The doping dependence of T* - what is the real high-Tc phase diagram?

Details The doping dependence of T* - what is the real high-Tc phase diagram? The doping dependence of T* - what is the real high-Tc phase diagram?

2000-05-03

arxiv.org/abs/cond-mat/0005063v2

Physics

Condensed Matter

13 pages, 11 figures, a response to confusion at M^2S Conference, Houston, regarding the phase behaviour of the HTS cuprates.

Scientific paper

10.1016/S0921-4534(00)01524-0

Underdoped high-Tc superconductors are frequently characterised by a temperature, T*, below which the normal-state pseudogap opens. Two different "phase diagrams" based on the doping (p) dependence of T* are currently considered: one where T* falls to zero at a critical doping state and the other where T* merges with Tc in the overdoped region. By examining the temperature dependence of the NMR Knight shift and relaxation rate, entropy, resistivity, infrared conductivity, Raman scattering, ARPES and tunnelling data it is concluded that the second scenario is not at all supported. Neither can one distinguish a small and a large pseudogap as is often done. T* is an energy scale which falls abruptly to zero at p=0.19.

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