ISIS Neutron and Muon Source Data Journal

Universal Quantum-Critical Dynamics of a Two 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 quasi 2-dimensional spin network of PHCC allows, for the first time, the study of SO(3) symmetry breaking in two spatial dimensions. This transition is of particular interest due to the presence of a longitudinal Higgs excitation. Previous INS experiments deep in the ordered phase have allowed us to identify the ordering wave vector. Here, we propose to study the universal scaling of the dynamic structure factor around the ordering vector at the QCP in order to test specific predictions of the so-called non-linear sigma model.

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

DOI: 10.5286/ISIS.E.RB1510363

ISIS Experiment Number: RB1510363

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; (2015): Universal Quantum-Critical Dynamics of a Two Dimensional Antiferromagnet, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1510363

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