Issue 12, 2019

Various magnetic states for novel layered cobalt oxides CaCo6O11 and BaCo6O11

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

Supplementary files

Article information

Article type
Research Article
Submitted
14 Aug 2019
Accepted
01 Oct 2019
First published
01 Oct 2019

Mater. Chem. Front., 2019,3, 2696-2701

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, 3, 2696 DOI: 10.1039/C9QM00524B

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