Physics – Condensed Matter – Materials Science
Scientific paper
2011-10-18
Phys. Rev. B 85, 064405 (2012)
Physics
Condensed Matter
Materials Science
Scientific paper
10.1103/PhysRevB.85.064405
The phonon density of states (DOS) and magnetic excitation spectrum of polycrystalline BiFeO$_3$ were measured for temperatures $200 \leq T \leq 750\,$K, using inelastic neutron scattering (INS). Our results indicate that the magnetic spectrum of BiFeO$_3$ closely resembles that of similar Fe perovskites, such as LaFeO$_3$, despite the cycloid modulation in BiFeO$_3$. We do not find any evidence for a spin gap. A strong $T$-dependence of the phonon DOS was found, with a marked broadening of the whole spectrum, providing evidence of strong anharmonicity. This anharmonicity is corroborated by large-amplitude motions of Bi and O ions observed with neutron diffraction. These results highlight the importance of spin-phonon coupling in this material.
Brown Craig
Delaire Olivier
Gout Delphine
Huq Ashfia
Ma Jie
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