Abstract
The anisotropic stress effects on superconducting temperature T c have been investigated in single crystals of La 2- x Sr x CuO 4 with x =0.10 and 0.145. Utilizing non-hydrostaticity of the applied pressure, we estimated T c in the tetragonal phase at the ambient pressure. The T c was found to be higher in the tetragonal phase than the T c in the orthorhombic phase. We demonstrate that the orthorhombic distortion suppresses superconductivity and the tetragonal structure with the flat CuO 2 plane is favorable for superconductivity.
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