ISIS Neutron and Muon Source Data Journal
This is a page describing data taken during an experiment at the ISIS Neutron and Muon Source. Information about the ISIS Neutron and Muon Source can be found at https://www.isis.stfc.ac.uk.
Magnetic Phase Transition in a Highly Disordered Cuprate Near the Percolation Threshold
Abstract: We propose to complete our investigation of the magnetic phase transitions in the highly disordered cuprate LiCu O , a frustrated S=1/2 square-lattice Heisenberg antiferromagnet. The system comprises two types of edge-sharing CuO planes in which magnetic Cu ions are randomly substituted by non-magnetic Li at concentrations of ~20% and ~40%, respectively. While the moderately diluted planes (20%) develop long-range antiferromagnetic order below Tc1 124 K, the more strongly diluted planes (40%) lie close to the classical percolation threshold (pc 0.41) and exhibit a second, poorly understood transition below Tc2 30 K. Our preliminary elastic neutron diffraction measurements on WISH (RB2520339) identify a magnetic propagation vector q = (1/2, 0, 1/2) below Tc1. Initial refinements point to an unusual magnetic state in which the two CuO planes order with mutually orthogonal spin orientations below Tc2, suggesting that Li-induced disorder locally relieves magnetic frustration. To rigorously test and refine this scenario, we request three additional days of beamtime on WISH to obtain a complete dataset from both single-crystal and powder diffraction. This will enable an unambiguous determination of the magnetic ground state and its relationship to disorder-driven frustration in this system.
Principal Investigator: Professor Simon Moser
Experimenter: Mr Carlos Felipe Eugenio Gómez
Local Contact: Dr Dmitry Khalyavin
DOI: 10.5286/ISIS.E.RB2620381
ISIS Experiment Number: RB2620381
| Part DOI | Instrument | Public release date | Download Link |
|---|---|---|---|
| 10.5286/ISIS.E.RB2620381-1 | WISH | 11 October 2029 | Download |
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 Simon Moser et al; (2026): Magnetic Phase Transition in a Highly Disordered Cuprate Near the Percolation Threshold, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2620381
Data is released under the CC-BY-4.0 license.
