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Correlation Functions of Weakly Bonded Impurity Spin in a Ferromagnet at High Temperatures
Author(s) -
Los V. F.
Publication year - 1974
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.2220630237
Subject(s) - impurity , spins , condensed matter physics , ferromagnetism , physics , spin (aerodynamics) , atom (system on chip) , magnetic impurity , excitation , perturbation (astronomy) , quantum mechanics , thermodynamics , computer science , embedded system
Correlation functions have been calculated for the operator of a weakly bonded impurity spin in the Heisenberg ferromagnet in the temperature range whose lower limit is determined by the condition kT ≫ S|ω 0 | (S is the magnitude of impurity atom spin, ω 0 the excitation energy of a weakly bonded impurity spin) with the exception of a close neighbourhood around the point of the phase transition of second order. The calculation was performed by summation of the infinite series of the perturbation theory for correlation functions. No representation of the Holstein‐Primakoff type was used for the spin operators of the impurity atom and the spins of the matrix atoms.