کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8153569 | 1524767 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Controllable oxygen vacancies, orbital occupancy and magnetic ordering in SrCoO3âδ films
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Epitaxial strain imposed in complex oxide ultrathin films is recognized as a powerful tool for controlling the ground state of correlated electron system. Here, we achieved simultaneous control of oxygen vacancies, orbital occupancy and magnetic ordering through the facile application of epitaxial strain, both tensile and compressive, in SrCoO3âδ oxygen “sponge” material rather than the ordinary manganites. The oxygen vacancies are enhanced greatly as the strain changes from smaller tensile 1.0% to larger tensile 2.0%, then to moderate compressive â1.0% in SrCoO3âδ films, associated with 3â¯ââ¯Î´ varying from â¼2.90 to â¼2.835, then to â¼2.72. Highest saturated magnetization is found in the thin films in small tension on La0.3Sr0.7Al0.65Ta0.35O3 substrate and lower values are found in larger tension on SrTiO3 and lowest values in moderate compression on LaAlO3. Meanwhile, electrons prefer to occupy the in-plan oriented orbitals for the tensile strain, in contrast to the preferential out-of-plane orbital occupancy for the compressive state associated with coupled intermediate spin-Co4+ (t2g4eg1)/high spin-Co3+ (t2g4eg2) in different proportions depending on strain states. Such controllable spin and orbital configurations lead to more robust magnetization in tensile strained SrCoO3âδ films than in its compressive counterpart. Our findings provide a nostrum for tailoring and controlling new magnetic, electronic and ionically active properties with strain engineering and further enrich orbital physics in cobaltites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 454, 15 May 2018, Pages 228-236
Journal: Journal of Magnetism and Magnetic Materials - Volume 454, 15 May 2018, Pages 228-236
نویسندگان
Youdi Gu, Cheng Song, Hongrui Zhang, Zechao Wang, Bin Cui, Fan Li, Jingjing Peng, Muhammad Shahrukh Saleem, Guangyue Wang, Xiaoyan Zhong, Fei Wang, Song Ma, Jirong Sun, Wei Liu, Feng Pan, Zhidong Zhang,