SrV<sub>0.3</sub>Fe<sub>0.7</sub>O<sub>2.8</sub>: A Vacancy-Ordered Fe-Based Perovskite Exhibiting Room-Temperature Magnetoresistance
SrV<sub>0.3</sub>Fe<sub>0.7</sub>O<sub>2.8</sub>: A Vacancy-Ordered Fe-Based Perovskite Exhibiting Room-Temperature Magnetoresistance
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SrV<sub>0.3</sub>Fe<sub>0.7</sub>O<sub>2.8</sub>：一种具有室温磁阻的空位有序铁基钙钛矿
DOI：
10.1021/acs.inorgchem.2c01137
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发表时间：
2022
影响因子：
4.6
通讯作者：
Yamamoto Takafumi
中科院分区：
文献类型：
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作者：
Nagase Teppei;Nishikubo Takumi;Fukuda Masayuki;Sakai Yuki;Shigematsu Kei;Ikeda Yoichi;Nambu Yusuke;Zhang Qiang;Matsuda Masaaki;Mibu Ko;Azuma Masaki;Yamamoto Takafumi
我们报告室温（RT）磁电阻（MR）在一种新型的铁基钙钛矿，SrV0.3Fe0.7O2.8。该化合物在每五个原始钙钛矿（111）p平面中含有有序的氧空位，导致由三八面体和双四面体层组成的层状结构。沿着氧空位，过渡金属离子也是有序的：八面体位置被100%的Fe离子占据，而四面体位置被25%的Fe离子和75%的V离子占据。结果，SrV0.3Fe0.7O2.8形成磁性条纹晶格，其中具有100%磁性Fe离子的八面体层被稀磁层分离。该化合物表现出弱铁磁性，并且在室温下表现出很大的负MR（3 T时为-5%），尽管饱和矩很小（0.4 μB/Fe原子）。因此，这种类型的层状化合物是有前途的进一步大MR通过增加磁化通过化学取代。
We report room-temperature (RT) magnetoresistance (MR) in a novel Fe-based perovskite, SrV0.3Fe0.7O2.8. This compound contains ordered oxygen vacancies in every fifth primitive perovskite (111)pplane, 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, SrV0.3Fe0.7O2.8forms 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 μB/Fe atom). Thus, this type of layered compound is promising for further large MR by an increase of magnetization through chemical substitution.