Phase-Sensitive Evidence for the Sign-Reversal s_{±} Symmetry of the Order Parameter in an Iron-Pnictide Superconductor Using Nb/Ba_{1-x}Na_{x}Fe_{2}As_{2} Josephson Junctions

Physical Review Letters
A A KalenyukV M Krasnov

Abstract

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 Ba_{1-x}Na_{x}Fe_{2}As_{2}. Junctions exhibit a large enough critical current density to preclude the d-wave symmetry of the order parameter in the pnictide. However, the I_{c}R_{n} product is very small ≃3μV, which is not consistent with the sign-preserving s_{++} symmetry either. We argue that the small I_{c}R_{n} value, along with its unusual temperature dependence, provides evidence for the sign-reversal s_{±} symmetry of the order parameter in Ba_{1-x}Na_{x}Fe_{2}As_{2}. 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.

References

Jan 1, 1995·Physical Review. B, Condensed Matter·A A GolubovM Y Kupriyanov
Jan 30, 2009·Nature·V B ZabolotnyyS V Borisenko
Apr 28, 2009·Physical Review Letters·M D LumsdenD Mandrus
Sep 28, 2010·Physical Review Letters·T GolodV M Krasnov
Nov 11, 2014·Nature Materials·S-H BaekB Büchner

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Citations

Jul 13, 2019·Physical Review Letters·Xiaoyu Zhu
Jun 12, 2021·Nano Letters·Taras GolodVladimir M Krasnov
Aug 28, 2021·Nanomaterials·Razmik A HovhannisyanVladimir M Krasnov

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