SrVFeO：一种具有室温磁电阻的空位有序铁基钙钛矿。

SrVFeO: A Vacancy-Ordered Fe-Based Perovskite Exhibiting Room-Temperature Magnetoresistance.

作者信息

Nagase Teppei, Nishikubo Takumi, Fukuda Masayuki, Sakai Yuki, Shigematsu Kei, Ikeda Yoichi, Nambu Yusuke, Zhang Qiang, Matsuda Masaaki, Mibu Ko, Azuma Masaki, Yamamoto Takafumi

机构信息

Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan.

Kanagawa Institute of Industrial Science and Technology, Ebina 243-0435, Japan.

出版信息

Inorg Chem. 2022 Jun 3. doi: 10.1021/acs.inorgchem.2c01137.

DOI:10.1021/acs.inorgchem.2c01137

PMID:35657337

Abstract

We report room-temperature (RT) magnetoresistance (MR) in a novel Fe-based perovskite, SrVFeO. This compound contains ordered oxygen vacancies in every fifth primitive perovskite (111) plane, leading to a layered structure consisting of triple-octahedral and double-tetrahedral layers. Along with the oxygen vacancies, the transition-metal ions are also ordered: the octahedral sites are occupied by 100% of Fe ions, while the tetrahedral sites are occupied by 25% of Fe ions and 75% of V ions. As a result, SrVFeO forms a magnetically striped lattice in which the octahedral layers with 100% of magnetic Fe ions are separated by the diluted magnetic layer. The compound exhibits weak ferromagnetism and shows a large negative MR (-5% at 3 T) at RT, despite the small saturation moment (0.4 μ/Fe atom). Thus, this type of layered compound is promising for further large MR by an increase of magnetization through chemical substitution.

摘要

我们报道了一种新型铁基钙钛矿SrVFeO中的室温磁电阻（MR）。该化合物在每五个原始钙钛矿（111）平面中含有有序的氧空位，导致形成由三重八面体层和双四面体层组成的层状结构。除了氧空位，过渡金属离子也是有序排列的：八面体位点被100%的Fe离子占据，而四面体位点被25%的Fe离子和75%的V离子占据。结果，SrVFeO形成了一个磁条纹晶格，其中含有100%磁性Fe离子的八面体层被稀释磁性层隔开。该化合物表现出弱铁磁性，尽管饱和磁矩较小（每Fe原子0.4 μ），但在室温下仍显示出较大的负磁电阻（在3 T时为-5%）。因此，通过化学取代增加磁化强度，这种类型的层状化合物有望实现更大的磁电阻。