Coexistence of the antiferromagnetic and superconducting order and its effect on spin dynamics in electron-doped high-$T_c$ cuprates

Abstract

In the framework of the slave-boson approach to the $t-t^{\prime }-t^{\prime \prime }-J$ model, it is found that for electron-doped high-$T_c$ cuprates, the staggered antiferromagnetic (AF) order coexists with superconducting (SC) order in a wide doping level ranged from underdoped to nearly optimal doping at the mean-field level. In the coexisting phase, it is revealed that the spin response is commensurate in a substantial frequency range below a crossover frequency ${\omega }_c$ for all dopings considered, and it switches to the incommensurate structure when the frequency is higher than ${\omega }_c$. This result is in agreement with the experimental measurements. Comparison of the spin response between the coexisting phase and the pure SC phase with a $d_{x^2-y^2}$-wave pairing plus a higher harmonics term (DP+HH) suggests that the inclusion of the two-band effect is important to consistently account for both the dispersion of the spin response and the non-monotonic gap behavior in the electron-doped cuprates.

6 pages, 5 figures

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Cited by in corpus (1)

• Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase