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Influence of a Magnetic Field on the Susceptibility of a Heisenberg Ferromagnet near the Critical Point
Author(s) -
Fechner B. J.
Publication year - 1976
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.2220750232
Subject(s) - condensed matter physics , curie temperature , paramagnetism , ferromagnetism , physics , curie constant , magnetic susceptibility , absolute zero , coupling constant , magnetic moment , magnetic field , curie–weiss law , quantum mechanics
Starting from the high temperature series expansion of the free energy, a magnetic equation of state is derived for the paramagnetic region valid for any crystal lattice and any spin value and solvable in various approximations. The equation is used in the Gaussian approximation to study the temperature and field dependence of the magnetic susceptibility near and above the Curie point. The results are compared with the experimental data for nickel. It is deduced that at the Curie temperature and in zero external field, the exchange coupling constant J = 132.6 k ‐ and the average atomic moment n 0 = 0.65′ B .