Josephson effect due to odd-frequency pairs in diffusive half metals.
Motivated by a recent experiment [Keizer et al., Nature (London) 439, 825 (2006)], we study the Josephson effect in superconductor/diffusive half metal/superconductor junctions using the recursive Green function method. The spin-flip scattering at the junction interfaces opens the Josephson channel of the odd-frequency spin-triplet Cooper pairs. As a consequence, the local density of states in a half metal has a large peak at the Fermi energy. Therefore the odd-frequency pairs can be detected experimentally by using the scanning tunneling spectroscopy.
Asano
Yasuhiro
Y
Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan.
Tanaka
Yukio
Y
Golubov
Alexander A
AA