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

A long excitation coil piercing a superconducting (SC) ring is used togenerate ever increasing persistent current in the ring, until the currentdestroys the order parameter. Given that the penetration depth $\lambda$ isknown, this experiment measures, hypothetically, the coherence length $\xi$,hence the name "Xiometer". We examine various aspects of this theoreticallydriven hypothesis by testing niobium rings with different dimensions, and bycomparing the results to the known values of $\xi$. We then apply the method totwo La$_{1.875}$Sr$_{0.125}$CuO$_4$ rings at $T \rightarrow 0$. In one, thecurrent flows in the CuO$_2$ planes hence it is set by $\xi_{ab}$. In theother, the current must cross planes and is determined by $\xi_{c}$. We findthat $\xi_{c}=1.3 \pm 0.1$~nm, and $\xi_{ab}<2.3~$nm indicating that at lowtemperatures the Cooper pairs are three dimensional.

The Ground-state Inter-plane Superconducting Coherence Length of La$_{1.875}$Sr$_{0.125}$CuO$_4$ Measured by a "Xiometer"