Identifying the odd-frequency superconducting state by a field-induced Josephson effect

Details Identifying the odd-frequency superconducting state by a field-induced Josephson effect Identifying the odd-frequency superconducting state by a field-induced Josephson effect

2007-12-02

arxiv.org/abs/0712.0134v2

Phys. Rev. B 77, 174507 (2008)

Physics

Condensed Matter

Superconductivity

10 pages, 7 figures. To appear in Physical Review B

Scientific paper

10.1103/PhysRevB.77.174507

Superconducting order parameters that are odd under exchange of time-coordinates of the electrons constituting a Cooper-pair, are potentially of great importance both conceptually and technologically. Recent experiments report that such an odd-frequency superconducting {\it bulk} state may be realized in certain heavy-fermion compounds. While the Josephson current normally only flows between superconductors with the same symmetries with respect to frequency, we demonstrate that an exchange field may induce a current between diffusive even- and odd-frequency superconductors. This suggests a way to identify the possible existence of bulk odd-frequency superconductors.

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