Critical Buckling for the Disappearance of Superconductivity in Rare-Earth-Doped ${\mathrm{La}}_{2-x}{\mathrm{Sr}}_x\mathrm{Cu}{\mathrm{O}}_4$

Analysis of the structural, transport, and superconducting properties of Nd-doped ${\mathrm{La}}_{2-x}{\mathrm{Sr}}_x\mathrm{Cu}{\mathrm{O}}_4$ reveals a critical tilt angle of the Cu${\mathrm{O}}_6$ octahedra for the disappearance of superconductivity in the low temperature tetragonal phase. Our results indicate a strong influence of the tilt of the Cu${\mathrm{O}}_6$ octahedra on the electronic properties, suggesting the importance of spin-orbit coupling for the destruction of superconductivity and for the stabilization of a magnetic state.