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Journal articles
Magnetoelastic and magnetoelectric couplings across the antiferromagnetic transition in multiferroic BiFeO 3
Abstract : Clear anomalies in the lattice thermal expansion (deviation from linear variation) and elastic properties (soft-ening of the sound velocity) at the antiferromagnetic-to-paramagnetic transition are observed in the prototypical multiferroic BiFeO 3 using a combination of picosecond acoustic pump-probe and high-temperature x-ray-diffraction experiments. Similar anomalies are also evidenced using second-principles calculations supporting our experimental findings. Those calculations, in addition to a simple Landau-like model we also developed, allow us to understand the elastic softening and lattice change at T N as a result of magnetostriction combined with electrostrictive and magnetoelectric couplings, which renormalize the elastic constants of the high-temperature reference phase when the critical T N temperature is reached.
Cited literature [55 references]
https://hal-centralesupelec.archives-ouvertes.fr/hal-02108984
Contributor : Christine Vinée-Jacquin <>
Submitted on : Monday, September 21, 2020 - 2:29:32 PM
Last modification on : Tuesday, July 20, 2021 - 3:06:14 AM
Long-term archiving on: : Thursday, December 3, 2020 - 3:03:22 PM
Contributor : Christine Vinée-Jacquin <>
Submitted on : Monday, September 21, 2020 - 2:29:32 PM
Last modification on : Tuesday, July 20, 2021 - 3:06:14 AM
Long-term archiving on: : Thursday, December 3, 2020 - 3:03:22 PM
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spinphononBFO_v6.pdf
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