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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

To clarify the order parameter symmetry of cuprates, the magnetic penetrationdepth $\lambda$ was measured along the crystallographic directions $a$, $b$,and $c$ in single crystals of YBa$_2$Cu$_4$O$_8$ via muon spin rotation. Thismethod is direct, bulk sensitive, and unambiguous. The temperature dependencesof $\lambda_a^{-2}$ and $\lambda_b^{-2}$ exhibit an inflection point at lowtemperatures as is typical for two-gap superconductivity (TGS) with $s+d-$wavecharacter in the planes. Perpendicular to the planes a pure s-wave gap isobserved thereby highlighting the important role of c-axis effects. We concludethat these are generic and universal features in the bulk of cuprates.

s-wave symmetry along the c-axis and s+d in-plane superconductivity in bulk YBa_2Cu_4O_8