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Spin waves in La 2 CuO 4 : band structure and correlation effects
Author(s) -
Peres N. M. R.,
Araújo M. A. N.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301719
Subject(s) - condensed matter physics , antiferromagnetism , physics , random phase approximation , square lattice , spin wave , inelastic neutron scattering , electronic band structure , dispersion (optics) , ground state , coulomb , hubbard model , neutron scattering , spin (aerodynamics) , scattering , quantum mechanics , ising model , electron , superconductivity , ferromagnetism , thermodynamics
We calculate the antiferromagnetic spin wave dispersion in the half‐filled (electronic density n = 1) Hubbard model for a two‐dimensional square lattice, using the random phase approximation (RPA) in a broken symmetry (spin density wave) ground state. Our results for the spin wave dispersion, ω ( q ), are compared with high‐resolution inelastic neutron scattering performed on La 2 CuO 4 . The effects of different band structures and different values of the on‐site Coulomb interaction on the spin wave spectrum are studied. Particular attention is put on the high energy dispersion values ω ( π /2, π /2) and ω (0, π ).