2010/11/30 by Qinghong Cui, Chia-Ren Hu, C. -R. Hu +2
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.85.014503
published as Phys. Rev. B 85, 014503 (2012) · 8 pages, 5 figures; version as published
openalex publication_date 2012/01/17 · arxiv created 2012/01/24 · arxiv updated 2012/01/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Using a discrete-lattice approach, we calculate the conductance spectra between a normal metal and an s-wave Larkin-Ovchinnikov (LO) superconductor, with the junction interface oriented along the direction of the order-parameter (OP) modulation. The OP sign reversal across one single nodal line can induce a sizable number of zero-energy Andreev bound states around the nodal line, and a hybridized midgap-states band is formed amid a momentum-dependent gap as a result of the periodic array of nodal lines in the LO state. This band-in-gap structure and its anisotropic properties give rise to distinctive features in both the point-contact and tunneling spectra as compared with the BCS and Fulde-Ferrell cases. These spectroscopic features can serve as distinguishing signatures of the LO state.