English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Josephson current between two superconductors provides a phase sensitive toolfor probing their pairing symmetries. Here we fabricate and studyexperimentally high-quality Josephson junctions between a conventional s-wavesuperconductor Nb and a multi-band iron-pnictide Ba$_{1-x}$Na$_x$Fe$_2$As$_2$.Junctions exhibit a large enough critical current density to preclude thed-wave symmetry of the order parameter in the pnictide. However, the $I_cR_n$product is very small $\simeq 3~\mu$V, which is not consistent with thesign-preserving $s_{++}$ symmetry either. We argue that the small $I_cR_n$value along with its unusual temperature dependence provide evidence for the$s_{\pm}$ symmetry of the order parameter in Ba$_{1-x}$Na$_x$Fe$_2$As$_2$. Weconclude that it is the phase sensitivity of our junctions that leads to analmost complete (bellow a sub-percent) cancellation of opposite supercurrentsfrom the sign-reversal $s_{\pm}$ bands in the pnictide.

physical review letters

Phase-sensitive evidence for the sign-reversal s+- symmetry of the order  parameter in an iron-pnictide superconductor using Nb/Ba1-xNaxFe2As2  Josephson junctions