Analysis of the Knight shift data on Li and Zn substituted YBCO

Abstract

The Knight shift data on Li and Zn substituted YBa${}_2$Cu${}_3$O${}_{6+x}$ are analysed using an itinerant model with short-range antiferromagnetic correlations. The model parameters, which are determined by fitting the experimental data on the transverse nuclear relaxation rate $T_2^{-1}$ of pure YBa${}_2$Cu${}_3$O${}_{6+x}$, are used to calculate the Knight shifts for various nuclei around a nonmagnetic impurity located in the CuO${}_2$ planes. The calculations are carried out for Li and Zn impurities substituted into optimally doped and underdoped YBa${}_2$Cu${}_3$O${}_{6+x}$. The results are compared with the ${}^7$Li and ${}^{89}$Y Knight shift measurements on these materials.

24 pages, 15 figures, to appear in Physica C

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