Abstract
Neutron inelastic scattering measurements on single crystals of La 2− x Sr x CuO 4− y have been performed to study the relation between the soft phonon and the superconductivity. The phonon softening of the Z-point mode due to the incipient structural phase transition to the low-temperature tetragonal (P4 2/ncm) or orthorhombic (Pccn) phase appeared to be frozen below T c. The narrowing of the phonon line-width upon cooling was saturated below T c, suggesting the appearance of the extra line broadening in the superconducting state.
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