Abstract
We present results of a detailed investigation of the structural phase transitions and their influence on superconductivity in rare earth doped La 2−xSr xCuO 4. The structural transitions are predominantly determined by size differences of the atoms in alternating layers of the structure. In contrast to the findings in Ba-doped La 2 CuO 4 the influence of the low temperature transition on the electronic properties is not restricted to a narrow hole doping around x ⋍ 1 8 . Our data show a strong influence of the buckling of the planar (CuOCu) bonds on the electronic properties. In particular, superconductivity disappears in the low temperature tetragonal phase if the buckling exceeds a critical strength.
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