Interplay of doping and structural modulation in superconducting Bi2Sr2-xLaxCuO6+δ thin films -: art. no. 174503

被引:10
作者
Li, ZZ
Raffy, H
Bals, S
van Tendeloo, G
Megtert, S
机构
[1] Univ Paris 11, CNRS, UMR 8502, Phys Solides Lab, F-91405 Orsay, France
[2] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium
[3] Univ Paris 11, LURE, F-91898 Orsay, France
关键词
D O I
10.1103/PhysRevB.71.174503
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have studied the evolution of the structural modulation in epitaxial, c-axis-oriented, Bi2Sr2-xLaCuO6+delta thin films when varying the La content x and for a given x as a function of oxygen content. A series of thin films with 0 <= x <= 0.8 has been prepared in situ by rf-magnetron sputtering and characterized by R(T) measurements, Rutherford backscattering spectroscopy, transmission electron microscopy, and x-ray diffraction techniques. The oxygen content of each individual film was varied by thermal annealing across the phase diagram. The evolution of the structural modulation has been thoroughly studied by x-ray diffraction in determining the variation of the amplitude of satellite reflections in special two axes 2 theta/theta-theta scans (reciprocal space scans). It is shown that the amplitude of the modulation along the c axis decreases strongly when x increases from 0 to 0.2. It is demonstrated that this variation is essentially governed by La content x and that changing the oxygen content by thermal treatments has a much lower influence, even becoming negligible for x > 0.2. Such study is important to understand the electronical properties of Bi2Sr2-xLaxCuO6+gamma thin films.
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页数:7
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