Abstract
Magnetic and electrical properties of Ln 0.5Ba 0.5CoO 3− δ with Ln=Dy and Er have been investigated to examine the effects of large cation size-disorder. While the Dy compound shows the small magnetic anomaly around 290 K just as the Gd derivative, the Er compound is essentially paramagnetic due to the large cation size-disorder. Compositions with the same average A-site cation radii as Dy 0.5Ba 0.5CoO 2.91 and Er 0.5Ba 0.5CoO 2.9, but with smaller size-disorder, show progressive evolution of ferromagnetism and metallic properties with decreasing disorder.
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