Intraplanarcouplings in theCuO2 latticeof cuprate superconductors
نویسنده
چکیده
We have investigated the doping dependencies of the basal areas in single-layer high-Tc cuprates La2−xSrxCuO4 and HgBa2CuOx, as well as in two-layer Y1−yCayBa2Cu3Ox and HgBa2CaCu2Ox. The basal areas not only tend to shrink on hole doping, as expected from single electron quantum chemistry, but exhibit also a “bulge” around optimum doping. We attribute the “bulge” to the effects of the strongly correlated quantum liquid on the CuO2 lattice, rendering it nearly incompressible around optimum doping, but highly compressible in the weakly overdoped regime. Inhomogenous doping cannot account for this anomaly in the electronic compressibility of the CuO2 lattice.
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