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Electronic correlation effects in La2−xSrxNiO4 (x=1/3 and 0.225) lead to spontaneous phase separation into microscopic spin/charge stripes with commensurate and incommensurate order, respectively. Raman scattering experiments on such single-crystalline materials show a rich phenomenology of phonon and magnon anomalies due to the new, self-organized periodicities. These effects are observable as function of temperature but can also be induced by cooling in seemingly small magnetic fields leading to a reorganization of stripe structure.

Phonons and magnons in stripe-ordered nickelates. A Raman scattering study