The dynamical spin susceptibility, χ( q , ω), of the extended t - J model, which reproduces Fermi surfaces of LSCO and YBCO type of high- T c cuprates, has been evaluated in the slave-boson mean field approximation based on the uniform (u-) and the d -wave singlet (s-) RVB states. The calculated results show reasonable agreement with neutron scattering data for the incommensurate structure in LSCO. For the commensurate structure in 90 K YBCO, the ω-dependence shows general agreement, but the location of the strongest peak at low temperatures does not. The temperature ( T ) dependences of the rates, T 1 -1 and T G -1 , and the shift of NMR are consistent with experimental data in the high-doping region, while they are not in the low-doping (but superconducting) region. We propose that the sharp drop in ( T 1 T ) -1 above T c in the low-doping region may be due to singlet formation.
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Tanamoto et al. (1994) studied this question.