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On the Magnetism in Narrow‐Band Conductors
Author(s) -
Karpenko B. V.
Publication year - 1981
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.2221040202
Subject(s) - paramagnetism , condensed matter physics , magnetism , curie temperature , exchange interaction , electron , magnetic moment , coulomb , chemistry , curie–weiss law , ferromagnetism , physics , quantum mechanics
Abstract The problem of the double exchange interaction mechanism in narrow‐band magnetic conducting crystals in terms of the Vonsovskii s‐f exchange model is considered taking into account the Coulomb interaction between conduction electrons, using Hubbard approximation. The values of the Néel paramagnetic temperature and of effective paramagnetic moment, as function of concentration of current carriers, are determined. A comparison of the theoretical expressions with the experimentally found Gd concentration dependence of the Curie paramagnetic temperature of solid solutions Eu 1– x Gd x Se helps to obtain a correlation between the conduction band width, the magnitude of the intraatomic exchange integral, and the value of the Coulomb interaction of electrons on a site. The variation of the effective magnetic moment value in the Eu 1– x La x S series, as a function of La concentration is discussed.