Quasiparticle broadening in insulating copper oxides.

Fleck M., Vandenbrink J., Lichtenstein A. I., Olés A. M., Hedin L.

Max Planck Inst Festkorperforsch Heisenbergstr 1 D-70569 Stuttgart Germany
Kfa Julich Gmbh Forschungszentrum D-52425 Julich Germany
Jagiellonian Univ Inst Phys Krakow Poland

We calculate the spectral function of the half-filled two-dimensional Hubbard model with realistic hopping integrals for Sr2CuO2Cl2 within the dynamical mean-field theory at finite temperatures. It is shown that precursor effects of incommensurate spin dynamics lead to an incoherent broadening of the quasiparticle peaks on an energy scale that depends on local spin order. This might serve as an indirect method of detecting changes of local spin order under doping.
© Copyright 1999 Elsevier Science B.V. All rights reserved.

Physica B, 261 729-731, 1999.

Max-Planck Institut für Festkörperforschung;
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