2005/10/19 by Qingshan Yuan, Feng Yuan, C. S. Ting · 26 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Band gap #Condensed matter physics #Cuprate #Doping #Electron #Excitation #Fermi surface #Magnetism in coordination complexes #Pairing #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quasiparticle #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.73.054501
published in Physical Review B 73(5) (American Physical Society) · 5 pages, 4 figures
arxiv created 2005/10/19 · openalex publication_date 2006/02/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We argue that the experimentally observed nonmonotonic gap in electron-doped cuprates at optimal doping is the lowest quasiparticle excitation energy in the coexisting antiferromagnetic (AF) and superconducting (SC) state. The idea is implemented by studying the coexistence of AF and SC orders with the t\text\ensuremath-t^\ensuremath'\text\ensuremath-t^\ensuremath''\text\ensuremath-J model. Although the pairing gap itself is assumed to be the simplest d wave which is monotonic, we have found that the quasiparticle excitation gap in the coexisting state is nonmonotonic, with the maxima around the hot spots where the Fermi surface is missing due to the AF gap. Within the same framework of the coexisting state the spectral function is also calculated at optimal doping. The obtained results are all qualitatively consistent with experiments.