Muon-spin relaxation investigation of magnetic bistability in a crystalline organic radical compound

Hernández-Melían, A.; Huddart, B.M.; Pratt, F.L.; Blundell, S.J.; Mills, M.; Young, H.K.S.; Preuss, K.E.; Lancaster, T.

Abstract

We present the results of a muon-spin relaxation (𝜇+SR) investigation of the crystalline organic radicalcompound 4-(2-benzimidazolyl)-1,2,3,5-dithiadiazolyl (HbimDTDA), in which we demonstrate the hystereticmagnetic switching of the system that takes place at 𝑇 = (274 ± 11) K caused by a structural phase transition.Muon-site analysis using electronic structure calculations suggests a range of candidate muon stopping sites.The sites are numerous and similar in energy but, significantly, differ between the two structural phases of thematerial. Despite the difference in the sites, the muon remains a faithful probe of the transition, revealing adynamically-fluctuating magnetically disordered state in the low-temperature structural phase. In contrast, in the high temperature phase the relaxation is caused by static nuclear moments, with rapid electronic dynamics being motionally narrowed from the muon spectra

Citation

Hernández-Melían, A., Huddart, B., Pratt, F., Blundell, S., Mills, M., Young, H., …Lancaster, T. (2023). Muon-spin relaxation investigation of magnetic bistability in a crystalline organic radical compound. Journal of Physics and Chemistry of Solids, 181, https://doi.org/10.1016/j.jpcs.2023.111493

• Journal Article Type: Article
• Acceptance Date: Apr 19, 2023
• Online Publication Date: Jun 21, 2023
• Publication Date: 2023
• Deposit Date: Jun 23, 2023
• Publicly Available Date: Aug 14, 2023
• Journal: Journal of Physics and Chemistry of Solids
• Print ISSN: 0022-3697
• Publisher: Elsevier
• Volume: 181
• DOI: https://doi.org/10.1016/j.jpcs.2023.111493
• Public URL: https://durham-repository.worktribe.com/output/1169312
• Publisher URL: https://www.sciencedirect.com/journal/journal-of-physics-and-chemistry-of-solids