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.
Spin-liquid regime in a single-trillium S=1/2 langbeinite K2Ti2(PO4)3
Abstract: Quantum spin liquids (QSLs), marked by the absence of long-range magnetic order (LRO) due to quantum fluctuations, are explored in geometrically frustrated systems. Recent studies highlight materials like K?Ni?(SO?)?, with interconnected trillium lattices, which show dynamic ground states despite weak Bragg peaks. However, S=1/2 systems on single trillium lattices remain underexplored. We present K?Ti?(PO?)?, a langbeinite with Tił? (S=1/2) on a single trillium lattice?analogous to MnSi but with localized moments. Magnetization data show no LRO down to 0.3 K, consistent with antiferromagnetic interactions (Curie-Weiss ? ? -30 K). AC susceptibility reveals a broad maximum near 0.2 K, while zero-field muon spin relaxation (?SR) down to 30 mK confirms a dynamic ground state without static order, persisting under 2 T fields. This contrasts double trillium systems like K?Ni?(SO?)?, where dynamics freeze near 1?2 K despite weaker frustration (? = -18 K). To probe the link between exchange interactions (?|?|) and dynamics, we propose zero-field ?SR across 2?300 K. Temperature-dependent relaxation rates will test if the energy scale governs dynamics, addressing why K?Ti?(PO?)? remains dynamic below |?|. Measurements from 2?20 K (overlapping prior data), 20?100 K (log steps), and up to 300 K will map thermal evolution. This work identifies K?Ti?(PO?)? as a rare S=1/2 trillium candidate for QSL behavior, advancing understanding of frustration in 3D quantum magnets.
Principal Investigator: Dr Ivica Zivkovic
Experimenter: Professor Henrik Ronnow
Local Contact: Dr John Wilkinson
Experimenter: Mrs Berna Esmer
DOI: 10.5286/ISIS.E.RB2520577
ISIS Experiment Number: RB2520577
| Part DOI | Instrument | Public release date | Download Link |
|---|---|---|---|
| 10.5286/ISIS.E.RB2520577-1 | MUSR | 16 October 2028 | Download |
Publisher: STFC ISIS Neutron and Muon Source
Data format: RAW/Nexus
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Data Citation
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publication is as:
[author], [date], [title], [publisher],
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For Example:
Dr Ivica Zivkovic et al; (2025): Spin-liquid regime in a single-trillium S=1/2 langbeinite K2Ti2(PO4)3, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2520577
Data is released under the CC-BY-4.0 license.
