Neutron diffraction and small-angle scattering on La 1 − x Sr x CoO 3 (0 < x ⩽ 0.30) show that for x = 0.3 the system is near a two-phase percolation threshold and undergoes a transition from itinerant to polaronic conduction at the Curie temperature T C . The stabilization of superparamagnetic clusters on warming through T C is revealed by an anomalous thermal expansion of the volume and a deviation of the paramagnetic susceptibility from the Curie-Weiss law. The development of a temperature-dependent small-angle-scattering signal confirms that regions of short-range ferromagnetic order are present above T C .
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Caciuffo et al. (1999) studied this question.
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