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Phase-Sensitive Evidence for the Sign-Reversal s(+/-) Symmetry of the Order Parameter in an Iron-Pnictide Superconductor Using Nb/Ba1-xNaxFe2As2 Josephson Junctions
Stockholm University, Faculty of Science, Department of Physics. Institute of Metal Physics of National Academy of Sciences of Ukraine, Ukraine.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 52018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, no 6, article id 067001Article in journal (Refereed) Published
Abstract [en]

Josephson current provides a phase-sensitive tool for probing the pairing symmetry. Here we present an experimental study of high-quality Josephson junctions between a conventional s-wave superconductor Nb and a multiband iron-pnictide Ba1-xNaxFe2As2. Junctions exhibit a large enough critical current density to preclude the d-wave symmetry of the order parameter in the pnictide. However, the IcRn product is very small. similar or equal to 3 mu V, which is not consistent with the sign-preserving s(++) symmetry either. We argue that the small IcRn value, along with its unusual temperature dependence, provides evidence for the sign-reversal s(+/-) symmetry of the order parameter in Ba1-xNaxFe2As2. We conclude that it is the phase sensitivity of our junctions that leads to an almost complete (below a subpercent) cancellation of supercurrents from sign-reversal bands in the pnictide.

Place, publisher, year, edition, pages
2018. Vol. 120, no 6, article id 067001
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Physical Sciences
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URN: urn:nbn:se:su:diva-153780DOI: 10.1103/PhysRevLett.120.067001ISI: 000424193100011PubMedID: 29481253OAI: oai:DiVA.org:su-153780DiVA, id: diva2:1191830
Available from: 2018-03-20 Created: 2018-03-20 Last updated: 2018-03-20Bibliographically approved

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Borodianskyi, Evgenii A.Kordyuk, A. A.Krasnov, Vladimir M.
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