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Phys Rev Lett. 2004 Dec 31;93(26 Pt 1):267001. Epub 2004 Dec 20.

Electronic phase diagram of high-Tc cuprate superconductors from a mapping of the in-plane resistivity curvature.

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1
Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan. ando@criepi.denken.or.jp

Abstract

We propose that resistivity curvature mapping (RCM) based on the in-plane resistivity data is a useful way to objectively draw electronic phase diagrams of high-Tc cuprates, where various crossovers are important. In particular, the pseudogap crossover line can be conveniently determined by RCM. We show experimental phase diagrams obtained by RCM for Bi2Sr2-zLazCuO6+delta, La2-xSrxCuO4, and YBa2Cu3Oy, and demonstrate the universal nature of the pseudogap crossover. Intriguingly, the electronic crossover near optimum doping depicted by RCM appears to occur rather abruptly, suggesting that the quantum-critical regime, if it exists, must be very narrow.

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