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

The London model describes strongly type-2 superconductors as massive vectorfield theories, where the magnetic field decays exponentially at the lengthscale of the London penetration length. This also holds for isotropicmulti-band extensions, where the presence of multiple bands merely renormalisesthe London penetration length. We show that, by contrast, the magneticproperties of anisotropic multi-band London models are not this simple, and theanisotropy leads to the inter-band phase differences becoming coupled to themagnetic field. This results in the magnetic field in such systems having N+1penetration lengths, where N is the number of field components or bands. Thatis, in a given direction, the magnetic field decay is described by N+1 modeswith different amplitudes and different decay length scales. For certainanisotropies we obtain magnetic modes with complex masses. That means thatmagnetic field decay is not described by a monotonic exponential increment setby a real penetration length but instead is oscillating. Some of thepenetration lengths are shown to diverge away from the superconducting phasetransition when the mass of the phase-difference mode vanishes. Finally theanisotropy-driven hybridization of the London mode with the Leggett modes canprovide an effectively non-local magnetic response in the nominally localLondon model. Focusing on the two-component model, we discuss the magneticfield inversion that results from the effective non-locality, both near thesurface of the superconductor and around vortices. In the regime where themagnetic field decay becomes non-monotonic, the multiband London superconductoris shown to form weakly-bound states of vortices.

Non-London electrodynamics in a multiband London model: anisotropy-induced non-localities and multiple magnetic field penetration lengths