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Publications (1)

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    Takeshi Nishimatsu · Umesh V. Waghmare · Yoshiyuki Kawazoe · [...] · Yoshihiko Saito
    [Show abstract] [Hide abstract] ABSTRACT: We report a simple safe and attractive pedagogic demonstration with magnetic compasses that facilitates an intuitive understanding of the concept that ferromagnetism and ferroelectricity do not result from dipole-dipole interactions alone. Phonon dispersion relations were calculated for a 3-dimensional simple-cubic dipole crystal and a 2-dimensional square-lattice dipole crystal. The latter calculation corresponds to the compass demonstration that confirm the antiferro ground state structure. A sum rule for the three optical phonon frequencies is discussed. A mathematical non-analyticity in the longitudinal optical phonon are also illustrated.
    Full-text available · Article · Jan 2006