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

被引：25

作者：

Baker, Michael L. ^{[1
,2
,3
]}

Lancaster, Tom ^{[4
]}

Chiesa, Alessandro ^{[5
]}

Amoretti, Giuseppe ^{[5
]}

Baker, Peter J. ^{[6
]}

Barker, Claire ^{[1
,2
]}

Blundell, Stephen J. ^{[7
]}

Carretta, Stefano ^{[5
]}

Collison, David ^{[1
,2
]}

Guedel, Hans U. ^{[8
]}

Guidi, Tatiana ^{[6
]}

McInnes, Eric J. L. ^{[1
,2
]}

Moeller, Johannes S. ^{[7
]}

Mutka, Hannu ^{[3
]}

Ollivier, Jacques ^{[3
]}

Pratt, Francis L. ^{[6
]}

Santini, Paolo ^{[5
]}

Tuna, Floriana ^{[1
,2
]}

Tregenna-Piggott, Philip L. W. ^{[8
]}

Vitorica-Yrezabal, Inigo J. ^{[1
,2
]}

Timco, Grigore A. ^{[1
,2
]}

Winpenny, Richard E. P. ^{[1
,2
]}

机构：

[1] Univ Manchester, Sch Chem, Oxford Rd, Manchester M13 9PL, Lancs, England

[2] Univ Manchester, Photon Sci Inst, Oxford Rd, Manchester M13 9PL, Lancs, England

[3] Inst Laue Langevin, BP 156,6 Rue Jules Horowitz, F-38042 Grenoble 9, France

[4] Univ Durham, Dept Phys, S Rd, Durham DH1 3LE, England

[5] Univ Parma, Dipartimento Fis & Sci Terra, I-43124 Parma, Italy

[6] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[7] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[8] Univ Bern, Dept Chem & Biochem, CH-3000 Bern, Switzerland

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2016年 / 22卷 / 05期

基金：

英国工程与自然科学研究理事会; 欧盟第七框架计划;

关键词：

inelastic neutron scattering; molecular magnetism; muon spin relaxation; spin chirality; spin frustration; MOLECULAR NANOMAGNETS; CRYSTAL-STRUCTURE; SPECTROMETER; FRUSTRATION; ANISOTROPY; MAGNETS; WHEEL;

D O I：

10.1002/chem.201503431

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 (mu SR). From INS studies we accurately determine an appropriate microscopic spin Hamiltonian and we show that mu SR 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.

引用

页码：1779 / 1788

页数：10

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