Diamagnetic response of mesoscopic superconducting rings above Tc
Vinay Ambegaokar, Ulrich Eckern
DOI 10.1103/PhysRevB.44.10358 · Physical Review B
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Abstract
Various small effects that might appear to be obstacles in the way of measuring the persistent current in a mesoscopic ring of a superconductor above but close to Tc are investigated, among them the effect of the magnetic field penetrating into the metal, the Zeeman splitting, and the inductance of the ring. Analogies and differences with a (single-junction) superconducting quantum interference device (SQUID) are pointed out, the differences being due to the high harmonic content of the current flux relation. Typical parameter values make flux trapping virtually impossible.
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