A-site ordered quadruple perovskite oxides AA03B4O12

• 作者: 龙有文
• 来源期刊: 中国物理B（英文版）
• 关键词: high-pressure synthesis A-site ordered perovskite charge transfer multiferroicity
• 年，卷（期）: 2016,（7）
• 页码范围: 078108-1-078108-13
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/25/7/078108

摘要

The A-site ordered perovskite oxides with chemical formula AA03B4O12 display many intriguing physical properties due to the introduction of transition metals at both A0 and B sites. Here, research on the recently discovered intermetallic charge transfer occurring between A0-site Cu and B-site Fe ions in LaCu3Fe4O12 and its analogues is reviewed, along with work on the magnetoelectric multiferroicity observed in LaMn3Cr4O12 with cubic perovskite structure. The Cu–Fe intermetallic charge transfer (LaCu3+3 Fe3+4 O12→LaCu2+3 Fe3.75+4 O12) leads to a first-order isostructural phase transition accompanied by drastic variations in magnetism and electrical transport properties. The LaMn3Cr4O12 is a novel spin-driven multiferroic system with strong magnetoelectric coupling effects. The compound is the first example of cubic perovskite multiferroics to be found. It opens up a new arena for studying unexpected multiferroic mechanisms.