Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-03-02
Phys. Rev. B 72, 054504 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 eps figures, minor improvement, references added, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.72.054504
Within the Kotliar-Ruckenstein slave-boson approach, we have studied the antiferromagnetic (AF) properties for the $t$-$t'$-$t''$-$U$ model applied to electron-doped cuprate superconductors. Due to inclusion of spin fluctuations the AF order decreases with doping much faster than obtained in the Hartree-Fock theory. Under an intermediate {\it constant} $U$ the calculated doping evolution of the spectral intensity has satisfactorily reproduced the experimental results, without need of a strongly doping-dependent $U$ as argued earlier. This may reconcile a discrepancy suggested in recent studies on photoemission and optical conductivity.
Ting Samuel C. C.
Yuan Fang-Fang
Yuan Qingshan
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