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Quasiparticle Spectrum of an Antiferromagnetic Local Moment Metal
Author(s) -
Mathi Jaya S.,
Nolting W.
Publication year - 1998
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(199808)208:2<497::aid-pssb497>3.0.co;2-q
Subject(s) - quasiparticle , condensed matter physics , magnon , antiferromagnetism , physics , electronic band structure , electron , polaron , ferromagnetism , superconductivity , quantum mechanics
The s–f model is used to describe the temperature dependent electronic quasiparticle spectrum of a partially filled energy band which is exchange coupled to an antiferromagnetically ordered local moment system. The self‐energy of the band electrons is approximately calculated by the extension of a moment conserving decoupling procedure recently developed for the description of the ferromagnetic counterpart. Results are presented in terms of sublattice quasiparticle band structures, spectral densities, quasiparticle densities of states and characteristic interband (“mixed s–f”) correlations as functions of temperature T and band occupation n . The temperature dependence of the sublattice band structure is almost exclusively due to a redistribution of spectral weight between the various quasiparticle branches while their positions are rather unaffected. As for the ferromagnet, the quasiparticle splittings can be addressed to the formation of a magnetic polaron (propagating electron dressed by a virtual cloud of magnons) and to the appearance of scattering states (magnon emission and absorption).