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

Berlie, Adam; Terry, Ian; Szablewski, Marek

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
• Electronic ISSN: 2312-7481
• 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