2003/12/11 by Kyle Shen, K. M. Shen, T. Yoshida +31 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.69.054503
published as Phys. Rev. B 69, 054503 (2003) · To appear in Phys. Rev. B
arxiv created 2003/12/11 · openalex publication_date 2004/02/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
The low-energy excitations of the lightly doped cuprates were studied by angle-resolved photoemission spectroscopy. A finite gap was measured over the entire Brillouin zone, including along the d_x2\ensuremath-y2 nodal line. This effect was observed to be generic to the normal states of numerous cuprates, including hole-doped La_2\ensuremath-xSrxCuO4 and Ca_2\ensuremath-xNaxCuO2Cl2 and electron-doped Nd_2\ensuremath-xCexCuO4. In all compounds, the gap appears to close with increasing carrier doping. We consider various scenarios to explain our results, including the possible effects of chemical disorder, electronic inhomogeneity, and a competing phase.