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Electronic Phase Diagram of High- T c Cuprate Superconductors from a Mapping of the In-Plane Resistivity Curvature

2004; American Physical Society; Volume: 93; Issue: 26 Linguagem: Inglês

10.1103/physrevlett.93.267001

1092-0145

Yoichi Ando, Seiki Komiya, Kouji Segawa, Shimpei Ono, Y. Kurita,

Magnetic properties of thin films

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.