Preparation and Properties of Sr0.9La0.1CuO2 Thin Films Grown on BaySr1-yTiO3 Layers

Yilun He; Masataka Ito; Keita Sakuma; Kenji Ueda; Hidefumi Asano

doi:10.1109/TASC.2014.2380824

Preparation and Properties of Sr_0.9La_0.1CuO₂ Thin Films Grown on Ba_ySr_1-yTiO₃ Layers

Yilun He, Masataka Ito, Keita Sakuma, Kenji Ueda, Hidefumi Asano

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Epitaxial thin films of electron-doped infinite-layer (IL) cuprate superconductor Sr_1-xLa_xCuO ₂ (SLCO, x = 0.1) were grown by dc magnetron sputtering, and their structural and electrical properties were investigated systematically by changing the reduction annealing period under vacuum to remove excess apical-oxygen and the SLCO film thickness. Thin films of Ba_ySr_1-yTiO₃ with y = 0.4, 0.55, and 0.7, prepared on (001) (La_0.18Sr_0.82)(Al_0.59Ta_0.41)O₃ (LSAT) substrates, were used as epitaxial buffer layers to induce different types of strain in SLCO. For the tensile strained SLCO films on Ba_0.55Sr_0.45TiO₃ and on Ba_0.7Sr_0.3TiO₃ layers, short time (several minutes) reduction annealing was found to be effective for the removal of excess apical-oxygen and the appearance of superconductivity, whereas the reduction annealing was less effective for the compressively strained SLCO films on Ba _0.4Sr_0.6TiO₃ layers. Moreover, strong thickness dependences of superconducting properties have been observed for tensile strained SLCO films on Ba_0.55Sr_0.45TiO₃ and on Ba_0.7Sr_0.3TiO₃ layers. Based on these results, the strain and reduction effects of the SLCO film properties are discussed.

Original language	English
Article number	6985575
Journal	IEEE Transactions on Applied Superconductivity
Volume	25
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2014.2380824
Publication status	Published - 2015 Jun 1
Externally published	Yes

Keywords

Infinite-layer compound
strain effect
superconducting thin films

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1109/TASC.2014.2380824

Cite this

@article{f12bf1cf6b8849d5a56b9fe3c0f26cbe,

title = "Preparation and Properties of Sr0.9La0.1CuO2 Thin Films Grown on BaySr1-yTiO3 Layers",

abstract = "Epitaxial thin films of electron-doped infinite-layer (IL) cuprate superconductor Sr1-xLaxCuO 2 (SLCO, x = 0.1) were grown by dc magnetron sputtering, and their structural and electrical properties were investigated systematically by changing the reduction annealing period under vacuum to remove excess apical-oxygen and the SLCO film thickness. Thin films of BaySr1-yTiO3 with y = 0.4, 0.55, and 0.7, prepared on (001) (La0.18Sr0.82)(Al0.59Ta0.41)O3 (LSAT) substrates, were used as epitaxial buffer layers to induce different types of strain in SLCO. For the tensile strained SLCO films on Ba0.55Sr0.45TiO3 and on Ba0.7Sr0.3TiO3 layers, short time (several minutes) reduction annealing was found to be effective for the removal of excess apical-oxygen and the appearance of superconductivity, whereas the reduction annealing was less effective for the compressively strained SLCO films on Ba 0.4Sr0.6TiO3 layers. Moreover, strong thickness dependences of superconducting properties have been observed for tensile strained SLCO films on Ba0.55Sr0.45TiO3 and on Ba0.7Sr0.3TiO3 layers. Based on these results, the strain and reduction effects of the SLCO film properties are discussed.",

keywords = "Infinite-layer compound, strain effect, superconducting thin films",

author = "Yilun He and Masataka Ito and Keita Sakuma and Kenji Ueda and Hidefumi Asano",

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T1 - Preparation and Properties of Sr0.9La0.1CuO2 Thin Films Grown on BaySr1-yTiO3 Layers

AU - He, Yilun

AU - Ito, Masataka

AU - Sakuma, Keita

AU - Ueda, Kenji

AU - Asano, Hidefumi

PY - 2015/6/1

Y1 - 2015/6/1

N2 - Epitaxial thin films of electron-doped infinite-layer (IL) cuprate superconductor Sr1-xLaxCuO 2 (SLCO, x = 0.1) were grown by dc magnetron sputtering, and their structural and electrical properties were investigated systematically by changing the reduction annealing period under vacuum to remove excess apical-oxygen and the SLCO film thickness. Thin films of BaySr1-yTiO3 with y = 0.4, 0.55, and 0.7, prepared on (001) (La0.18Sr0.82)(Al0.59Ta0.41)O3 (LSAT) substrates, were used as epitaxial buffer layers to induce different types of strain in SLCO. For the tensile strained SLCO films on Ba0.55Sr0.45TiO3 and on Ba0.7Sr0.3TiO3 layers, short time (several minutes) reduction annealing was found to be effective for the removal of excess apical-oxygen and the appearance of superconductivity, whereas the reduction annealing was less effective for the compressively strained SLCO films on Ba 0.4Sr0.6TiO3 layers. Moreover, strong thickness dependences of superconducting properties have been observed for tensile strained SLCO films on Ba0.55Sr0.45TiO3 and on Ba0.7Sr0.3TiO3 layers. Based on these results, the strain and reduction effects of the SLCO film properties are discussed.

AB - Epitaxial thin films of electron-doped infinite-layer (IL) cuprate superconductor Sr1-xLaxCuO 2 (SLCO, x = 0.1) were grown by dc magnetron sputtering, and their structural and electrical properties were investigated systematically by changing the reduction annealing period under vacuum to remove excess apical-oxygen and the SLCO film thickness. Thin films of BaySr1-yTiO3 with y = 0.4, 0.55, and 0.7, prepared on (001) (La0.18Sr0.82)(Al0.59Ta0.41)O3 (LSAT) substrates, were used as epitaxial buffer layers to induce different types of strain in SLCO. For the tensile strained SLCO films on Ba0.55Sr0.45TiO3 and on Ba0.7Sr0.3TiO3 layers, short time (several minutes) reduction annealing was found to be effective for the removal of excess apical-oxygen and the appearance of superconductivity, whereas the reduction annealing was less effective for the compressively strained SLCO films on Ba 0.4Sr0.6TiO3 layers. Moreover, strong thickness dependences of superconducting properties have been observed for tensile strained SLCO films on Ba0.55Sr0.45TiO3 and on Ba0.7Sr0.3TiO3 layers. Based on these results, the strain and reduction effects of the SLCO film properties are discussed.

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KW - strain effect

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