Michael L. Baker
Studies of a Large Odd-Numbered Odd-Electron Metal Ring: Inelastic Neutron Scattering and Muon Spin Relaxation Spectroscopy of Cr8Mn
Baker, Michael L.; Lancaster, Tom; Chiesa, Alessandro; Amoretti, Giuseppe; Baker, Peter J.; Barker, Claire; Blundell, Stephen J.; Carretta, Stefano; Collison, David; Güdel, Hans U.; Guidi, Tatiana; McInnes, Eric J.L.; Möller, Johannes S.; Mutka, Hannu; Ollivier, Jacques; Pratt, Francis L.; Santini, Paolo; Tuna, Floriana; Tregenna-Piggott, Philip L.W.; Vitorica-Yrezabal, Iñigo J.; Timco, Grigore A.; Winpenny, Richard E.P.
Authors
Professor Tom Lancaster tom.lancaster@durham.ac.uk
Professor
Alessandro Chiesa
Giuseppe Amoretti
Peter J. Baker
Claire Barker
Stephen J. Blundell
Stefano Carretta
David Collison
Hans U. Güdel
Tatiana Guidi
Eric J.L. McInnes
Johannes S. Möller
Hannu Mutka
Jacques Ollivier
Francis L. Pratt
Paolo Santini
Floriana Tuna
Philip L.W. Tregenna-Piggott
Iñigo J. Vitorica-Yrezabal
Grigore A. Timco
Richard E.P. Winpenny
Abstract
The spin dynamics of Cr8Mn, a nine-membered antiferromagnetic (AF) molecular nanomagnet, are investigated. Cr8Mn is a rare example of a large odd-membered AF ring, and has an odd-number of 3d-electrons present. Odd-membered AF rings are unusual and of interest due to the presence of competing exchange interactions that result in frustrated-spin ground states. The chemical synthesis and structures of two Cr8Mn variants that differ only in their crystal packing are reported. Evidence of spin frustration is investigated by inelastic neutron scattering (INS) and muon spin relaxation spectroscopy (μSR). From INS studies we accurately determine an appropriate microscopic spin Hamiltonian and we show that μSR is sensitive to the ground-spin-state crossing from S=1/2 to S=3/2 in Cr8Mn. The estimated width of the muon asymmetry resonance is consistent with the presence of an avoided crossing. The investigation of the internal spin structure of the ground state, through the analysis of spin-pair correlations and scalar-spin chirality, shows a non-collinear spin structure that fluctuates between non-planar states of opposite chiralities.
Citation
Baker, M. L., Lancaster, T., Chiesa, A., Amoretti, G., Baker, P. J., Barker, C., …Winpenny, R. E. (2016). Studies of a Large Odd-Numbered Odd-Electron Metal Ring: Inelastic Neutron Scattering and Muon Spin Relaxation Spectroscopy of Cr8Mn. Chemistry - A European Journal, 22(5), 1779-1788. https://doi.org/10.1002/chem.201503431
Journal Article Type | Article |
---|---|
Acceptance Date | Aug 28, 2015 |
Online Publication Date | Jan 8, 2016 |
Publication Date | Jan 26, 2016 |
Deposit Date | Jan 13, 2016 |
Publicly Available Date | Feb 16, 2016 |
Journal | Chemistry - A European Journal |
Print ISSN | 0947-6539 |
Electronic ISSN | 1521-3765 |
Publisher | Wiley |
Peer Reviewed | Peer Reviewed |
Volume | 22 |
Issue | 5 |
Pages | 1779-1788 |
DOI | https://doi.org/10.1002/chem.201503431 |
Keywords | Inelastic neutron scattering, Molecular magnetism, Muon spin relaxation, Spin chirality, Spin frustration. |
Public URL | https://durham-repository.worktribe.com/output/1391629 |
Related Public URLs | https://www.escholar.manchester.ac.uk/jrul/item/?pid=uk-ac-man-scw:296313 |
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/
Copyright Statement
© 2016 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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