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Communication Dans Un Congrès Année : 2019

Temperature Evolution of Atomic Dynamics in Chemically Ordered Lead Scandium Niobate Studied by Inelastic Neutron Scattering

Résumé

Preliminary results of inelastic neutron scattering in chemically ordered Pb(Sc 1/2 Nb 1 / 2 )O 3 (PSN) are reported. It is shown that neutron spectra, obtained around 220 node in [11¯0] direction, are characterised by intense central peak and broad phonon resonances at all studied temperatures. It has been found that TO in-plane polarised phonons do not demonstrate any softening. On the contrary, clear growth of TO phonon energy was detected for all temperatures. Intensity of the central peak continuously grows on cooling. Observed critical dynamics scenario completely differs from the expected one for relaxor or ferroelectric material. We believe our observations could bring new insights in the understanding of the microscopic origin of the relaxor phenomena.
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Dates et versions

hal-04468526 , version 1 (20-02-2024)

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Daria Andronikova, P.-E. Janolin, Alexei Filimonov, Alexandre Ivanov, Sergey Vakhrushev. Temperature Evolution of Atomic Dynamics in Chemically Ordered Lead Scandium Niobate Studied by Inelastic Neutron Scattering. 2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech), Oct 2019, St. Petersburg, Russia. pp.230-232, ⟨10.1109/EExPolytech.2019.8906808⟩. ⟨hal-04468526⟩
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