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首页> 外文期刊>Physica, C. Superconductivity and its applications >Microstructures of Tl2Ba2CuO6 thin films with different doping levels
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Microstructures of Tl2Ba2CuO6 thin films with different doping levels

机译：不同掺杂水平的Tl2Ba2CuO6薄膜的微观结构

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Microstructures of Tl2Ba2CuO6 (Tl-2201) thin films with different doping levels grown on SrTiO3 substrates were studied by transmission electron microscopy, It is found that Tl-2201 films are epitaxial single phase over large area. A new three-dimensional modulation structure was observed for the heavily overdoped films. With decrease of doping level from heavily overdoped to optimally doped, the modulation structure becomes weaker and weaker and finally disappears at T-c of about 50 K. The structural symmetry of the optimally doped Tl-2201 films was confirmed to be tetragonal I4/mmm by convergent-beam electron diffraction. The tetragonal symmetry is broken into orthorhombic due to the modulation structure and consequently orthogonal twinning bands along [110] directions were observed. The modulation was found to be mainly localized in the CuO2 plane. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 26]
机译：利用透射电子显微镜研究了在SrTiO3衬底上生长的不同掺杂水平的Tl2Ba2CuO6（Tl-2201）薄膜的微观结构，发现Tl-2201薄膜为大面积外延单相。观察到重掺杂薄膜的新的三维调制结构。随着掺杂水平从重掺杂到最佳掺杂的降低，调制结构变得越来越弱，并最终在约50 K的Tc消失。通过收敛，最佳掺杂Tl-2201薄膜的结构对称性被确认为四方晶I4 / mmm。束电子衍射。由于调制结构，四边形对称被分解为正交晶，因此观察到沿[110]方向的正交孪生带。发现该调制主要位于CuO 2平面中。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：26]

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