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Josephson effect due to odd-frequency pairs in diffusive half metals.

Yasuhiro Asano¹, Yukio Tanaka, Alexander A Golubov

¹Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan.

Physical Review Letters

|March 16, 2007

Summary

We investigated the Josephson effect in superconductor/diffusive half metal/superconductor junctions. Odd-frequency spin-triplet Cooper pairs, enabled by spin-flip scattering, create a detectable peak in the half metal

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Phenomena

Background:

Recent experiments have explored Josephson effects in novel material junctions.
Superconductor/diffusive half metal/superconductor (S/HM/S) junctions present unique electronic properties.

Purpose of the Study:

To investigate the Josephson effect in S/HM/S junctions.
To understand the role of spin-flip scattering at interfaces.
To explore the transport of odd-frequency spin-triplet Cooper pairs.

Main Methods:

Utilizing the recursive Green function method for theoretical analysis.
Modeling spin-flip scattering at the superconductor-half metal interfaces.

Main Results:

Spin-flip scattering facilitates the Josephson channel for odd-frequency spin-triplet Cooper pairs.
A significant peak in the local density of states at the Fermi energy is predicted for the half metal.
This phenomenon is linked to the transport of unconventional Cooper pairs.

Conclusions:

Odd-frequency spin-triplet Cooper pairs can be generated and transported in S/HM/S junctions.
The predicted peak in the local density of states offers an experimental signature.
Scanning tunneling spectroscopy is proposed as a method for detecting these exotic pairs.