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Magnetostructural relationship in the tetrahedral spin-chain oxide CsCoO2.

Ali, N. Z. and Williams, R. C. and Xiao, F. and Clark, S. J. and Lancaster, T. and Blundell, S. J. and Sheptyakov, D. V. and Jansen, M. (2015) 'Magnetostructural relationship in the tetrahedral spin-chain oxide CsCoO2.', Physical review B., 91 (2). 024419.


We have investigated the structural and magnetic transitions in CsCoO2 using calorimetric measurements, neutron powder diffraction, density functional theory calculations, and muon-spin relaxation measurements. CsCoO2 exhibits three-dimensional long-range antiferromagnetic (AFM) order at 424 K, resulting in antiferromagnetic alignment of chains of ferromagnetically ordered Co-Co spin dimers. Although there is no change in magnetic structure around a structural transition at T∗=100 K, the resulting bifurcation of corner-shared Co-O-Co bond angles causes a weakening of the AFM interaction for one set of bonds along the chains. Consequently, the system undergoes a complex freezing out of relaxation processes on cooling.

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Publisher statement:Reprinted with permission from the American Physical Society: Physical Review B 91, 024419 © 2015 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:No date available
Date deposited:27 April 2015
Date of first online publication:20 January 2015
Date first made open access:No date available

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