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Magnetic superlattice peaks are observed in single-crystal neutron-diffraction measurements on orthorhombic La 1.88 Sr 0.12 CuO 4 at reciprocal points of ͑1/2Ϯ⑀,1/2,0͒ and ͑1/2,1/2Ϯ⑀,0͒ in the tetragonal notation where ⑀ϭ0.126Ϯ0.003. The La NMR measurement reveals a broadening of the field-swept spectrum below ϳ45 K corresponding to the existence of magnetic order. The remarkable softening of longitudinal sound waves along ͓110͔ is observed in the same crystal. The features observed in the neutron diffraction, NMR, and ultrasonic measurements suggest that the dynamical incommensurate spin correlation is pinned by a lattice instability toward the low-temperature tetragonal phase. ͓S0163-1829͑98͒50706-0͔ RAPID COMMUNICATIONS R323057 T. SUZUKI et al.

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