Josephson Effect due to Odd-Frequency Pairs in Diffusive Half Metals
Yasuhiro Asano, Yukio Tanaka, Alexander A. Golubov
DOI 10.1103/PhysRevLett.98.107002 · Physical Review Letters
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Abstract
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.
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