Critical doping in overdoped high-Tc superconductors - a Quantum Critical Point?
arXiv:cond-mat/9911157 · doi:10.1002/(SICI)1521-3951(199909)215:1<531::AID-PSSB531>3.3.CO;2-N
Abstract
Evidence is presented from the scaling of the Knight shift, entropy and transport properties together with the sharp peaking of condensation energy, critical currents, superfluid density and a variety of other physical properties for the occurrence of a common critical doping point in lightly overdoped high-Tc superconductors (HTS). This critical doping lies at the point where the doping-dependent normal-state pseudogap energy, Eg, falls to zero and bears a strong, though incomplete, resemblance to a quantum critical point (QCP). A QCP scenario could lead directly to an explanation of the non-Fermi liquid behaviour of the normal-state metallic phase and the overall generic behaviour of the HTSC.
12 pages, 10 figures, presented at ICSSS-99, 7 September 1999