| Issue |
Europhys. Lett.
Volume 54, Number 3, May 2001
|
|
|---|---|---|
| Page(s) | 394 - 400 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00107-2 | |
| Published online | 01 December 2003 | |
Quantum spin fluctuations as a source of long-range proximity effects in diffusive ferromagnet-super conductor structures
1
Department of Applied Physics, Chalmers University
of Technology and Göteborg University -
SE-412 96 Göteborg, Sweden
2
B. I. Verkin Institute for Low Temperature Physics
& Engineering National Academy of Science of
Ukraine - 47 Lenin Ave. 310164 Kharkov, Ukraine
Received:
12
January
2001
Accepted:
19
February
2001
We show that quantum spin fluctuations in inhomogeneous 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 non-magnetic materials, but anomalously large for ferromagnets.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.80.Fp – Point contacts; SN and SNS junctions / 85.35.Ds – Quantum interference devices
© EDP Sciences, 2001
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