https://doi.org/10.1140/epjb/e2013-40798-2
Regular Article
The electric “Meissner effect” in spin superconductor
1 International Center for Quantum
Materials, Peking University, Beijing
100871, P.R.
China
2 Collaborative Innovation Center of
Quantum Matter, Beijing
100871, P.R.
China
a e-mail: sunqf@pku.edu.cn
Received:
30
August
2013
Received in final form:
4
October
2013
Published online:
4
December
2013
Spin superconductivity results from the condensation of spin-triplet but charge neutral particles (e.g., triplet excitons). We present a Laplace-type equation describing electrostatic properties of spin superconductors. With the phenomenological equations obtained, we show that there exists an electric “Meissner effect” against the spatial variation of the electric field along the magnetic moment direction, in particular, (ŝ·∇)(ŝ·E). Several distinctive characteristics of this electric “Meissner effect” emerge in spin superconductors. Firstly, the variation of the electric field (ŝ·∇)(ŝ·E) has an abrupt decrease at the boundary, which is analogous to the screen effect for electric field E in a uniform dielectric material. Secondly, the super-spin current distributes inside or near the boundaries of a spin superconductor, which depends on the magnitude of gradient for the external driven electric field.
Key words: Mesoscopic and Nanoscale Systems
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2013
