Pseudogap Formation in the Symmetric Anderson Lattice Model

Details Pseudogap Formation in the Symmetric Anderson Lattice Model Pseudogap Formation in the Symmetric Anderson Lattice Model

1994-04-25

arxiv.org/abs/cond-mat/9404076v1

Physics

Condensed Matter

RevTeX - 14 pages and 7 figures (available on request), NRL-JA-6690-94-0024

Scientific paper

10.1103/PhysRevB.50.7304

We present self-consistent calculations for the self-energy and magnetic susceptibility of the 2D and 3D symmetric Anderson lattice Hamiltonian, in the fluctuation exchange approximation. At high temperatures, strong f-electron scattering leads to broad quasiparticle spectral functions, a reduced quasiparticle band gap, and a metallic density of states. As the temperature is lowered, the spectral functions narrow and a pseudogap forms at the characteristic temperature $T_x$ at which the width of the quasiparticle spectral function at the gap edge is comparable to the renormalized activation energy. For $T << T_x $, the pseudogap is approximately equal to the hybridization gap in the bare band structure. The opening of the pseudogap is clearly apparent in both the spin susceptibility and the compressibility.

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