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Studies of a large odd-numbered odd-electron metal ring : inelastic neutron scattering and muon spin relaxation spectroscopy of Cr8Mn.

Baker, Michael L. and Lancaster, Tom and Chiesa, Alessandro and Amoretti, Giuseppe and Baker, Peter J. and Barker, Claire and Blundell, Stephen J. and Carretta, Stefano and Collison, David and Güdel, Hans U. and Guidi, Tatiana and McInnes, Eric J. L. and Möller, Johannes S. and Mutka, Hannu and Ollivier, Jacques and Pratt, Francis L. and Santini, Paolo and Tuna, Floriana and Tregenna-Piggott, Philip L. W. and Vitorica-Yrezabal, Iñigo J. and Timco, Grigore A. and Winpenny, Richard E. P. (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). pp. 1779-1788.


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.

Item Type:Article
Keywords:Inelastic neutron scattering, Molecular magnetism, Muon spin relaxation, Spin chirality, Spin frustration.
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Publisher 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.
Date accepted:28 August 2015
Date deposited:16 February 2016
Date of first online publication:08 January 2016
Date first made open access:16 February 2016

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