$π-$shifted magnetoconductance oscillations in mesoscopic superconducting-normal-heterostructures

Details $π-$shifted magnetoconductance oscillations in mesoscopic superconducting-normal-heterostructures $π-$shifted magnetoconductance oscillations in mesoscopic superconducting-normal-heterostructures

1998-03-27

arxiv.org/abs/cond-mat/9803339v1

Physics

Condensed Matter

Superconductivity

4 Pages, 5 postscript figures. Submitted to Phys. Rev. Lett

Scientific paper

Interference of proximity induced superconducting correlations in mesoscopic metallic rings is sensitive to the magnetic flux $\Phi$ inside these rings. This is the reason for magnetoconductance oscillations in such systems. We detected experimentally and explained theoretically a novel effect: the phase of these oscillations can switch between 0 and $\pi$ depending on the resistance of intermetallic interfaces and temperature. The effect is due to a nontrivial interplay between the proximity induced enhancement of the local conductivity and the proximity induced suppression of the density of states at low energies.

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