Abstract
La1 − x Sr x CoO3 serves as a prototype for studying crossover characteristics from static to dynamic lattice effects associated with Jahn–Teller (JT) excitations. With the use of the pair density function analysis as a function of carrier density, evidence for localized lattice distortions associated with a JT active mode is provided. Energy resolved measurements of the dynamic structure factor show that the lattice dynamics change with doping, concomitant to the local distortions that are correlated to the magnetic and transport transitions of this system. The activation of these effects might be in response to a dynamic JT mode that is invoked by fluctuations to the intermediate-spin configuration. It is suggested that such intermediate-spin clusters might be present in the metallic state of these oxides.
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