Studies of a Large Odd-Numbered Odd-Electron Metal Ring: Inelastic Neutron Scattering and Muon Spin Relaxation Spectroscopy of Cr8Mn

Michael Baker; T. Lancaster; A. Chiesa; G. Amoretti; P.J. Baker; C. Barker; S.J. Blundell; S. Carretta; David Collison; H.U. Guedel; T. Guidi; Eric Mcinnes; J.S. Moeller; H. Mutka; J. Ollivier; F.L. Pratt; P. Santini; Floriana Tuna; P.L. Tregenna-Piggott; Inigo Vitorica-Yrezabal; Grigore Timco; Richard Winpenny

doi:10.1002/chem.201503431

Studies of a Large Odd-Numbered Odd-Electron Metal Ring: Inelastic Neutron Scattering and Muon Spin Relaxation Spectroscopy of Cr8Mn

Michael Baker, T. Lancaster, A. Chiesa, G. Amoretti, P.J. Baker, C. Barker, S.J. Blundell, S. Carretta, David Collison, H.U. Guedel, T. Guidi, Eric Mcinnes, J.S. Moeller, H. Mutka, J. Ollivier, F.L. Pratt, P. Santini, Floriana Tuna, P.L. Tregenna-Piggott, Inigo Vitorica-YrezabalGrigore Timco, Richard Winpenny

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	1779–1788
Journal	Chemistry: A European Journal
Volume	22
Issue number	5
DOIs	https://doi.org/10.1002/chem.201503431
Publication status	Published - Jan 2016

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10.1002/chem.201503431

Structural Evolution across multiple time and length scales
Withers, P. (PI), Cartmell, S. (CoI), Cernik, R. (CoI), Derby, B. (CoI), Eichhorn, S. (CoI), Freemont, A. (CoI), Hollis, C. (CoI), Mummery, P. (CoI), Sherratt, M. (CoI), Thompson, G. (CoI) & Watts, D. (CoI)
1/06/11 → 31/05/16
Project: Research

CCDC 1402276: Experimental Crystal Structure Determination
Baker, P. J. (Contributor), Lancaster, T. (Contributor), Chiesa, A. (Contributor), Amoretti, G. (Contributor), Baker, P. J. (Contributor), Barker, C. (Contributor), Blundell, S. J. (Contributor), Carretta, S. (Contributor), Collison, D. (Contributor), Güdel, H. U. (Contributor), Guidi, T. (Contributor), Mcinnes, E. (Contributor), Möller, J. S. (Contributor), Mutka, H. (Contributor), Ollivier, J. (Contributor), Pratt, F. L. (Contributor), Santini, P. (Contributor), Tuna, F. (Contributor), Tregenna-Piggott, P. L. (Contributor), Vitorica-Yrezabal, I. (Contributor), Timco, G. (Contributor) & Winpenny, R. (Contributor), Cambridge Crystallographic Data Centre, 1 Jan 2016
DOI: 10.5517/cc1j25qh, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/cc1j25qh&sid=DataCite
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Baker, M., Lancaster, T., Chiesa, A., Amoretti, G., Baker, P. J., Barker, C., Blundell, S. J., Carretta, S., Collison, D., Guedel, H. U., Guidi, T., Mcinnes, E., Moeller, J. S., Mutka, H., Ollivier, J., Pratt, F. L., Santini, P., Tuna, F., Tregenna-Piggott, P. L., ... Winpenny, R. (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

@article{0aece386705f4983ad50eaa70e6c7e21,

title = "Studies of a Large Odd-Numbered Odd-Electron Metal Ring: Inelastic Neutron Scattering and Muon Spin Relaxation Spectroscopy of Cr8Mn",

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.",

author = "Michael Baker and T. Lancaster and A. Chiesa and G. Amoretti and P.J. Baker and C. Barker and S.J. Blundell and S. Carretta and David Collison and H.U. Guedel and T. Guidi and Eric Mcinnes and J.S. Moeller and H. Mutka and J. Ollivier and F.L. Pratt and P. Santini and Floriana Tuna and P.L. Tregenna-Piggott and Inigo Vitorica-Yrezabal and Grigore Timco and Richard Winpenny",

year = "2016",

month = jan,

doi = "10.1002/chem.201503431",

language = "English",

volume = "22",

pages = "1779–1788",

journal = "Chemistry: A European Journal",

issn = "0947-6539",

publisher = "John Wiley & Sons Ltd",

number = "5",

}

Baker, M, Lancaster, T, Chiesa, A, Amoretti, G, Baker, PJ, Barker, C, Blundell, SJ, Carretta, S, Collison, D, Guedel, HU, Guidi, T, Mcinnes, E, Moeller, JS, Mutka, H, Ollivier, J, Pratt, FL, Santini, P, Tuna, F, Tregenna-Piggott, PL, Vitorica-Yrezabal, I, Timco, G & Winpenny, R 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, vol. 22, no. 5, pp. 1779–1788. https://doi.org/10.1002/chem.201503431

TY - JOUR

T1 - Studies of a Large Odd-Numbered Odd-Electron Metal Ring: Inelastic Neutron Scattering and Muon Spin Relaxation Spectroscopy of Cr8Mn

AU - Baker, Michael

AU - Lancaster, T.

AU - Chiesa, A.

AU - Amoretti, G.

AU - Baker, P.J.

AU - Barker, C.

AU - Blundell, S.J.

AU - Carretta, S.

AU - Collison, David

AU - Guedel, H.U.

AU - Guidi, T.

AU - Mcinnes, Eric

AU - Moeller, J.S.

AU - Mutka, H.

AU - Ollivier, J.

AU - Pratt, F.L.

AU - Santini, P.

AU - Tuna, Floriana

AU - Tregenna-Piggott, P.L.

AU - Vitorica-Yrezabal, Inigo

AU - Timco, Grigore

AU - Winpenny, Richard

PY - 2016/1

Y1 - 2016/1

N2 - 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.

AB - 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.

U2 - 10.1002/chem.201503431

DO - 10.1002/chem.201503431

M3 - Article

SN - 0947-6539

VL - 22

SP - 1779

EP - 1788

JO - Chemistry: A European Journal

JF - Chemistry: A European Journal

IS - 5

ER -

Studies of a Large Odd-Numbered Odd-Electron Metal Ring: Inelastic Neutron Scattering and Muon Spin Relaxation Spectroscopy of Cr8Mn

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Structural Evolution across multiple time and length scales

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CCDC 1402276: Experimental Crystal Structure Determination

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