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Influence of the Fermi surface geometry on the Josephson effect between iron-pnictide and conventional superconductors
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Institute of Metal Physics of National Academy of Sciences of Ukraine, Ukraine; Kyiv Academic University, Ukraine.ORCID-id: 0000-0002-7212-434X
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.ORCID-id: 0000-0003-4815-5856
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Moscow Institute of Physics and Technology, Russia.ORCID-id: 0000-0002-3131-8658
Rekke forfattare: 42021 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 103, nr 21, artikkel-id 214507Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We study hybrid Josephson junctions between a multiband Ba1-xNaxFe2As2 iron-pnictide and Nb. We observe that the insertion of a Cu interlayer in such junctions leads to a dramatic enhancement of the IcRn product, despite the weaker proximity-induced superconductivity of Cu. This counterintuitive phenomenon is attributed to the differences in Fermi surface geometries of Nb and Cu, which affect the selectivity of tunneling in sign-reversal s± bands of pnictide. Our results indicate that the sensitivity to Fermi surface geometries provides a new tool for phase-sensitive studies and paves the way to conscious Fermi surface engineering of pnictide junctions.

sted, utgiver, år, opplag, sider
2021. Vol. 103, nr 21, artikkel-id 214507
Emneord [en]
Unconventional superconductivity, Tunneling phenomena
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-196119DOI: 10.1103/PhysRevB.103.214507ISI: 000661190200005Scopus ID: 2-s2.0-85108204581OAI: oai:DiVA.org:su-196119DiVA, id: diva2:1590636
Tilgjengelig fra: 2021-09-03 Laget: 2021-09-03 Sist oppdatert: 2022-03-29bibliografisk kontrollert

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Kalenyuk, Aleksey A.Borodianskyi, Evgenii A.Krasnov, Vladimir M.

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