Physics – Condensed Matter – Superconductivity
Scientific paper
2004-11-04
Phys. Rev. B 71, 134522 (2005)
Physics
Condensed Matter
Superconductivity
5 pages, 3 figures, published version with minor changes
Scientific paper
10.1103/PhysRevB.71.134522
Based on the $t$-$t'$-$t''$-$J$ model we have calculated the dynamical spin susceptibilities in the antiferromagnetic (AF) phase for electron-doped cuprates, by use of the slave-boson mean-field theory and random phase approximation. Various results for the susceptibilities versus energy and momentum have been shown at different dopings. At low energy, except the collective spin-wave mode around $(\pi,\pi)$ and 0, we have primarily observed that new resonance peaks will appear around $(0.3\pi,0.7\pi)$ and equivalent points with increasing doping, which are due to the particle-hole excitations between the two AF bands. The peaks are pronounced in the transverse susceptibility but not in the longitudinal one. These features are predicted for neutron scattering measurements.
Lee Timothy K.
Ting Samuel C. C.
Yuan Qingshan
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