Quantum Institute: Visitor Schedule

The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.
For more information, contact Diego Dalvit.

September 13, 2007
Thursday, 12:30PM to 2 PM
T-DO Conference Room, TA-3-123-121

K.B. Efetov,
Theoretische Physik III, Ruhr-Universitt Bochum and L.D. Landau Institute for Theoretical Physics

Long-Range Proximity Effects In Superconductor/Ferromagnet Heterostructures

Abstract

Novel unusual effects in superconductor-ferromagnet (S/F) heterostructures are considered. The main attention is paid to the triplet component of the superconducting condensate generated in these systems due to the presence of the ferromagnet. This component is odd in frequency and even in the momentum, which makes it insensitive to non-magnetic impurities. The triplet component is not destroyed even by a strong exhange field and can penetrate the ferromagnet over long distances. In its turn, the ferromagnet moment can be induced in the superconductor on distances of the order of the superconducting coherence length, which may be classified as inverse proximity effect. The penetration of the magnetic moment into the superconductor can reduce the magnetic moment, thus providing one more mechanism of the screening in addition to the Meissner effect. A comparison of the theoretical predictions with existing experiments is made.