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Impurity spin states in the paramagnetic phase of ferromagnets
Author(s) -
Timmesfeld K. H.
Publication year - 1972
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.2220490119
Subject(s) - condensed matter physics , spins , ferromagnetism , impurity , spin (aerodynamics) , paramagnetism , exchange interaction , phase (matter) , physics , quantum mechanics , thermodynamics
Abstract A theory has been developed for impurity spins in a Heisenberg ferromagnet in the temperature range above T c for which numerical calculations have been performed using as a simple model a simple cubic crystal with nearest‐neighbour exchange constant and a defect spin with different spin and nearest‐neighbour exchange values. The calculations show that there exist in certain cases resonances and localized spin states for the impurity spin the intensity of which goes to zero with increasing temperature. Since no coupling between the normal modes of the spin system has been included, the width of those states is nearly unchanged with temperature.