Central peak in the pseudogap of high T_c superconductors

Details Central peak in the pseudogap of high T_c superconductors Central peak in the pseudogap of high T_c superconductors

2004-07-30

arxiv.org/abs/cond-mat/0407800v3

Eur. Phys. J. B 46, 269-279 (2005)

Physics

Condensed Matter

Superconductivity

Final version as accepted in EPJ B, 13 pages, 8 figures

Scientific paper

10.1140/epjb/e2005-00244-x

We study the effect of antiferromagnetic (AF) correlations in the three-band Emery model, with respect to the experimental situation in weakly underdoped and optimally doped BSCCO. In the vicinity of the vH singularity of the conduction band there appears a central peak in the middle of a pseudogap, which is in an antiadiabatic regime, insensitive to the time scale of the mechanism responsible for the pseudogap. We find a quantum low-temperature regime corresponding to experiment, in which the pseudogap is created by zero-point motion of the magnons, as opposed to the usual semiclassical derivation, where it is due to a divergence of the magnon occupation number. Detailed analysis of the spectral functions along the (pi,0)-(pi,pi) line show significant agreement with experiment, both qualitative and, in the principal scales, quantitative. The observed slight approaching-then-receding of both the wide and narrow peaks with respect to the Fermi energy is also reproduced. We conclude that optimally doped BSCCO has a well-developed pseudogap of the order of 1000 K. This is only masked by the narrow antiadiabatic peak, which provides a small energy scale, unrelated to the AF scale, and primarily controlled by the position of the chemical potential.

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