SUPERCONDUCTOR SCIENCE AND TECHNOLOGY (2006) 19-9:907 -911. Universal optimal hole-doping concentration in single-layer high- temperature cuprate superconductors

We argue that in cuprate physics there are two types, hole content per CuO2 plane (Ppl) and the corresponding hole content per unit volume (P3D), of holedoping concentrations for addressing physical properties that are two-dimensional (2D) and three-dimensional (3D) in nature, respectively. We find that superconducting transition temperature (Tc) varies systematically with P3D as a superconducting “dome” with a universal optimal hole-doping concentration P opt. 3D = 1.6 × 10 21 cm for single-layer high temperature superconductors. We suggest that P opt. 3D determines the upper bound of the electronic energy of underdoped single-layer high-Tc cuprates. PACS numbers: 74.72.-h, 74.25.Fy, 74.25.Dw Submitted to: Supercond. Sci. Technol. Universal optimal hole-doping concentration in single-layer HTSC 2