Abstract
Using combinatorial molecular beam epitaxy (COMBE), we have deposited combinatorial libraries of La2−xSrxCuO4 (LSCO) single-crystal thin films with different Sr content. A study of these LSCO libraries allows for a systematic evaluation of the COMBE method. We have also developed and tested a multiple-probe set-up for transport measurements that allowed us to measure within one week the R(T) dependence in more than 2000 different samples (pixels in the 1D combinatorial library of LSCO). We also studied in detail the dependence of the crystal structure (specifically, the c-axis lattice constant) on the Sr content and on the type of epitaxial strain (compressive versus tensile). For the films grown on LaSrAlO4 substrates, we found that the c-axis lattice constant of LSCO films decreased as Sr content was increased. This we attribute to the reduction in the epitaxial strain, since the in-plane lattice constant of LSCO decreases as Sr doping is increased. We also discuss the effect of the (small) nonlinearity of beam profile.
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