Abstract
In order to investigate the symmetry of a superconducting (SC) pairing state in a staggered field, we solve the linearized Iliashberg's equation based on the random phase approximation and the fluctuation exchange approximation in the Hubbard model under a staggered field. We show that an odd-frequency spin-triplet (equal-spin) s-wave pairing state can be realized in the system. It is caused by the fact that the staggered field suppresses the in-plane spin susceptibility and enhances the charge susceptibility. The latter is due to a spin-dependent modulation in the electron density. The result suggests that the antiferromagnetic (AF) background gives a contribution inherently different from the AF spin fluctuation to SC pairing state.
Original language | English |
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Article number | 224509 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 85 |
Issue number | 22 |
DOIs | |
Publication status | Published - Jun 7 2012 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics