Abstract
We systematically study the structural and electronic properties of very thin cuprate films. Our direct angle resolved photoemission spectroscopy (ARPES) measurements on the low binding energy electronic structure of La<sub>2-x</sub>Sr<sub>x</sub>CuO<sub>4</sub> (LSCO) films confirmed that the Fermi surface evolves with doping, but changes even more significantly with growth-induced compressive strain. For a given doping, the in-plane compressive strain enhances T<sub>C</sub>'s and modifies the 2-dimensional hole-like Fermi surface as to appear more electron-like. In contrast, the in-plane <i>tensile</i> strain reduces T<sub>C</sub> (suppressing superconductivity for huge tensile strain) and shows <i>3-dimensional</i> ARPES dispersion with a corresponding <i>3-dimensional</i> Fermi surface. To account for these striking changes in electronic structure and superconductivity, the out-of-plane states should be taken into account, as well as some subtle changes in the associated atomic distances.
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