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Various magnetic states for novel layered cobalt oxides CaCo6O11 and BaCo6O11

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Abstract

Novel layered cobalt oxides ACo6O11 (A = Ca, Ba) have been synthesized under high-pressure and high-temperature conditions of 8 GPa and 1373 K, respectively. Both oxides crystallize in magnetoplumbite-related structures with hexagonal symmetry of the space group (P63/mmc, no. 194), as well as SrCo6O11. The magnetic ground state systematically transforms from antiferromagnetic-like (CaCo6O11) to ferrimagnetic (SrCo6O11) to ferromagnetic (BaCo6O11) by changing the A-site ion. These magnetic transitions are dominated by the superexchange interactions between magnetic CoO5 trigonal bipyramids. Furthermore, CaCo6O11 exhibits a magnetic-field-driven phase transition from an antiferromagnetic-like to a ferrimagnetic state. Rietveld analysis indicates that the overall magnetic phase diagram for the ACo6O11 series provides a wide variety of electronic states induced by structure and the magnetic field.

Graphical abstract: Various magnetic states for novel layered cobalt oxides CaCo6O11 and BaCo6O11

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Publication details

The article was received on 14 Aug 2019, accepted on 01 Oct 2019 and first published on 01 Oct 2019


Article type: Research Article
DOI: 10.1039/C9QM00524B
Mater. Chem. Front., 2019, Advance Article

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    Various magnetic states for novel layered cobalt oxides CaCo6O11 and BaCo6O11

    I. Yamada, F. Toda, S. Kawaguchi and M. d'Astuto, Mater. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QM00524B

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