材料科学
外延
磁电阻
居里温度
钙钛矿(结构)
凝聚态物理
磁化
微观结构
超巨磁阻效应
饱和(图论)
铁磁性
纳米技术
结晶学
复合材料
磁场
化学
图层(电子)
物理
组合数学
量子力学
数学
作者
Mingfeng Chen,Shanyong Bao,Yang Zhang,Yujia Wang,Yuhan Liang,Jialu Wu,Tongtong Huang,Liang Wu,Pu Yu,Jing Zhu,Yuanhua Lin,Jing Ma,Ce‐Wen Nan,Allan J. Jacobson,Chonglin Chen
摘要
Different layered perovskite-related oxides are known to exhibit important electronic, magnetic, and electrochemical properties including metal-insulator transition, colossal magnetoresistance, excellent mixed ionic/electronic conductivity, and especially their flexible tunability by external or internal stimuli. Here, we show that the microstructure and magnetic properties of double perovskite PrBaMn2O5.5+δ (PBMO) epitaxial films can be co-tuned by the physical strain via a proper choice of substrate and film thickness and the chemical strain from the concentration of oxygen vacancies. It is surprisingly found that the films with more oxygen vacancies reveal more Mn4+ formed along with Mn2+ under the influence of interface strain, and meanwhile, Mn4+ exhibits a thickness-dependent distribution with a high amount at the interface. Consequently, the increased proportion of Mn4+ diminishes the saturation magnetization and decreases the Curie temperature of PrBaMn2O5.5+δ epitaxial films, revealing the availability of physical and chemical strains tuning the properties of highly epitaxial double perovskite films.
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