Discriminating ferrotoroidic from antiferrotoroidic ground states using a 3d quantum spin sensor

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Hymas, K, Soncini, A, Vignesh, KR, Chauhan, D, Swain, A, Benjamin, SL ORCID: https://orcid.org/0000-0002-5038-1599, Borah, D, Shanmugam, M, Wernsdorfer, W, Rajaraman, G, Langley, SK and Murray, KS, 2024. Discriminating ferrotoroidic from antiferrotoroidic ground states using a 3d quantum spin sensor. npj Quantum Materials, 9 (1): 106. ISSN 2397-4648

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Official URL: https://doi.org/10.1038/s41535-024-00712-9

Abstract

Molecular toroidal states have come to the forefront as candidates for next-generation quantum information devices owing to their bistability and protection from weak, short-range magnetic interactions. The protection offered by these non-magnetic vortex spin states proves to be a double-edged sword as inferring their existence in a molecular system has yet to be achieved through experimental means alone. Here, we investigate the anomalous, sickle-shaped, single-crystal magnetisation profile arising in μ-SQUID measurements of a novel CrDy3 molecule. Theoretical modelling supported by ab initio calculations demonstrates that the weak field CrDy3 spin dynamics is resultant from quantum superposition of the CrIII spin states determined by three competing interactions: (i) the alignment of the CrIII magnetic moment to the external magnetic field, (ii) the zero-field splitting of the CrIII ground quartet, and (iii) coupling to the remnant magnetisation of the toroidal ground state in the Dy3 triangle. If zero-field splitting of the central transition metal ion is quenched, it operates as a quantum spin sensor, which can be exploited to experimentally discriminate between ferrotoroidic and antiferrotoroidic ground states in MDy6 double triangle complexes through electron paramagnetic resonance experiments and single-crystal magnetisation measurements with a restricted field sweeping domain.

Item Type:	Journal article
Publication Title:	npj Quantum Materials
Creators:	Hymas, K., Soncini, A., Vignesh, K.R., Chauhan, D., Swain, A., Benjamin, S.L., Borah, D., Shanmugam, M., Wernsdorfer, W., Rajaraman, G., Langley, S.K. and Murray, K.S.
Publisher:	Springer Science and Business Media LLC
Date:	2024
Volume:	9
Number:	1
ISSN:	2397-4648
Identifiers:	Number Type 10.1038/s41535-024-00712-9 DOI 2332479 Other
Rights:	© The Author(s) 2024. This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Borcherds
Date Added:	07 Jan 2025 14:49
Last Modified:	07 Jan 2025 14:49
URI:	https://irep.ntu.ac.uk/id/eprint/52795