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Effect of Lattice Dimerization on a System with Coexisting Charge and Spin Density Waves
Author(s) -
Caprara S.
Publication year - 1999
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/(sici)1521-3951(199912)216:2<1089::aid-pssb1089>3.0.co;2-1
Subject(s) - antiferromagnetism , condensed matter physics , metastability , lattice (music) , charge density wave , ground state , adiabatic process , spin density wave , chemistry , physics , atomic physics , quantum mechanics , superconductivity , acoustics
An extended Hubbard‐Holstein model is used to investigate the conditions for the existence and the stability of spin density wave antiferromagnetic order in a system with a chemically induced charge density wave, in the presence of a lattice dimerization, produced by the coupling of the electron density to the lattice, in the adiabatic limit. In the weak coupling limit the antiferromagnetic ground state is slightly affected and can support a lattice dimerization. As the coupling to the lattice is increased a metastable situation is reached in which the dimerized antiferromagnetic phase competes with a paramagnetic phase with a larger lattice dimerization. A first‐order phase transition is found in the metastable region. The dimerized antiferromagnetic phase disappears abruptly at a critical value of the electron–lattice coupling.