Abstract The crystal and magnetic structures of the frustrated Co3O4 spinel oxide have been studied by means of neutron diffraction at high pressures up to 8.7 GPa in the temperature range 5–300 K. At ambient pressure, a coexistence of the long range ordered antiferromagnetic (AFM) phase and short range disordered phase below TN = 33 K was observed. At pressures above 2 GPa, a suppression of the magnetically disordered phase and stabilization of the AFM phase, characterized by rapid increase of the Neel temperature in 1.5 times from 33 to 51 K with a pressure coefficient dTN/dP = 2.1 K/GPa occur. The observed phenomena are analyzed in terms of the competing nearest neighbor and next nearest neighbor magnetic interactions. In addition to the A-O-B-O-A nearest neighbor superexchange, an important role of the A-O-O-A next nearest neighbor superexchange interactions in magnetic behavior of Co3O4 is pointed out.

中文翻译：

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高压对 Co3O4 晶体和磁性结构的影响

摘要 在高达 8.7 GPa 的高压和 5-300 K 的温度范围内，通过中子衍射研究了受挫 Co3O4 尖晶石氧化物的晶体和磁性结构。在环境压力下，长程有序反铁磁性 (AFM) 共存。 ) 相和低于 TN = 33 K 的短程无序相被观察到。在高于 2 GPa 的压力下，发生磁无序相的抑制和 AFM 相的稳定，其特征是尼尔温度从 33 K 快速增加到 51 K 的 1.5 倍，压力系数 dTN/dP = 2.1 K/GPa。根据竞争最近邻和下一个最近邻磁相互作用分析观察到的现象。除了 AOBOA 最近邻超级交换，