Strain Effect of a-Axis-Oriented Sr1-xLaxCuO2 Thin Films Grown on LaAlO3 Substrates

Yilun He, Masataka Ito*, Tetsuya Hajiri, Kenji Ueda, Hidefumi Asano

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The epitaxial thin films of electron-doped infinite-layer cuprate superconductor Sr1-xLaxCuO2 (SLCO; x = 0.1 ) were grown by dc magnetron sputtering, and their structural and electrical properties were systematically investigated by changing mismatch to substrate and SLCO film thickness, with a reduction annealing period under vacuum to remove the excess apex oxygen. Thin films of BaySr1-yTiO3 (BSTO) with y = 0.55 , 0.6, and 0.7, prepared on (001) (La0.18Sr0.82)(Al0.59Ta0.41)O3 substrates, were used as the epitaxial buffer layers to induce different levels of tensile strain in c -axis-oriented SLCO, while (001) LaAlO3 substrates were used for the growth of a-axis-oriented SLCO. The highest Tc value of c-axis oriented SLCO was obtained on the BSTO (y = 0.6) layers and the mismatch dependence of strain relaxation thickness was clarified. The strain in a-axis SLCO films was analyzed and controlled by changing the thickness of SLCO thin films. As a result, strong thickness dependence of superconducting properties was observed, and Tc zero was obtained in the a-axis SLCO for the first time. Based on these results, the strain effects of the SLCO film properties are discussed.

Original languageEnglish
Article number7137675
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - 2015 Nov 1
Externally publishedYes


  • Infinite-layer (IL) compound
  • strain effect
  • superconducting thin films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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