Over the last few years,researches in iridates have developed into an exciting field with the discovery of numerous emergent phenomena,interesting physics,and intriguing functionalities.Among the studies,iridate-based...Over the last few years,researches in iridates have developed into an exciting field with the discovery of numerous emergent phenomena,interesting physics,and intriguing functionalities.Among the studies,iridate-based artificial structures play a crucial role owing to their extreme flexibility and tunability in lattice symmetry,chemical composition,and crystal dimensionality.In this article,we present an overview of the recent progress regarding iridate-based artificial structures.We first explicitly introduce several essential concepts in iridates.Then,we illustrate important findings on representative SrIrO_(3)/SrTiO_(3) superlattices,heterostructures comprised of SrIrO3 and magnetic oxides,and their response to external electric-field stimuli.Finally,we comment on existing problems and promising future directions in this exciting field.展开更多
采用磁控溅射法在硅基片上制备了Co原子分数为13.0%的Co-C纳米复合薄膜.在真空条件下,对薄膜进行退火处理,退火温度从473K逐步提高至773K,保温时间30min.形貌观察表明,未经退火处理的薄膜中,Co颗粒均匀分布在非晶C基体中,Co颗粒尺寸为1....采用磁控溅射法在硅基片上制备了Co原子分数为13.0%的Co-C纳米复合薄膜.在真空条件下,对薄膜进行退火处理,退火温度从473K逐步提高至773K,保温时间30min.形貌观察表明,未经退火处理的薄膜中,Co颗粒均匀分布在非晶C基体中,Co颗粒尺寸为1.5-3.0nm;673K退火后,Co颗粒尺寸增大.磁性能测试表明,未经退火处理的薄膜磁性较弱,随着退火温度升高,薄膜的磁化强度和矫顽力均明显增大;当退火温度增加至673—773K时,薄膜呈现出低温铁磁性、室温超顺磁性的典型颗粒体系磁性特征.磁输运特性研究表明,未经退火处理的薄膜在温度为4.2K,磁场为3980kA/m时表现出1.33%的负磁电阻,随着退火温度升高,样品磁电阻值下降;电阻与温度关系在4.2—60K范围内符合lnR-T^(-1/4)线性关系,磁输运遵循变程跳跃(variable range hopping)传导机制.展开更多
基金support from the National Natural Science Foundation of China(NSFC)under grant No.51872155 and 52025024the Beijing Nature Science Foundation(Z200007)+4 种基金the Ministry of Science and Technology of China(2021YFE0107900 and 2021YFA1400300)support from the High Magnetic Field Laboratory of Anhui Province(AHHM-FX-2021-03)the NSFC under Grant No.12104460support from the NSFC under Grant No.92163113 and No.52250418support from the National Science Foundation under Grant No.DMR1848269.
文摘Over the last few years,researches in iridates have developed into an exciting field with the discovery of numerous emergent phenomena,interesting physics,and intriguing functionalities.Among the studies,iridate-based artificial structures play a crucial role owing to their extreme flexibility and tunability in lattice symmetry,chemical composition,and crystal dimensionality.In this article,we present an overview of the recent progress regarding iridate-based artificial structures.We first explicitly introduce several essential concepts in iridates.Then,we illustrate important findings on representative SrIrO_(3)/SrTiO_(3) superlattices,heterostructures comprised of SrIrO3 and magnetic oxides,and their response to external electric-field stimuli.Finally,we comment on existing problems and promising future directions in this exciting field.
文摘采用磁控溅射法在硅基片上制备了Co原子分数为13.0%的Co-C纳米复合薄膜.在真空条件下,对薄膜进行退火处理,退火温度从473K逐步提高至773K,保温时间30min.形貌观察表明,未经退火处理的薄膜中,Co颗粒均匀分布在非晶C基体中,Co颗粒尺寸为1.5-3.0nm;673K退火后,Co颗粒尺寸增大.磁性能测试表明,未经退火处理的薄膜磁性较弱,随着退火温度升高,薄膜的磁化强度和矫顽力均明显增大;当退火温度增加至673—773K时,薄膜呈现出低温铁磁性、室温超顺磁性的典型颗粒体系磁性特征.磁输运特性研究表明,未经退火处理的薄膜在温度为4.2K,磁场为3980kA/m时表现出1.33%的负磁电阻,随着退火温度升高,样品磁电阻值下降;电阻与温度关系在4.2—60K范围内符合lnR-T^(-1/4)线性关系,磁输运遵循变程跳跃(variable range hopping)传导机制.
