La-214 thin films under epitaxial strain

H. Sato*, A. Tsukada, M. Naito, A. Matsuda

*この研究の対応する著者

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Compressive (or expansive) epitaxial strain was induced in (001)-oriented La-214 thin films. For the compressed films of La2-xSrxCuO4+δ and La2-xBaxCuO4+δ on LaSrAlO4 substrates, the superconducting transition temperature (Tc.) reached 44 K and 47 K, respectively, with δ∼ 0. When both films had δ > 0, Tc reached 49 K. These values are higher than those for bulk samples. The Tc-x phase diagrams for the films did not show a local minimum at x ∼ 0.125, the so-called "1/8 anomaly". The compressive strain expands the c-axis via the Poisson effect and suppresses formation of the low-temperature tetragonal phase. Both effects result in an increase in the bond length between Cu and the apical oxygen (Oapex), which is responsible for the enhancement of Tc. Furthermore, based on the experimental fact that the lower residual resistivity gives a higher Tc, we speculate that the Tc enhancement is caused by the reduced antiferromagnetic spin fluctuation in the CuO2 planes due to the change in the Cu-Oapex bond length.

本文言語English
ページ(範囲)1767-1770
ページ数4
ジャーナルPhysica C: Superconductivity and its applications
341-348
PART 2
DOI
出版ステータスPublished - 2000
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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