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Elementary Excitation Spectrum of the Heisenberg Ferromagnet,
NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF CHEMISTRY
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The method of thermodynamic two-time retarded Green function is applied to calculate the elementary excitation spectrum of a simple cubic Heisenberg ferromagnet. An expression for the spin-wave self-energy operator is obtained in terms of the three-particle Green function. Modified author abstract
APPROVED FOR PUBLIC RELEASE