A Universal Intrinsic Scale of Hole Concentration for High-Tc Cuprates

Abstract

We have measured thermoelectric power (TEP) as a function of hole concentration per CuO2 layer, Ppl, in Y1-xCaxBa2Cu3O6 (Ppl = x/2) with no oxygen in the Cu-O chain layer. The room-temperature TEP as a function of Ppl, S290(Ppl), of Y1-xCaxBa2Cu3O6 behaves identically to that of La2-zSrzCuO4 (Ppl = z). We argue that S290(Ppl) represents a measure of the intrinsic equilibrium electronic states of doped holes and, therefore, can be used as a common scale for the carrier concentrations of layered cuprates. We shows that the Ppl determined by this new universal scale is consistent with both hole concentration microscopically determined by NQR and the hole concentration macroscopically determined by the Cu valency. We find two characteristic scaling temperatures, TS* and TS2*, in the TEP vs. temperature curves that change systematically with doping. Based on the universal scale, we uncover a universal phase diagram in which almost all the experimentally determined pseudogap temperatures as a function of Ppl fall on two common curves; upper pseudogap temperature defined by the TS* versus Ppl curve and lower pseudogap temperature defined by the TS2* versus Ppl curve. We find that while pseudogaps are intrinsic properties of doped holes of a single CuO2 layer for all high-Tc cuprates, Tc depends on the number of layers, therefore the inter-layer coupling, in each individual system.

11 pages, 9 figures, accepted for publication in Physical Review B

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• Intrinsic electronic superconducting phases at 60 K and 90 K in double-layer YBa${}_2$Cu${}_3$O${}_{6+\delta }$
• Evidence of two distinct charge carriers in underdoped high Tc cuprates
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• Universal scaling of c-axis dc conductivity for the underdoped hightemperature cuprate superconductors
• Observation of the predicted charge collective mode of the Tc = 45 K superconducting phase of La2CuO4+δ
• The "Bohr" Model for the High Tc Superconductivity
• Fractional statistics of charge carriers in the one- and two-dimensional t-J model. A hint for the cuprates?
• Energy-Dependent Enhancement of the Electron-Coupling Spectrum of the Underdoped Bi2Sr2CaCu2O8+d Superconductor
• Far-infrared measurements of oxygen-doped polycrystalline La2CuO4.0315 superconductor under slow-cooled and fast-cooled conditions
• Universal intrinsic doping behavior of in-plane dc conductivity for hole-doped high-temperature cuprate superconductors
• Singling out the effect of quenched disorder in the phase diagram of cuprates
• Growth and hole density control through equilibrium oxygen annealing of optimally doped Y1-xCaxBa2Cu3O7-δ single crystals
• On the quantitative determination of hole-concentration in high-temperature cuprate superconductors
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• Doping-induced evolution of the intrinsic hump and dip energies dependent on the sample fabrication conditions in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$