第271回物性セミナー



題目：Prediction and discovery of triplet supercurrents

in half metals

講師：Matthias Eschrig　氏 (Institut fuer Theoretische

Festkoerperphysik,Universitaet Karlsruhe, Germany)

日時：2006年4月3日（月）１５：００〜

場所：先端310W号室



講演要旨

Magnetism and superconductivity are competitive types of order in

correlated electron systems. In the case of a ferromagnet in

contact with a singlet superconductor, the importance of triplet

pairing correlations in the interface region recently became the

focus of research recently. Such triplet correlations have unusual

properties. They are typically odd in frequency for the case of

a diffusive material. For clean materials in addition a triplet

component even in frequency but odd in momentum is present. We

have predicted that such triplet correlations can lead to an

unconventional, indirect Josephson effect in a superconductor/

half-metal/superconductor structure. In a recent experiment

[Nature 439, 825, 2006] such an effect has been confirmed.



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