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APS » Journals » Phys. Rev. B » Volume 79 » Issue 18
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Phys. Rev. B 79, 180411(R) (2009) [4 pages]

Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals

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P. Rovillain, M. Cazayous, Y. Gallais, and A. Sacuto
Laboratoire Matériaux et Phénomènes Quantiques, UMR 7162 CNRS, Université Paris Diderot-Paris 7, 75205 Paris Cedex 13, France

R. P. S. M. Lobo
Laboratoire Photons et Matiére, CNRS UPR 5, ESPCI, Université Pierre et Marie Curie, 10 rue Vauquelin, 75231 Paris Cedex 5, France

D. Lebeugle and D. Colson
Service de Physique de l’Etat Condensé, DSM/DRECAM/SPEC, CEA Saclay, 91191 Gif-sur-Yvette, France

Received 20 January 2009; revised 30 April 2009; published 27 May 2009

Raman scattering measurements on BiFeO3 single crystals show an important coupling between the magnetic order and lattice vibrations. The temperature evolution of phonons shows that the lowest energy E and A1 phonon modes are coupled to the spin order up to the Néel temperature. Furthermore, low temperature anomalies associated with the spin reorientation are observed simultaneously in both the E phonon and the magnon. These results suggest that magnetostriction plays an important role in BiFeO3.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.180411
DOI:
10.1103/PhysRevB.79.180411
PACS:
75.25.+z, 77.80.Bh, 75.50.Ee, 78.30.Hv
 
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