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- W1989820512 abstract "Magnetic susceptibilities of interacting (d) electrons in the Hubbard model and the three-band ${mathrm{CuO}}_{2}$ model are worked out within the Gaussian fluctuations of the functional integral in the slave boson representation. The normalized Landau Fermi-liquid parameter |${mathit{F}}_{0}^{mathit{a}}$|/ensuremath{alpha} (ensuremath{alpha}ensuremath{equiv}${mathit{W}}_{0}$${mathit{N}}_{mathit{F}}^{0}$, ${mathit{N}}_{mathit{F}}^{0}$ the density of states at the Fermi level, and ${mathit{W}}_{0}$ the bare bandwidth) defined from the susceptibility expression is investigated for the two models as functions of Coulomb repulsion U, charge-transfer energy ensuremath{Delta}, and doping concentration ensuremath{delta}. It is shown that the Landau parameter for the three-band model is larger and exhibits different renormalization behaviors than that for the Hubbard model in both the weak- and strong-coupling regimes except in the Mott-Hubbard weak-coupling regime, where it takes the same random-phase approximation form U/${mathit{W}}_{0}$ as the latter. The reasons for these results are analyzed. The slave-boson Landau parameter for the Hubbard model exactly reproduces the T-matrix expression |${mathit{F}}_{0}^{mathit{a}}$|/ensuremath{alpha}=U/${mathit{W}}_{0}$/(1+U/${mathit{W}}_{0}$) in the low-density limit, whose renormalization has the different origin from that in the dilutely doped regime. textcopyright{} 1996 The American Physical Society." @default.
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- W1989820512 date "1996-07-01" @default.
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- W1989820512 title "Magnetic susceptibility and the Landau Fermi-liquid parameter of the Hubbard model and the three-bandCuO2model" @default.
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- W1989820512 doi "https://doi.org/10.1103/physrevb.54.1342" @default.
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