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

Abstract

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.

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

References in corpus (7)

• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Theory of the proximity effect in junctions with unconventional superconductors
• Manifestation of the odd-frequency spin-triplet pairing state in diffusive ferromagnet / superconductor junctions
• Superharmonic Josephson relation at 0-/$\pi$-junction transition
• Theory of Josephson effect in unconventional superconducting junctions with diffusive barriers
• Conductance of a junction between a normal metal and a Berezinskii superconductor
• Spin-flip scattering and non-ideal interfaces in dirty ferromagnet/superconductor junctions

Cited by in corpus (3)

• Theory of superconducting and magnetic proximity effect in S$\mid$F structures with inhomogeneous magnetization textures and spin-active interfaces
• Josephson current in diffusive multilayer superconductor/ferromagnet/superconductor junctions
• Proximity effect in ferromagnet/superconductor hybrids: from diffusive to ballistic motion