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Structural Instability Associated with the Tilting of CuO<sub><b>6</b></sub>Octahedra in La<sub><b>2</b>-<i><i>x</i></i></sub>Sr<sub><i><i>x</i></i></sub>CuO<sub><b>4</b></sub>
Comprehensive inelastic neutron-scattering measurements were performed to study the soft optical phonons in La 2- x Sr x CuO 4 at x =0.10, 0.12 and 0.18. We found at x =0.18 that the softening of Z -point phonon, suggesting incipient structural transition from the low-temperature orthorhombic (LTO) to low-temperature tetragonal …