Abstract
In the phase diagram of La 1− x Sr x MnO 3 the compound with x=0.125, exhibits below T C=181 K, a ferromagnetic and metallic phase (FM). At T O′O″=159 K, a magneto-structural transition occurs towards a ferromagnetic and insulating (FI) phase with amazing properties. New superstructure Bragg peaks appear. At q =(000.5), the spin wave energies split into two levels and, along [0 0 1], they lock successively on the values of phonon modes. This suggests a complex ground state for this (FI) phase with mixed magnetic and phononic excitations. These results are discussed in the frame of existing theories.
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