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Investigation of the role of morphology on the magnetic properties of Ca2Mn3O8 materials

Vera Stimpson, Laura Josephine, Ramos, Silvia, Stenning, Gavin B. G., Jura, Marek, Parry, Stephen, Cibin, Giannantonio, Arnold, Donna C. (2017) Investigation of the role of morphology on the magnetic properties of Ca2Mn3O8 materials. Dalton Transactions, 46 (41). pp. 14130-14138. ISSN 1477-9226. E-ISSN 1477-9234. (doi:10.1039/C7DT03053C)

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Abstract

Ca2Mn3O8 exhibits a complex layered structure comprised of Mn3O84? layers separated by Ca2+ ions. In contrast with the more traditional triangular delafossite layered materials the Mn3O84? layers additionally exhibit an ordered vacancy, which forms a ‘bow-tie’ like arrangement of the Mn4+ ions. We report a comprehensive study of the magnetic properties of a series of Ca2Mn3O8 materials with different morphologies. EXAFS and XANES analysis confirm no differences in either manganese environment or oxidation state between materials. Apparent differences in magnetic order from SQUID magnetometry can be rationalised by uncompensated surface spins arising as a result of changes to the surface to volume ratio between morphologies. Furthermore, these data suggest these materials are potentially frustrated in nature, due to the triangular connectivity of Mn4+ spins, with a simple ‘spin-up/spin-down’ (??) antiferromagnetic model unable to explain the data collected.

Item Type: Article
DOI/Identification number: 10.1039/C7DT03053C
Uncontrolled keywords: Physics of Quantum Materials
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Donna Arnold
Date Deposited: 30 Oct 2017 12:41 UTC
Last Modified: 17 Jul 2019 10:00 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/64166 (The current URI for this page, for reference purposes)
Ramos, Silvia: https://orcid.org/0000-0003-2725-7706
Arnold, Donna C.: https://orcid.org/0000-0003-0239-5790
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