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Driving a Molecular Spin-Peierls System into a Short Range Ordered State through Chemical Substitution

Berlie, Adam; Terry, Ian; Szablewski, Marek

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Abstract

Chemically altering molecules can have dramatic effects on the physical properties of a series of very similar molecular compounds. A good example of this is within the quasi-1D spin-Peierls system potassium TCNQ (TCNQ = 7,7,8,8-tetracyanoqunidimethane), where substitution of TCNQF4
for TCNQ has a dramatic effect on the 1D interactions, resulting in a drop in the corresponding spin-Peierls transition temperature. Within this work, we extend the investigation to potassium TCNQBr2
, where only two protons of TCNQ can be substituted with bromine atoms due to steric constraints. The new system exhibits evidence for a residual component of the magnetism when probed via magnetic susceptibility measurements and muon spin spectroscopy. The observations suggest that the system is dominated by short range, and potentially disordered, correlations within the bulk phase.

Citation

Berlie, A., Terry, I., & Szablewski, M. (2023). Driving a Molecular Spin-Peierls System into a Short Range Ordered State through Chemical Substitution. Magnetochemistry, 9(6), Article 150. https://doi.org/10.3390/magnetochemistry9060150

Journal Article Type Article
Acceptance Date Jun 6, 2023
Online Publication Date Jun 8, 2023
Publication Date 2023-06
Deposit Date Nov 8, 2023
Publicly Available Date Nov 8, 2023
Journal Magnetochemistry
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 9
Issue 6
Article Number 150
DOI https://doi.org/10.3390/magnetochemistry9060150
Keywords Materials Chemistry; Chemistry (miscellaneous); Electronic, Optical and Magnetic Materials
Public URL https://durham-repository.worktribe.com/output/1901136

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