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Controllable oxygen vacancies, orbital occupancy and magnetic ordering in SrCoO3-delta films
Gu, YD; Song, C; Zhang, HR; Wang, ZC; Cui, B; Li, F; Peng, JJ; Saleem, MS; Wang, GY; Zhong, XY; Wang, F; Ma, S; Sun, JR; Liu, W; Pan, F; Zhang, ZD; Liu, W (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
2018-05-15
发表期刊JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN0304-8853
卷号454页码:228-236
摘要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 SrCoO3-delta 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 -1.0% in SrCoO3-delta films, associated with 3 - delta varying from similar to 2.90 to similar to 2.835, then to similar to 2.72. 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+ (t(2g)(4) e(g)(1))/high spin-Co3+ (t(2g)(4) e(g)(2)) in different proportions depending on strain states. Such controllable spin and orbital configurations lead to more robust magnetization in tensile strained SrCoO3-delta 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. (C) 2018 Elsevier B.V. All rights reserved.; 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 SrCoO3-delta 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 -1.0% in SrCoO3-delta films, associated with 3 - delta varying from similar to 2.90 to similar to 2.835, then to similar to 2.72. 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+ (t(2g)(4) e(g)(1))/high spin-Co3+ (t(2g)(4) e(g)(2)) in different proportions depending on strain states. Such controllable spin and orbital configurations lead to more robust magnetization in tensile strained SrCoO3-delta 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. (C) 2018 Elsevier B.V. All rights reserved.
部门归属[gu, youdi ; wang, fei ; ma, song ; liu, wei ; zhang, zhidong] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china ; [gu, youdi ; song, cheng ; cui, bin ; li, fan ; peng, jingjing ; saleem, muhammad shahrukh ; wang, guangyue ; pan, feng] tsinghua univ, sch mat sci & engn, key lab adv mat moe, beijing 100084, peoples r china ; [zhang, hongrui ; sun, jirong] chinese acad sci, inst phys, beijing natl lab condensed matter, beijing 100190, peoples r china ; [wang, zechao ; zhong, xiaoyan] tsinghua univ, sch mat sci & engn, natl ctr electron microscopy beijing, beijing 100084, peoples r china ; [gu, youdi ; liu, wei ; zhang, zhidong] univ chinese acad sci, beijing 100049, peoples r china
关键词Transition-metal Oxides Phase-transformation Redox Reactions Ground-state Nanoscale Srcoo2.5 Defects Physics
学科领域Materials Science, Multidisciplinary ; Physics, Condensed Matter
资助者National Natural Science Foundation of China [51671110, 51571128, 51590883, 51771198]; National Key Research and Development Program [2016YFA0203800, 2016YFA0300701]
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/79309
专题中国科学院金属研究所
通讯作者Liu, W (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式
GB/T 7714
Gu, YD,Song, C,Zhang, HR,et al. Controllable oxygen vacancies, orbital occupancy and magnetic ordering in SrCoO3-delta films[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,2018,454:228-236.
APA Gu, YD.,Song, C.,Zhang, HR.,Wang, ZC.,Cui, B.,...&Liu, W .(2018).Controllable oxygen vacancies, orbital occupancy and magnetic ordering in SrCoO3-delta films.JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,454,228-236.
MLA Gu, YD,et al."Controllable oxygen vacancies, orbital occupancy and magnetic ordering in SrCoO3-delta films".JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 454(2018):228-236.
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