2014/02/17 by Damian Rybicki, Rybicki, Damian, Michael Jurkutat +5
Chemistry · Materials Science · Physics and Astronomy · #Advanced NMR Techniques and Applications #FOS: Physical sciences #Magnetism in coordination complexes #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.1402.4014
openalex publication_date 2014/02/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The phase diagram of the superconducting cuprates is often used to show how their electronic properties change as a function of the mean doping level, i.e., the average hole content of the CuO2 plane. In Nuclear Magnetic Resonance (NMR) experiments average doping, as well as the distribution of these holes between planar Cu and O reveals itself through the quadrupole splittings of the 63,65Cu and 17O NMR. Here we argue based on all published NMR data available to us in favor a new type of phase diagram that has the planar oxygen quadrupole splitting and with it the planar oxygen hole content as abscissa rather than the average hole content of the CuO2 plane. In such a plot the superconducting domes of the different cuprate families are shifted horizontally according to their maximum critical temperature T\rm c,max set by the chemistry of the parent material, which determines its oxygen hole content. The higher the O hole content the higher T\rm c,max that can be achieved by actual doping. These findings also offer a strategy for finding cuprates with higher T\rm c,max.