Negative four-terminal resistance as a probe of crossed Andreev reflection

Details Negative four-terminal resistance as a probe of crossed Andreev reflection Negative four-terminal resistance as a probe of crossed Andreev reflection

2006-09-29

arxiv.org/abs/cond-mat/0609766v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures, revtex

Scientific paper

We report on the experimental investigation of electronic transport in
superconductor-ferromagnet spin-valve structures. Our samples consist of two
ferromagnetic iron leads forming planar tunnel contacts to a superconducting
aluminum wire. At energies below the superconducting gap, we observe a negative
four-probe resistance that can be explained by crossed Andreev reflection.

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