| Low frequency noise and non-linear transport in charge-ordered manganites (2001) | |||||||||
Abstract | |||||||||
| Rare-earth manganites are known to show charge-ordering (CO). The CO state is unstable towards a number of external perturbations including an electric current and shows non linear conductivity. We have investigated the low frequency noise (f < 20 Hz) in a CO material - a single crystal of $Pr_{0.63}Ca_{0.37}MnO_3$ when the CO state is destabilized with a electric current. We find that the appearance of non linear transport (as seen by non-linear I-V curve) is accompanied by a large low frequency noise. The noise has, in addition to a 1/f nature, distinct low frequency components which change with applied current. Our experiments imply existence of a threshold current that would destabilize the CO state leading to non-linear conductivity | |||||||||
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