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

We present a study of the magnetic response of Type-II superconductivity inthe extreme pinning limit, where screening currents within an order ofmagnitude of the Ginzburg-Landau depairing critical current density developupon the application of a magnetic field. We show that this "super-hard" limitis well approximated in highly disordered, cold drawn, Nb and V wires whosemagnetization response is characterized by a cascade of Meissner-like phases,each terminated by a catastrophic collapse of the magnetization. Directmagneto-optic measurements of the flux penetration depth in the virginmagnetization branch are in excellent agreement with the exponential model inwhich J_c(B)=J_co exp(-B/B_o), where J_co~5x10^6 A/cm^2 for Nb. Theimplications for the fundamental limiting hardness of a superconductor arediscussed.Comment: corrected Fig.

Magneto-optical studies of flux penetration in super-hard Nb wire