ISIS Neutron and Muon Source Data Journal

Quantum-Critical Dynamics of a 3-dimensional Antiferromagnet

Abstract: We have recently discovered a pressure-induced quantum phase transition (QPT) at 4.3 kbar in the gapped quantum magnet piperazinium hexachlorodicuprate (PHCC) by means of muon-spin rotation and inelastic neutron scattering (INS) measurements. The Heisenberg nature of the spins and the 3-dimensional spin network of PHCC allows, for the first time, the study of SO(3) symmetry breaking right at the upper critical dimension. This transition is of particular interest due to the presence of a Higgs (amplitude) mode. Previous INS experiments deep in the ordered phase have allowed us to identify the ordering wave vector. Here, we propose to measure the temperature dependence of the dynamic structure factor around the ordering vector at the QCP to study the universal scaling behavior and to reveal the special role of the upper critical dimension.

Principal Investigator: Professor Andrey Zheludev
Experimenter: Mr Gerard Perren
Local Contact: Dr Rob Bewley
Experimenter: Dr Johannes Moeller

DOI: 10.5286/ISIS.E.RB1610256

ISIS Experiment Number: RB1610256

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 Andrey Zheludev et al; (2016): Quantum-Critical Dynamics of a 3-dimensional Antiferromagnet, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1610256

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