Negative Magnetoresistance in Andreev Interferometers

Details Negative Magnetoresistance in Andreev Interferometers Negative Magnetoresistance in Andreev Interferometers

2002-03-26

arxiv.org/abs/cond-mat/0203546v1

Phys. Rev. B 66, 220505 (2002)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, revtex4

Scientific paper

10.1103/PhysRevB.66.220505

We consider transport in a diffusive cross-shaped Andreev interferometer geometry, both theoretically and experimentally. A strong and unexpected modulation of the conductance with the superconducting phase is found. In particular, a reversed resistance vs. phase difference is predicted, where the resistance is decreased by a phase gradient. A comparison of our quasiclassical calculation with experimental data shows quantitative agreement if we account for diamagnetic screening.

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