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.

引用

页数：5

共 22 条

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