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A comparative study for two different series, La0.67Ca0.33Mn1−xCrxO3 and La0.67+xCa0.33−xMn1−xCrxO3, is performed with χ changing from 0.04 to 0.08 through measurements of zero-field resistivity (π), magnetoresistance (MR) and ac susceptibility (χ) as functions of temperature (T). For the second group, a single insulator-metal transition was characterized by the resistivity maximum appears...
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