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TT: Tiefe Temperaturen

TT 14: Postersitzung II: Korrelierte Systeme(1-40), Theorie der Supraleitung(41-50), Metall-Isolator-Übergang, Lokalisierung(51-66), Niederdimensionale Systeme, Quantenhalleffekt(67-80), Pinning, kritische Ströme und Vortexdynamik(81-93), HTSL-Drähte und -Bänder(94-98), Massive HTSL(99-104), supraleitende Borkarbide(105-109)

TT 14.39: Poster

Mittwoch, 19. März 1997, 15:00–18:30, Z1

Spin-phonon interactions in magnets and the occurence of non-reciprocal effects — •R. Valenti, C. Gros, and V.N. Muthukumar — Institut f"ur Physik, Universität Dortmund, 44221 Dortmund

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We discuss the spin-phonon interactions in ordered ferromagnets and antiferromagnets. We study in particular the possible occurrence of non-reciprocal (non time-invariant) elastic effects due to the magnetoelastic couplings. We rederive Kittel’s [1] semiclassical prediction of non-reciprocal phonons in ferromagnets by calculating the mixed magnon-phonon states in the Liouville representation. We then examine in detail the conditions for non-reciprocal phonons to occur in antiferromagnets.

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[1] C. Kittel, Phys. Rev. 110, 836 (1958).