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Lattice dynamics of EuO : evidence for giant spin-phonon coupling
author:
Pradip R., Piekarz P., Bosak A., Merkel D. G., Waller O., Seiler A., Chumakov A. I., Ruffer R., Oleś Andrzej , Parlinski K., Krisch M., Baumbach T., Stankov S.
Comprehensive studies of lattice dynamics in the ferromagnetic semiconductor EuO have been performed by a combination of inelastic x-ray scattering, nuclear inelastic scattering, and ab initio calculations. A remarkably large broadening of the transverse acoustic phonons was discovered at temperatures above and below the Curie temperature T_{C}=69 K. This result indicates a surprisingly strong momentum-dependent spin-phonon coupling induced by the spin dynamics in EuO.
affiliation:
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego