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Various magnetic states for novel layered cobalt oxides CaCo6O11 and BaCo6O11

机译:各种新型层状钴磁州氧化物CaCo6O11和BaCo6O11

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摘要

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.
机译:新型层状钴氧化物ACo6O11 (= Ca, Ba)高压下合成和高- 8 GPa和1373 K的温度条件,分别。磁铁铅矿相关结构六角对称的空间群(P63 / mmc,不。从基态系统转换antiferromagnetic-like (CaCo6O11)亚铁磁性(SrCo6O11)铁磁(BaCo6O11)改变一个网站的离子。转换由超交换磁CoO5三角形之间的相互作用双锥体。magnetic-field-driven从一个阶段过渡antiferromagnetic-like亚铁磁性状态。里特维德分析表明,整体ACo6O11系列磁性相图提供各种各样的电子状态引起结构和磁场。

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