Magnetism, resistivity and magnetoresistance in Ca1−xYxMnO3

We present magnetic and transport studies on the manganite Ca 1-x Y x MnO 3 (x ≤ 0.25). A small Y concentration produces an important decrease in the electrical resistivity and increases the magnetization but full ferromagnetic order is not achieved. The samples with 0.05 ≤ x < 0.18 show magnetoresistive effects. For x ≥ 0.18 indications of charge order were observed in the magnetization and resistivity behaviors.