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- W1968776998 abstract "The perovskite cobaltite Pr0.5Ca0.5CoO3 has been characterized by the magnetic and electric transport measurements, and structurally studied by neutron diffraction. The sample is a metallic-like conductor in a broad temperature range. On cooling, it undergoes at 75 K an incomplete transition to the ferromagnetic phase of enhanced metallic character. The residual paramagnetic regions exhibit at about 30 K a metal–insulator (M–I) transition, which is interpreted as a change from the t2g5σ*0.5 cobalt states with collective eg electrons to a mixture of localized Co3+(t2g6) and Co4+(t2g5) low-spin states. The new insulating phase is of the same orthoperovskite type but distinguished by about 2% smaller unit cell volume compared to the ferromagnetic phase. The lattice contraction is caused by significant shortening of Pr,Ca–O bonding distances while the Co–O bond lengths remain nearly constant." @default.
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- W1968776998 date "2007-09-01" @default.
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- W1968776998 title "The low-temperature phase separation in Pr0.5Ca0.5CoO3" @default.
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- W1968776998 doi "https://doi.org/10.1016/j.jmmm.2007.03.078" @default.
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