Abstract
We report measurements of the magnetic and electrical properties of sintered manganites of the form 
. We find that the peak in the conductivity moves rapidly to lower temperatures as the chromium content is increased and is completely absent for x > 0.2. The Curie temperature, as determined by magnetization measurements, is much less strongly suppressed, disappearing at 
. We interpret this behaviour in terms of the very different effects of the chromium in lifting spin and orbital degeneracy.
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