Triplet superconducting proximity effect in nonhomogeneous magnetic materials
A. Kadigrobov2
B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Science of Ukraine 47 Lenin Ave., Kharkov, 61103, Ukraine
E-mail: kadig@kam.kharkov.ua
R. I. Shekhter, and M. Jonson
2Department of Applied Physics, Chalmers University of Technology and Göteborg University SE-412 96 Göteborg, Sweden
Received May 14, 2001
Аннотация
We show that quantum spin fluctuations in inhomogeneous conducting ferromagnets drastically affect the Andreev reflection of electrons and holes at a ferromagnet-superconductor interface. As a result, a strong long-range proximity effect appears, associated with electron-hole spin triplet correlations
and persisting on a length scale typical for nonmagnetic materials but anomalously large for
ferromagnets. For applications, an important consequence is that this long-range proximity effect
permits to create superconducting quantum intetference devices with the Josephson magnetic junction of
an anomalous large length.
74.50.+r - Tunneling phenomena; point contacts, weak links, Josephson effects (for SQUIDs, see 85.25.Dq; for Josephson devices, see 85.25.Cp; for Josephson junction arrays, see 74.81.Fa)
74.80.Fp -
85.30.St -
