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Impact of the surface phase transition on magnon and phonon excitations in BiFeO3 nanoparticles

We have performed Raman scattering measurements on BiFeO3 nanoparticles and studied both magnetic and lattice modes. We reveal strong anomalies between 140 K and 200 K in the frequency of magnon and E(LO1), E(TO1) and A1(LO1) phonon modes. These anomalies are related to a surface expansion and are enhanced for nanoparticle sizes approaching the spin cycloidal length. These observations point out the strong interplay between the surface, the lattice, and the magnetism for sizes of BiFeO3 nanoparticles close to the cycloid periodicity.

preprint2020arXivOpen access
Ian AupiaisPierre HemmeMarc AllenAlexis ScidaXiao LuChristian RicolleauYann GallaisAlain SacutoStanislaus WongRogério de SousaMaximilien Cazayous
cond-mat.str-elcond-mat.mtrl-sci
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Open access11 authors2 topics
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Ian AupiaisPierre HemmeMarc AllenAlexis ScidaXiao LuChristian RicolleauYann GallaisAlain SacutoStanislaus WongRogério de SousaMaximilien Cazayous

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