Magnetoimpedance effect in semiconducting La0.4Sr0.6MnO3

In the present work, it was found that for La0.4Sr0.6MnO3, the dc resistance decreases with increasing temperature, from 77 to 280 K. Different from the case of metallic La0.65Sr0.35MnO3, the ac impedance of the semiconducting La0.4Sr0.6MnO3 at room temperature decreases with increasing frequency, from 100 kHz to 12 MHz. The magnetoimpedance effect was observed in La0.4Sr0.6MnO3 at room temperature. The value of impedance ratio (Z(0)−Z(H))/Z(0) at H=0.8 kOe reaches 5% at a frequency of 500 kHz.