2016/10/31 by Simon Verret, S. Verret, M. Charlebois +4
Materials Science · Physics and Astronomy · #Condensed matter physics #Cuprate #Density of states #Density wave theory #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Mean field theory #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Superconductivity #Wave vector #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.95.054518
published as Phys. Rev. B 95, 054518 (2017) · 13 pages, 8 figures
arxiv created 2016/12/23 · openalex created_date 2017/01/06 · openalex publication_date 2017/02/28 · arxiv updated 2017/03/08 · openalex updated_date 2026/08/05
In scanning tunneling microscopy conductance curves, the superconducting gap of cuprates is sometimes accompanied by small subgap structures at very low energy. This was documented early on near vortex cores and later at zero magnetic field. Using mean-field toy models of coexisting d-wave superconductivity, d-form-factor density wave, and extended s-wave pair density wave (s^\ensuremath'PDW), we find agreement with this phenomenon, with s^\ensuremath'PDW playing a critical role. We explore the high variability of the gap structure with changes in band structure and density wave (DW) wave vector, thus explaining why subgap structures may not be a universal feature in cuprates. In the absence of nesting, nonsuperconducting results never show signs of pseudogap, even for large density wave magnitudes, therefore reinforcing the idea of a distinct origin for the pseudogap, beyond mean-field theory. Therefore, we also briefly consider the effect of DWs on a preexisting pseudogap.