Atomic and electronic structures of superconducting BaFe2As2/SrTiO3 superlattices

被引：5
|
作者：
Gao, P. [1 ]
Zhang, Y. [1 ,2 ,3 ]
Zhang, S. Y. [1 ,2 ,3 ]
Lee, S. [4 ]
Weiss, J. [5 ]
Jokisaari, J. R. [1 ]
Hellstrom, E. E. [5 ]
Larbalestier, D. C. [5 ]
Eom, C. B. [4 ]
Pan, X. Q. [1 ]
机构：
[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
[2] Nanjing Univ, Nat Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[3] Nanjing Univ, Dept Mat Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China
[4] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA
[5] Florida State Univ, Natl High Magnet Field Lab, Ctr Appl Supercond, Tallahassee, FL 32310 USA
来源：
PHYSICAL REVIEW B | 2015年 / 91卷 / 10期
基金：
美国国家科学基金会;
关键词：
THIN-FILMS; MODULATION;
D O I：
10.1103/PhysRevB.91.104525
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The nanoscale structural, chemical, and electronic properties of artificial engineered superlattice thin films consisting of superconducting Co-doped BaFe2As2 (Ba-122) and nonsuperconducting SrTiO3 (STO) layers are determined by using atomically resolved scanning transmission electron microscopy and electron energy loss spectroscopy. The bonding of Ba-122/STO occurring between As (Ba) and SrO (TiO2) terminated layers has been identified. The thin STO (3 unit cell) insertion layers are a mixture of cations (Ba, Sr, Fe, and Ti) and rich in oxygen vacancies and the Ba-122 layers (10 unit cell) are free of vertical second phases. Our results explain why these superlattices show anisotropic transport response to an external magnetic field, i.e., strong ab-axis pinning (enhancing critical current density) and no c-axis pinning, which is opposite to single layer Ba-122 thin films. These findings reveal physical and chemical properties of superconducting/nonsuperconducting heterostructures and provide important insights into engineering of superconducting devices.
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页数：5
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