Abstract
In the framework of the slave-boson approach to thet–t′–t′′–J model, it is found that for electron-doped high-Tc cuprates, the staggered antiferromagnetic (AF) order coexists with the superconducting(SC) order in a wide doping level ranged from underdoped to nearly optimally doped at themean-field level. In the coexisting phase, it is revealed that the spin responseis commensurate in a substantial frequency range below a crossover frequencyωc forall dopings considered, and it switches to the incommensurate structure when the frequency is higherthan ωc. This result is in agreement with the experimental measurements. Comparison ofthe spin response between the coexisting phase and the pure SC phase with adx2−y2-wave pairing plus a higher harmonics term (DP+HH) suggests that the inclusion of the two-band effect is important to consistently account forboth the dispersion of the spin response and the non-monotonic gap behavior in theelectron-doped cuprates.
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