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Magnetic ordering of defects in a molecular spin-Peierls system

Berlie, A.; Terry, I.; Cottrell, S.; Pratt, F.L.; Szablewski, M.

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A. Berlie

S. Cottrell

F.L. Pratt


With interest in charge transfer compounds growing steadily, it is important to understand all aspects of the underlying physics of these systems, including the properties of the defects and interfaces that are universally present in actual experimental systems. For the study of these defects and their interactions a spin-Peierls (SP) system provides a useful testing ground. This work presents an investigation within the SP phase of potassium TCNQF4 where anomalous features are observed in both the magnetic susceptibility and ESR spectra for temperatures between 60 K and 100 K. Muon spin spectroscopy measurements confirm the presence of these anomalous magnetic features, with low temperature zero-field data exhibiting the damped oscillatory form that is a characteristic signature of static magnetic order. This ordering is most likely due to the interaction between structurally correlated magnetic defects in the system. The critical behaviour of the temperature dependent muon spin rotation frequency indicates that a 2D Ising model is applicable to the magnetic ordering of these defects. We show that these observations can be explained by a simple model in which the magnetic defects are located at stacking faults, which provide them with a 2D structural framework to constrain their interactions.


Berlie, A., Terry, I., Cottrell, S., Pratt, F., & Szablewski, M. (2017). Magnetic ordering of defects in a molecular spin-Peierls system. Journal of Physics: Condensed Matter, 29(2), Article 025809.

Journal Article Type Article
Acceptance Date Oct 3, 2016
Online Publication Date Nov 14, 2016
Publication Date Jan 18, 2017
Deposit Date Nov 15, 2016
Publicly Available Date Nov 14, 2017
Journal Journal of Physics: Condensed Matter
Print ISSN 0953-8984
Electronic ISSN 1361-648X
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 29
Issue 2
Article Number 025809


Accepted Journal Article (894 Kb)

Copyright Statement
This is an author-created, un-copyedited version of an article published in Journal of Physics: Condensed Matter. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at

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