Suppression of Precipitates in the La_2-xSr_xCuO₄ Films Grown on LaSrAlO₄ Substrates by Introducing Homoepitaxial Layer

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概要

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• We have investigated impacts of a LaSrAlO₄ (LSAO) homoepitaxial layer (HL) on the quality of La_2-xSr_xCuO₄ (LSCO) films grown on single crystal LSAO (001) substrates by pulsed laser deposition. Introduction of the LSAO HL significantly suppressed the segregation of impurity phases in the LSCO films especially in a higher Sr-doping range ($x > 0.20$), leading to the improvement of the surface morphology. The suppression of impurity phases also enables us to obtain the desired stoichiometry of the LSCO films, which show the superconducting dome in the $x$-temperature phase diagram very similar to that of bulk samples.

• 2011-09-25

著者

• Okamoto Hiroshi

  Department Of Advanced Biological Sciences For Regeneration (kotobiken Medical Laboratories) Tohoku

• Okamoto Hiroshi

  Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

• Li Bing-Sheng

  Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

• Sawa Akihito

  National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562, Japan

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