No evidence for room temperature ferromagnetism in the high temperature metal-organic material: Ni2TCNQ

Berlie, Adam; Terry, Ian; Szablewski, Marek; Quinn, Kimberly

doi:10.1088/1361-648x/abb545

No evidence for room temperature ferromagnetism in the high temperature metal-organic material: Ni2TCNQ

Berlie, Adam; Terry, Ian; Szablewski, Marek; Quinn, Kimberly

Authors

Adam Berlie

Dr Ian Terry ian.terry@durham.ac.uk
Associate Professor

Professor Marek Szablewski marek.szablewski@durham.ac.uk
Professor

Kimberly Quinn

Abstract

The search for ferromagnetic organic-based compounds has been a particular challenge to both chemists and physicists over the past few decades. The synthesis of the Ni2A, where A is an organic acceptor; tetracyanoethene (TCNE), 3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) or 7,7,8,8-tetracyanoquinodimethane (TCNQ) (Jain et al 2007 Nature 445 291), was reported to be a great advancement with claims that the ferromagnetism persisted to well above room temperature. There were, however some substantial flaws in the methodology associated with the synthesis and physical characterisation. Our work solely studies the Ni2TCNQ compound where we find no evidence for the existence of inherent ferromagnetism within the material that was reported in the original paper. Instead, we find that the magnetism is due to superparamagnetic nickel nanoparticles embedded in an amorphous matrix. It is hoped that our work will also show that one must be careful when using Ni(COD)2 as a precursor in the synthesis of magnetic materials and that the usefulness of the reported synthetic method is extremely limited.

Citation

Berlie, A., Terry, I., Szablewski, M., & Quinn, K. (2020). No evidence for room temperature ferromagnetism in the high temperature metal-organic material: Ni2TCNQ. Journal of Physics: Condensed Matter, 33(6), https://doi.org/10.1088/1361-648x/abb545

Journal Article Type	Article
Acceptance Date	Sep 4, 2020
Online Publication Date	Nov 6, 2020
Publication Date	Nov 6, 2020
Deposit Date	Jan 9, 2021
Publicly Available Date	Nov 6, 2021
Journal	Journal of Physics: Condensed Matter
Print ISSN	0953-8984
Electronic ISSN	1361-648X
Publisher	IOP Publishing
Peer Reviewed	Peer Reviewed
Volume	33
Issue	6
DOI	https://doi.org/10.1088/1361-648x/abb545

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Copyright Statement
This is the Accepted Manuscript version of an article accepted for publication 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 https://doi.org/10.1088/1361-648X/abb545