ISIS Neutron and Muon Source Data Journal

Magnetic excitations in a magnetized double ladder Cu-CPA

Abstract: Quantum spin ladders bridge the gap between one- and two-dimensional quantum magnets. They feature a complex excitation spectrum that depends on the relative strengths of the leg and rung exchange interactions. While realizations of strong-rung ladders are common, only one strong-leg spin ladder has been studied in detail to date. However, a recent breakthrough in material synthesis, allows us to study a second candidate for the strong-leg regime: (C5H9NH3)2CuBr4 (or Cu-CPA for short). Combining X-ray and neutron scattering, we have found that Cu-CPA, which was initially believed to be a simple spin ladder system, represents the more complex case of a double ladder system, which remains to be explored [1]. Our zero-field inelastic neutron-scattering experiment shows no dispersion perpendicular to the ladder propagation direction, confirming this is indeed a purely one-dimensional system. Additionally, we observed two distinct low-energy modes that are consistent with a double ladder [2]. Preliminary measurements under applied magnetic field hint toward only a partial mode-softening. Therefore, we propose to use neutron spectroscopy under externally applied magnetic fields to study the condensation of magnons and understand the magnetization processes in this double ladder system. [1] Philippe et. al., submitted to PRB, https://arxiv.org/abs/2404.08274 [2] Philippe et. al., in preparation

Principal Investigator: Mr Jonas Philippe
Experimenter: Mr Gediminas Simutis
Experimenter: Dr Marc Janoschek
Experimenter: Professor Martin Mansson
Experimenter: Professor Yasmine Sassa
Experimenter: Mr Frank Elson
Local Contact: Dr Ross Stewart
Experimenter: Dr David Tam
Experimenter: Dr Alysia Lake

DOI: 10.5286/ISIS.E.RB2420219

ISIS Experiment Number: RB2420219

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:
Mr Jonas Philippe et al; (2025): Magnetic excitations in a magnetized double ladder Cu-CPA, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2420219

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