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

Abstract

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.

13 pages, 11 figures, a response to confusion at M^2S Conference, Houston, regarding the phase behaviour of the HTS cuprates. Submitted to Physica C, 2 May 2000. More references added as well as section on c-axis resistivity

References in corpus (1)

• Evidence for coexistence of the superconducting gap and the pseudo - gap in Bi-2212 from intrinsic tunneling spectroscopy

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