The Josephson Effect in Single Spin Superconductors
Abstract
The Josephson Effect provides a primary signature of single spin superconductivity (SSS), the as yet unobserved superconducting state which was proposed recently as a low temperature phase of half-metallic antiferromagnets. These materials are insulating in the spin-down channel but are metallic in the spin-up channel. The SSS state is characterized by a unique form of p-wave pairing within a single spin channel. We develop the theory of a rich variety of Josephson effects that arise due to the form of the SSS order parameter. Tunneling is allowed at a SSS-SSS' junction but of course depends on the relative orientation of their order parameters. No current flows between an SSS and an s-wave BCS system due to their orthogonal symmetries, which potentially can be used to distinguish SSS from other superconducting states. Single spin superconductors also offer a means to probe other materials, where tunneling is a litmus test for any form of ``triplet'' order parameter.
Keywords
Cite
@article{arxiv.cond-mat/9806142,
title = {The Josephson Effect in Single Spin Superconductors},
author = {Robert E. Rudd and Warren E. Pickett},
journal= {arXiv preprint arXiv:cond-mat/9806142},
year = {2009}
}
Comments
4 pages, RevTeX, 2 PostScript figures included, to appear in J. Phys. and Chem. of Solids