Understanding High Temperature Superconductors: Progress and Prospects

Details Understanding High Temperature Superconductors: Progress and Prospects Understanding High Temperature Superconductors: Progress and Prospects

1997-04-11

arxiv.org/abs/cond-mat/9704102v1

Physics

Condensed Matter

6 pages, 1 figure. To appear in a special issue of Physica C of the M2S-HTSC-V Conference held Feb. 28-Mar. 4, 1997, in Beijin

Scientific paper

10.1016/S0921-4534(97)00253-0

I review progress in measurements of the dynamic spin susceptibility in the normal state which yield a new phase diagram and discuss microscopic calculations which yield qualitative, and in many cases, quantitative agreement with the measured changes in the quasiparticle, transport, magnetotransport, and optical properties of the cuprate superconductors as one varies doping and temperature provided one describes the systems as nearly anti-ferromagnetic Fermi liquids in which the effective magnetic interaction between planar quasiparticles mirrors the dynamic spin susceptibility measured in NMR and INS experiments. Together with the demonstration that the NAFL pairing potential leads inexorably to a d_x2-y2,pairing state, this work provides a "proof of concept" for the NAFL description of high Tc materials. I review Eliashberg calculations of the mean-field behavior found in overdoped systems and discuss the extent to which the crossovers to pseudoscaling and pseudogap behavior found in the effective magnetic interaction and quasiparticle behavior in the optimally doped and underdoped systems may be derived microscopically. I conclude with a tentative scenario for the dependence of Tc on doping level and imperfections in different systems.

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