ISIS Neutron and Muon Source Data Journal

Magnetic ground state of Ho3CrGa4O12: A promising low temperature magnetocaloric material

Abstract: Solid state magnetic refrigeration is a viable alternative to cooling using increasingly scarce liquid helium. A good magnetocaloric material in this temperature regime would have: a) suppressed or no magnetic ordering b) high change in magnetic entropy c) optimum performance in low fields attained by a permanent magnet, eliminating the need for cryogens. The frustrated Ising garnet, Ho3Ga5O12, satisfies these criteria. We find partial Cr3+ substitution in Ho3Ga5O12 leads to a dramatic increase in magnetocaloric performance. We propose this is due to changes in the magnetic ground state in Ho3CrGa4O12. Neutron data above 2 K shows no ordering features; the susceptibility shows a broad feature at 0.7 K. We aim to carry out neutron scattering measurements down to 0.05 K to determine the magnetic ground state and model the key magnetic interactions and magnetocaloric effect in Ho3CrGa4O12.

Principal Investigator: Professor Sian Dutton
Principal Investigator: Dr Fabrizia Foglia
Experimenter: Miss Paromita Mukherjee
Local Contact: Dr Victoria Garcia Sakai

DOI: 10.5286/ISIS.E.RB1800001

ISIS Experiment Number: RB1800001

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:
Professor Sian Dutton et al; (2018): Magnetic ground state of Ho3CrGa4O12: A promising low temperature magnetocaloric material, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1800001

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