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Theory of Coupled Nuclear and Electronic Spin‐Wave Modes I. The Linear Approximation
Author(s) -
Tucker J. W.
Publication year - 1973
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.2220600228
Subject(s) - hyperfine structure , physics , diagrammatic reasoning , perturbation theory (quantum mechanics) , quantum mechanics , spin (aerodynamics) , electronic structure , quantum electrodynamics , condensed matter physics , philosophy , linguistics , thermodynamics
A quantum field theoretical perturbation method is employed in a study of the coupled nuclear and electronic spin‐wave modes that exist in magnetically ordered materials due to the hyperfine interaction. The calculation makes use of a diagrammatic technique in which the evaluation of the thermal averages of products of spin operators is facilitated by the use of the drone‐fermion representation. The dispersion relation for the undamped coupled nuclear and electronic spin‐wave modes is derived in linear theory and the contribution to the free energy from the spin‐flip part of the hyperfine interaction is found.