Theoretical Studies of Underdoped Cuprates

该更新奖支持理论研究，以发展使用自旋涨落方法的铜酸盐超导和正常态性质的理论。 这种方法是基于费米子通过自旋涨落相互作用，几乎是反铁磁的，并减少到一个模型与三个自由参数。 目前的目标是在这个模型中计算超导转变温度，Tc，作为掺杂的函数，费米子谱函数的形式，以及低于Tc的动态自旋磁化率。 本研究的最终目标是发展基于自旋涨落模型的铜氧化物的完整理论。高Tc超导材料在掺杂和转变成金属超导体之前是绝缘的反铁磁体。 该研究奖将支持首席研究员继续开展工作，以基于自旋波动方法开发铜酸盐的超导和正常态性质的理论，在此努力下开发的特定模型试图用三个独立参数描述铜酸盐的重要材料性质。 这项研究对于理解铜酸盐的神秘性质至关重要，包括掺杂后高温超导性的出现。

This renewal award supports theoretical research in developing a theory for superconducting and normal state properties of cuprates using a spin-fluctuation approach. This approach is based on fermions interacting via spin fluctuations that are nearly antiferromagnetic, and reduced to a model with three free parameters. The current goal is to calculate within this model the superconducting transition temperature, Tc, as a function of doping, the forms of the fermionic spectram function, and the dynamical spin susceptibility below Tc. The ultimate goal of this research is to develop the full theory of cuprates based on the spin-fluctuation model.%%%The high Tc superconducting materials start as insulating antiferromagnets before they are doped and transformed into metallic superconductors. This research award will support continued work by the principal investigator to develop a theory for superconducting and normal state properties of the cuprates based on a spin-fluctuation approach, with the particular model developed under this effort attempting to describe the important materials properties of the cuprates with only three independent parameters. This research is of critical importance in understanding the mysterious properties of the cuprates, including the appearance of high-temperature superconductivity upon doping.***