SrV0.3Fe0.7O2.8: A Vacancy-Ordered Fe-Based Perovskite Exhibiting Room-Temperature Magnetoresistance

• Published in: Inorganic chemistry 2022-06, Vol.61 (24), p.8987-8991
• Main Authors: Nagase, Teppei, Nishikubo, Takumi, Fukuda, Masayuki, Sakai, Yuki, Shigematsu, Kei, Ikeda, Yoichi, Nambu, Yusuke, Zhang, Qiang, Matsuda, Masaaki, Mibu, Ko, Azuma, Masaki, Yamamoto, Takafumi
• Format: Article
• Language: English
• Subjects: chemical structure; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; ions; layers; magnetic properties; perovskites
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.2c01137

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)p 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, SrV0.3Fe0.7O2.8 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 μB/Fe atom). Thus, this type of layered compound is promising for further large MR by an increase of magnetization through chemical substitution.