ISIS Neutron and Muon Source Data Journal

Inelastic neutron scattering study of exchange disorder in CaFe2O4 and CaFe1.5Cr0.5O4

Abstract: We would like to investigate polycrystalline CaFe2O4 which undergoes two magnetic transitions to a B phase below 190 K and to a A phase below 160 K. Both phases coexist in a narrow temperature range. Preliminary inelastic neutron scattering results show broad magnetic fluctuations in the B phase which could not be reproduced by linear spin wave theory. A comparison with the substituted compound CaFe1.5Cr0.5O4, expected to host exchange disorder and which stabilises only the B phase, shows a similar magnetic spectrum indicating that disorder may dominate in CaFe2O4 in its high temperature phase. We would like to measure CaFe2O4 and CaFe1.5Cr0.5O4 in the B phase using a non-magnetic isostructural compound CaSc2O4 as background, in order to apply the first moment sum rule as an alternative to spin wave calculations in order to extract the exchange constants in the B phase.

Principal Investigator: Dr Manila Songvilay
Experimenter: Dr Harry Lane
Experimenter: Dr Elise Pachoud
Experimenter: Dr Sylvain Petit
Experimenter: Dr Francoise Damay
Experimenter: Dr Chris Stock
Local Contact: Dr Duc Le

DOI: 10.5286/ISIS.E.RB1820452

ISIS Experiment Number: RB1820452

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

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

For Example:
Dr Manila Songvilay et al; (2019): Inelastic neutron scattering study of exchange disorder in CaFe2O4 and CaFe1.5Cr0.5O4, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1820452

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