ISIS Neutron and Muon Source Data Journal

Avalanche-like hybrid-improper ferroelectric transition in SrBi2Nb2O9

Abstract: Improper-ferroelectrics (FE) are the backbone to development towards room-temperature multiferroics and carry the immense technological potential for next-generation data-storage and energy conversion. This class of FEs differs from displacive FEs (i.e. BaTiO3) as ferroelectricity is induced by anharmonic coupling between a (multiple) non-polar and a polar mode. With the proposed work, we aim to measure the condensation of non-polar and polar modes and confirm the theoretically proposed transition path. These polar and non-polar modes involve motions of heavy (Bi) and light (O) atoms, consequently, their energy scales are vastly different allowing for separation of dynamics on powder samples. Detailed T-dependent phonon measurements will also enable us to probe unusual T-dependence of polarization, which deviates strongly from square-root law because of the anharmonic coupling.

Principal Investigator: Professor Dipanshu Bansal
Experimenter: Mr ANSHUL JAIN
Experimenter: Mr Aditya Prasad Roy
Experimenter: Mr Arush Gupta
Local Contact: Dr Duc Le

DOI: 10.5286/ISIS.E.RB1968028

ISIS Experiment Number: RB1968028

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
Select the data format above to find out more about it.

Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Professor Dipanshu Bansal et al; (2019): Avalanche-like hybrid-improper ferroelectric transition in SrBi2Nb2O9, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1968028

Data is released under the CC-BY-4.0 license.