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

被引：28
|
作者：
Beckmann, D.
Loehneysen, H. V.
机构：
[1] Forschungszentrum Karlsruhe, Inst Nanotechnol, D-76021 Karlsruhe, Germany
[2] Forschungszentrum Karlsruhe, Inst Festkorperphys, D-76021 Karlsruhe, Germany
[3] Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2007年 / 89卷 / 03期
关键词：
D O I：
10.1007/s00339-007-4193-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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. Current is injected into one of the contacts while the voltage is monitored at the other, thus defining a four-probe resistance. At energies below the superconducting gap, we observe a negative four-probe resistance that can be explained by crossed Andreev reflection.
引用
收藏
页码：603 / 607
页数：5
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