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Josephson Effect due to Odd-frequency Pairs in Diffusive Half Metals

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arxiv cond-mat/0609566 v1 pith:YT2E2PSQ submitted 2006-09-22 cond-mat.supr-con

Yasuhiro Asano , Yukio tanaka , Alexander Golubov This is my paper · ORCID
classification cond-mat.supr-con
keywords josephsonsuperconductordiffusivehalfodd-frequencypairseffectenergy
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The Josephson effect in superconductor / diffusive ferromagnet / superconductor (SFS) junctions is studied using the recursive Green function method in the regime of large exchange energy in a ferromagnet. Motivated by recent experiment [R. S. Keizer, et. al., Nature 439, 825 (2006)] we also address the case of superconductor / diffusive half metal / superconductor junctions. The pairing function in spin-singlet and triplet channels, the Josephson current and their mesoscopic fluctuations are calculated. We show that 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 half metals has a large peak at the Fermi energy. Therefore odd-frequency pairs can be detected experimentally by using the scanning tunneling spectroscopy.

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    In 1D SF1F2S Josephson junctions, a barrier at the F1/F2 interface creates critical-current resonance peaks at Q_i d_i = (n_i + 1/2)π, attributed to zero-spin-projection triplet pairs, with accumulated phase setting t...

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