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/

Zendy Plus

Presents the zaia usage as premium feature

ZAIA

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the access of premium content as premium feature

Premium Content

Zendy Tools

Zendy Open

The analisis of Pippard \cite{pip} for the growth of the normal phase intothe superconducting phase in the presence of a magnetic field $H>H_c$ isapplied in reverse to the case $H<H_c$ ($H_c=$critical magnetic field). Wecarry out the analysis both for a planar and a cylindrical geometry. As thesuperconducting phase grows into the normal phase, a supercurrent is generatedat the superconductor-normal phase boundary that flows in direction opposite tothe Faraday electric field resulting from the moving phase boundary. Thissupercurrent motion is in direction opposite to what is dictated by the Lorentzforce on the current carriers, and in addition requires that mechanicalmomentum of opposite sign be tranferred to the system as a whole to ensuremomentum conservation. In the cylindrical geometry case, a macroscopic torqueof unknown origin acts on the body as a whole as the magnetic field isexpelled. We argue that the conventional BCS-London theory of superconductivitycannot explain these facts, and that as a consequence the Meissner effectremains unexplained within the conventional theory of superconductivity. Wepropose that the Meissner effect can only be understood by assuming that thereis motion of charge in direction perpendicular to the normal-superconductorphase boundary and point out that the unconventional theory of holesuperconductivity describes this physics

Dynamics of the normal-superconductor phase transition and the puzzle of the Meissner effect