ISIS Neutron and Muon Source Data Journal

Field-driven closure of the Haldane gap in an ideal coordination polymer spin-chain

Abstract: Chains comprising integer spin magnetic moments exhibit the celebrated non-magnetic Haldane phase, which is very different relative to the half-integer spin equivalent. We have recently discovered and characterised a molecule-based magnet system which is an ideal example of a Haldane chain, NiI2(3,5-lut)4. Crucially, deviations from the idealised spin-one chain are exceedingly small in this compound. Zero-field Inelastic neutron scattering at ISIS was successfully used to study the magnetic excitations in this system at zero-field, including the presence of the famous Haldane gap, and these data form part of an upcoming publication. We now propose to extend this study to non-zero magnetic fields, in order to investigate the field-driven evolution of the excitation spectrum up to and beyond the field-induced quantum phase transition where the Haldane gap is closed.

Principal Investigator: Dr Robert Williams
Local Contact: Dr David Voneshen
Experimenter: Mr Sam Curley
Experimenter: Dr Paul Goddard
Experimenter: Professor Jamie Manson
Experimenter: Dr Matthew Coak
Local Contact: Dr Ross Stewart

DOI: 10.5286/ISIS.E.RB1920088

ISIS Experiment Number: RB1920088

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 Robert Williams et al; (2019): Field-driven closure of the Haldane gap in an ideal coordination polymer spin-chain, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1920088

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