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Many‐body effects in antiferromagnetic 4f‐systems
Author(s) -
Bulk G.,
Nolting W.
Publication year - 1987
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.2221400127
Subject(s) - quasiparticle , antiferromagnetism , condensed matter physics , excitation , coupling constant , semiconductor , polarization (electrochemistry) , electronic structure , physics , density of states , materials science , chemistry , superconductivity , quantum mechanics
A many body approach is presented for the electronic excitation spectrum of an antiferromagnetic semiconductor with ABAB‐sublattice structure. By use of the s–f model the sensitive dependencies of the quasiparticle density of states (Q‐DOS) on the temperature T , the carrier concentration n , and the effective coupling constant g/W is derived and discussed. The electronic spin polarization per sublattice is a direct consequence of this Q‐DOS‐behaviour. It increases for higher band occupations, lower temperatures and stronger couplings g/W . The lower edge of the quasi‐particle spectrum shifts with increasing n to higher energies showing for fixed n rather small blue shifts as function of decreasing temperature.