This article is cited in 12 papers

$N$-shaped voltage-current characteristic and current oscillations in Sm$_{1-x}$ Sr$_x$MnO$_3$ manganite

I. K. Kamilov, K. M. Aliev, Kh. O. Ibragimov, N. S. Abakarova

Institute of Physics, Daghestan Scientific Centre, Russian Academy of Sciences

Abstract: The voltage-current characteristics (VCC) of Sm$_{1-x}$Sr$_x$MnO$_3$ samples with $x=0.425$ and $x=0.450$ were experimentally studied at a temperature of 77 K in pulsed and constant electric ($E$) and magnetic ($H$) fields up to 10 kOe for the $H\parallel E$ and $H\perp E$ orientations. $N$-shaped VCCs and high-frequency (up to 3 MHz) current oscillations were observed. It was found that the effect of colossal magnetoresistance had a threshold character and was smoothly reduced to zero with $E\to 0$.

PACS: 72.20.Ht, 72.80.Ga, 75.30.Vn

Received: 08.09.2003

 English version: Journal of Experimental and Theoretical Physics Letters, 2003, 78:8, 485–487

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