Structural and transport properties of epitaxial Ba(Fe1-xCox)2As2 thin films on various substrates

被引：14

作者：

Lei, Q. Y. ^{[1
]}

Golalikhani, M. ^{[1
]}

Yang, D. Y. ^{[1
]}

Withanage, W. K. ^{[1
]}

Rafti, A. ^{[1
]}

Qiu, J. ^{[1
]}

Hambe, M. ^{[1
]}

Bauer, E. D. ^{[2
]}

Ronning, F. ^{[2
]}

Jia, Q. X. ^{[2
]}

Weiss, J. D. ^{[3
]}

Hellstrom, E. E. ^{[3
]}

Wang, X. F. ^{[4
,5
]}

Chen, X. H. ^{[4
,5
]}

Williams, F. ^{[6
]}

Yang, Q. ^{[6
]}

Temple, D. ^{[6
]}

Xi, X. X. ^{[1
]}

机构：

[1] Temple Univ, Dept Phys, Philadelphia, PA 19122 USA

[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[3] Florida State Univ, Natl High Magnet Field Lab, Ctr Appl Superconduct, Tallahassee, FL 32310 USA

[4] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[5] Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China

[6] Norfolk State Univ, Ctr Mat Res, Appl Res Ctr, Norfolk, VA 23504 USA

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2014年 / 27卷 / 11期

基金：

美国国家科学基金会;

关键词：

superconductor; thin films; microstructure; SUPERCONDUCTIVITY; BAFE2AS2;

D O I：

10.1088/0953-2048/27/11/115010

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A comprehensive microstructural study was conducted on optimally-doped epitaxial Ba(Fe1-xCox)(2)As-2 thin films grown by pulsed laser deposition on various substrates of a wide range of lattice constants: SrTiO3, LaAlO3, (La, Sr)(Al, Ta)O-3, MgO, CaF2, and BaF2. We found that epitaxial strain directly affects the superconductivity in the film, with the transition temperature decreasing linearly with increasing in-plane lattice constant of the film. However, the strain is not determined by the lattice mismatch between the film and substrate. Instead, the mosaic spread of the grain orientation in the film and the thermal expansion coefficient of the substrate were found to correlate well with the in-plane lattice constant of the film. The result confirms the importance of structural distortions to the superconductivity in the Ba(Fe1-xCox)(2)As-2 films.

引用

页数：9

共 25 条

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