Quantum Spin 1/2 Dimers in a Low Dimensional Tetrabromocuprate Magnet

Sampson, Gavin; Bristowe, Nicholas C.; Carr, Sam T.; Saib, Asad; Stenning, Gavin B.G.; Clark, Ewan R.; Saines, Paul James

Abstract

This work describes a homometallic spin-urn:x-wiley:09476539:media:chem202200855:chem202200855-math-0001 tetrabromocuprate adopting a bilayer structure. Magnetic-susceptibility measurements show a broad maximum centred near 70 K, with fits to this data using a Heisenberg model consistent with strong antiferromagnetic coupling between neighbouring copper atoms in different layers of the bilayer. There are further weak intralayer ferromagnetic interactions between copper cations in neighbouring dimers. First-principles calculations are consistent with this, but suggest there is only significant magnetic coupling within one direction of a layer; this would suggest the presence of a spin ladder within the bilayer with antiferromagnetic rung and weaker ferromagnetic rail couplings.

Citation

Sampson, G., Bristowe, N. C., Carr, S. T., Saib, A., Stenning, G. B., Clark, E. R., & Saines, P. J. (2022). Quantum Spin 1/2 Dimers in a Low Dimensional Tetrabromocuprate Magnet. Chemistry - A European Journal, 28(32), Article e202200855. https://doi.org/10.1002/chem.202200855

• Journal Article Type: Article
• Acceptance Date: Mar 30, 2022
• Online Publication Date: Apr 27, 2022
• Publication Date: Jun 7, 2022
• Deposit Date: Apr 6, 2022
• Publicly Available Date: Jun 23, 2022
• Journal: Chemistry – A European Journal
• Print ISSN: 0947-6539
• Electronic ISSN: 1521-3765
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 28
• Issue: 32
• Article Number: e202200855
• DOI: https://doi.org/10.1002/chem.202200855
• Public URL: https://durham-repository.worktribe.com/output/1209202