Effect of the higher d-wave gap harmonics and possible s-wave component on spin dynamics in electron-doped high- superconductors

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

“…This feature agrees with the neutron scattering measurements on electron-doped cuprates that have been reported recently [23]. Whereas for DP + HH, the spin response is incommensurate at low frequency, then switches to be commensurate within the intermediate frequency range, and becomes incommensurate again at higher frequency [31]. These results can be summarized in the intensity plot of the imaginary part of the renormalized spin susceptibility Im χ(q, ω) as a function of frequency and momentum along the (π, q y ) direction, shown in figure 5.…”

“…This result is qualitatively consistent with experiments. 23,24,25,26,27,28 While in the framework of the pure SC state with d x 2 −y 2 -wave and/or DP+HH, 30,31,32 , though an extended region of a commensurate spin fluctuation also exists, it evolves into an incommensurate spin fluctuation at low frequencies, which is not consistent experiments. Therefore, our result suggests that the inclusion of the two-band effect resulting from the coexisting AF and SC orders is important to consistently account for both the spin dynamics and the non-monotonic gap behavior in the electron-doped cuprates.…”