Department of Physics Papers

Document Type

Journal Article

Date of this Version

5-1-1971

Publication Source

Physical Review B

Volume

3

Issue

9

Start Page

3065

Last Page

3071

DOI

10.1103/PhysRevB.3.3065

Abstract

The longitudinal dynamical susceptibility of the Heisenberg ferromagnet is studied at short wavelengths and low temperatures. It is shown that identical results to order 1/S are obtained using (a) a spin decoupling technique, (b) a diagrammatic method using the Holstein-Primakoff transformation, and (c) a diagrammatic method using the Dyson-Maleev transformation. We thus conclude that there are no significant kinematic effects at low temperatures. Using the random-phase approximation, we find that the Dyson-Maleev interactions between magnons are too weak to support the existence of a zero-sound mode. Both these conclusions disagree with the recent results of other authors.

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Date Posted: 12 August 2015

This document has been peer reviewed.