Magnetic superlattice peaks are observed in single-crystal neutron-diffraction measurements on orthorhombic La1.88Sr0.12CuO4 at reciprocal points of (1/2±∈,1/2,0) and (1/2,1/2±∈,0) in the tetragonal notation where ∈=0.126±0.003. The La NMR measurement reveals a broadening of the field-swept spectrum below ∼45 K corresponding to the existence of magnetic order. The remarkable softening of longitudinal sound waves along  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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1998 Feb 1|
ASJC Scopus subject areas
- Condensed Matter Physics