeVenifinancedbytheDutchResearchCouncil(NWO),projectno.VI.Veni.212.146. S.D.W ., B.R.O.,andS.M.L.T .acknowledgesupportfromtheUniversityofCaliforniaSantaBarbara We thank F. Gao and J.-C. Jeon for the support during device fabrication and G.-H. Lee and V. K. T. Law and for valuable discussions. Funding: M.N.A. acknowledges that this research was principally supported by the Alexander von Humboldt Foundation Sofia Kovalevskaja Award, the German Federal Ministry of Education and Research\u2019s MINERVA ARCHES Award, and the Max Planck Society. Y.W. acknowledges the support from NWO Talent Programme Veni financed by the Dutch Research Council (NWO), project no. VI.Veni.212.146. S.D.W., B.R.O., and S.M.L.T. acknowledge support from the University of California Santa Barbar Quantum Foundry, funded by the National Science Foundation (NSF DMR-1906325). Research reported here also made use of shared facilities of the UCSB MRSEC (NSF DMR-1720256). B.R.O. also acknowledges support from the California NanoSystems Institute through the Elings fellowship program. S.M.L.T. has been supported by the National Science Foundation Graduate Research Fellowship Program under grant no. DGE-1650114. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. D.L. acknowledges support from the Alexander von Humboldt Foundation. S.S.P.P. acknowledges the European Research Council (ERC) under the European Union\u2019s Horizon 2020 research and innovation programme (grant agreement no. 670166), Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)-project number 314790414, and Alexander von Humboldt Foundation in the framework of the Alexander von Humboldt Professorship endowed by the Federal Ministry of Education and Research. T.M. acknowledges the David and Lucile Packard Foundation and the Johns Hopkins University Catalyst Award. E.S.T. acknowledges support of NSF DMR 1555340. QuantumFoundry,fundedbytheNationalScienceFoundation(NSFDMR-1906325).Research reportedherealsomadeuseofsharedfacilitiesoftheUCSBMRSEC(NSFDMR-1720256).B.R.O. alsoacknowledgessupportfromtheCaliforniaNanoSystemsInstitutethroughtheElings fellowshipprogram.S.M.L.T .hasbeensupportedbytheNationalScienceFoundationGradua te ResearchFellowshipProgramundergrantno.DGE-1650114.Anyopinions,findings,and conclusionsorrecommendationsexpressedinthismaterialarethoseoftheauthorsanddonot necessarilyreflecttheviewsoftheNationalScienceFoundation.D.L.acknowledgessupport fromtheAlexandervonHumboldtFoundation.S.S.P .P .acknowledgestheEuropeanResearch Council (ERC) under the European Union\u2019s Horizon 2020 research and innovation programme (grantagreementno.670166),DeutscheForschungsgemeinschaft(DFG,GermanResearch Foundation)\u2014projectnumber314790414,andAlexandervonHumboldtFoundationinthe frameworkoftheAlexandervonHumboldtProfessorshipendowedbytheFederalMinistryof EducationandResearch.T .M. acknowledgestheDavidandLucilePa ckard Foundationandthe JohnsHopkinsUniversityCatalystA ward.E.S.T .acknowledgessupportofNSFDMR1555340.

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Wang, Y., Yang, S. Y., Sivakumar, P. K., Ortiz, B. R., Teicher, S. M. L., Wu, H., Srivastava, A. K., Garg, C., Liu, D., Parkin, S. S. P., Toberer, E. S., McQueen, T., Wilson, S. D., & Ali, M. N. (2023). Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K_1-xV₃Sb₅. Science Advances, 9(28), Article eadg7269. https://doi.org/10.1126/sciadv.adg7269

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

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 fromedge states. These observations pave the way for studying unconventional superconductivity and Josephson device based on Kagome metals with electron correlation and topology.",

author = "Yaojia Wang and Yang, {Shuo Ying} and Sivakumar, {Pranava K.} and Ortiz, {Brenden R.} and Teicher, {Samuel M.L.} and Heng Wu and Srivastava, {Abhay K.} and Chirag Garg and Defa Liu and Parkin, {Stuart S.P.} and Toberer, {Eric S.} and Tyrel McQueen and Wilson, {Stephen D.} and Ali, {Mazhar N.}",

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year = "2023",

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doi = "10.1126/sciadv.adg7269",

language = "English",

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T1 - Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K1-xV3Sb5

AU - Wang, Yaojia

AU - Yang, Shuo Ying

AU - Sivakumar, Pranava K.

AU - Ortiz, Brenden R.

AU - Teicher, Samuel M.L.

AU - Wu, Heng

AU - Srivastava, Abhay K.

AU - Garg, Chirag

AU - Liu, Defa

AU - Parkin, Stuart S.P.

AU - Toberer, Eric S.

AU - McQueen, Tyrel

AU - Wilson, Stephen D.

AU - Ali, Mazhar N.

PY - 2023/7

Y1 - 2023/7

N2 - 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 fromedge states. These observations pave the way for studying unconventional superconductivity and Josephson device based on Kagome metals with electron correlation and topology.

AB - 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 fromedge states. These observations pave the way for studying unconventional superconductivity and Josephson device based on Kagome metals with electron correlation and topology.

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Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K_1-xV₃Sb₅

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