Telegraph Noise in LSMO Nanowires

Lanthanum strontium manganites (La$_{1-x}$Sr$_{x}$MnO$_{3}$) are oxide materials that exhibit colossal magnetoresistance and have potential in spintronics applications. Their resistivity is affected by the competition between a double exchange mechanism and a Jahn-Teller distortion. We present magnetic-field dependent transport measurements on PLD-grown La$_{2/3}$Sr$_{1/3}$MnO$_{3}$ nanowires. First, we show signatures of bimodal random telegraph noise that occur at temperatures below 100 K. We also discuss the temperature dependence of the resistance, which is consistent with a meta-stability in the nanowire. Both behaviors can be explained by a competition between ferromagnetic metallic and charge-ordered insulating domains, caused by double exchange and the Jahn-Teller distortion, respectively.