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

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

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


Authors

Adam Berlie

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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