Volume 98, Number 6, June 2012
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||25 June 2012|
Spin-spectral-weight distribution and energy range of the parent compound La2CuO4
Departamento de Física, Universidade de Évora - P-7000-671, Évora, Portugal, EU
2 CFIF, Instituto Superior Técnico, Universidade Técnica de Lisboa - Av. Rovisco Pais, P-1049-001 Lisboa, Portugal, EU
3 GCEP-Center of Physics, University of Minho - Campus Gualtar, P-4710-057 Braga, Portugal, EU
4 Institut für Theoretische Physik III, Universität Stuttgart - D-70550 Stuttgart, Germany, EU
5 Department of Physics and Astronomy, University of California - Irvine, CA 92617, USA
Accepted: 24 May 2012
The spectral-weight distribution in recent neutron scattering experiments on the parent compound La2CuO4 (LCO), which are limited in energy range to about 450 meV, is studied in the framework of the Hubbard model on the square lattice. We find that the higher-energy weight extends to about 566 meV and is located at and near the momentum [π, π]. Our results confirm that the U/t value suitable to LCO is in the range U/t∊(6, 8). The continuum weight energy-integrated intensity vanishes or is extremely small at momentum [π, 0]. This behavior of the intensity is consistent with that of spin waves, which are damped at [π, 0].
PACS: 78.70.Nx – Neutron inelastic scattering / 74.72.Cj – Insulating parent compounds / 71.10.Fd – Lattice fermion models (Hubbard model, etc.)
© EPLA, 2012
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