NMR properties of a one-dimesional Cu-O model

摘要

We obtain the Knight shifts and the relaxation rates related to the Fermicontact interaction term for a one-dimensional Cu-O model using bosonizationtechnique. We consider the small interaction limit at half-filling and awayfrom half-filling. In this framework we predict that the antiferromagneticcontribution to the relaxation rate of the nuclear oxygen spin is completelysuppressed even away from half-filling, when the temperature is low enough. Inthe strong interaction limit at half-filling we compute the effective Fermicontact interaction performing a Gutzwiller projection. Both limits suggestthat the one-dimensional versions of the Mila-Rice and of the Shastry scenariosof transferred hyperfine couplings which were proposed to explain the NMRmeasurements for High-T_c cuprates fail in a one-dimensional situation.