Manipulation of the Ferromagnetism in LaCoO3 Thin Films Through Cation-Stoichiometric Engineering

被引:3
|
作者
Huang, Tongtong [1 ,2 ]
Lyu, Yingjie [1 ,2 ]
Huyan, Huaixun [3 ]
Ni, Jinyang [4 ,5 ]
Saremi, Sahar [6 ,7 ]
Wang, Yujia [1 ,2 ]
Yan, Xingxu [3 ]
Yi, Di [8 ]
He, Qing [9 ]
Martin, Lane W. [6 ,7 ]
Xiang, Hongjun [4 ,5 ]
Pan, Xiaoqing [3 ,10 ,11 ]
Yu, Pu [1 ,2 ]
机构
[1] Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
[3] Univ Calif Irvine, Dept Chem Engn & Mat Sci, Irvine, CA 92697 USA
[4] Fudan Univ, Minist Educ, Key Lab Computat Phys Sci, State Key Lab Surface Phys, Shanghai 200433, Peoples R China
[5] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
[6] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA
[7] Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA
[8] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[9] Univ Durham, Dept Phys, Durham DH1 3LE, England
[10] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[11] Univ Calif Irvine, Irvine Mat Res Inst IMRI, Irvine, CA 92697 USA
基金
美国国家科学基金会;
关键词
cation off-stoichiometry; ferromagnetism; lanthanum cobaltate; oxygen vacancies; spin states; stain engineering;
D O I
10.1002/aelm.202201245
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Spin-state transitions are an important research topic in complex oxides with the diverse magnetic states involved. In particular, the low-spin to high-spin transition in LaCoO3 thin films has drawn a wide range of attention due to the emergent ferromagnetic state. Although various mechanisms (e.g., structural distortion, oxygen-vacancy formation, spin-state ordering) have been proposed, an understanding of what really underlies the emergent ferromagnetism remains elusive. Here, the ferromagnetism in LaCoO3 thin films is systematically modulated by varying the oxygen pressure during thin-film growth. Although the samples show dramatic different magnetization, their cobalt valence state and perovskite crystalline structure remain almost unchanged, ruling out the scenarios of both oxygen-vacancy and spin-ordering. This work provides compelling evidence that the tetragonal distortion due to the tensile strain significantly modifies the orbital occupancy, leading to a low-spin to high-spin transition with emergent ferromagnetism, while samples grown at reduced pressure demonstrate a pronounced lattice expansion due to cation-off-stoichiometry, which suppresses the tetragonal distortion and the consequent magnetization. This result not only provides important insight for the understanding of exotic ferromagnetism in LaCoO3 thin films, but also identifies a promising strategy to design electronic states in complex oxides through cation-stoichiometry engineering.
引用
收藏
页数:7
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