物理学报2017，Vol.66Issue(3)：1-23,23.DOI:10.7498/aps.66.030201
多种有序钙钛矿结构的高压制备与特殊物性
High-pressure synthesis and special physical properties of several ordered p erovskite structures
摘要
Abstract
Strongly correlated electronic systems with ABO3 perovskite and/or perovskite-like structures have received much attention. High pressure is an effective method to prepare perovskites, in particular A-site and/or B-site ordered per-ovskites. In these ordered perovskites, both A and B sites can accommodate transition-metal ions, giving rising to multiple magnetic and electrical interactions between A-A, B-B, and A-B sites. The presence of these new interac-tions can induce a wide variety of interesting physical properties. In this review paper, we will introduce an A-site ordered perovskite with chemical formula AA′3B4O12 and two A-and B-site ordered perovskites with chemical formula AA′3B2B′2O12. All of these compounds can be synthesized only under high pressure. In the A-site ordered LaMn3Cr4O12 with cubic perovskite structure, magnetoelectric multiferroicity with new multiferroic mechanism is found to occur. This is the first observation of multiferroicity appearing in cubic perovskite, thereby opening the way to exploring new multi-ferroic materials and mechanisms. In the A-and B-site ordered perovskite CaCu3Fe2Os2O12, a high ferrimagnetic Curie temperature is observed to be around 580 K. Moreover, this compound exhibits semiconducting conductivity with an energy band gap of about 1 eV. The CaCu3Fe2Os2O12 thus provides a rare single-phase ferrimagnetic semiconductor with high spin ordering temperature well above room temperature as well as considerable energy band gap. Moreover, theoretical calculations point out that the introducing of A′-site Cu2+ magnetic ions can generate strong Cu-Fe and Cu-Os spin interactions. As a result, this A- and B-site ordered perovskite has a much higher Curie temperature than that of the B-site only ordered perovskite Ca2FeOsO6 (～320 K). In addition, we also for the first time prepare another A-and B-site ordered perovskite LaMn3Ni2Mn2O12. In the reported ordered perovskites with Mn3+ at the A′ site, the A′-B intersite spin interaction is usually negligible. In our LaMn3Ni2Mn2O12, however, there exists the considerable A′-B interaction, which is responsible for the rare formation of B-site orthogonal spin structure with net ferromagnetic moment.关键词
高压合成/有序钙钛矿/多铁性/自旋有序Key words
high-pressure synthesis/ordered perovskite/multiferroicity/spin ordering引用本文复制引用
殷云宇,王潇,邓宏芟,周龙,戴建洪,龙有文..多种有序钙钛矿结构的高压制备与特殊物性[J].物理学报,2017,66(3):1-23,23.基金项目
国家重点基础研究发展计划(批准号: 2014CB921500)、国家自然科学基金(批准号: 11574378)和中国科学院先导B项目(批准号:XDB07030300)资助的课题. Project supported by the National Basic Research Program of China (Grant No. 2014CB921500), the National Natural Science Foundation of China (Grant No. 11574378), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07030300). （批准号: 2014CB921500）
