Telegraph Noise in LSMO Nanowires*

Hole-doped manganites with the perovskite structure exhibit a variety of superlative properties because of close competition among ferromagnetic metallic, paramagnetic insulating, as well as various charge, spin, and orbitally ordered phases. We have recently observed random telegraph noise (RTN) in low-temperature conductance measurements of epitaxially-grown La$_{2/3}$Sr$_{1/3}$MnO$_3$ nanowires patterned by electron-beam lithography and ion milling to widths of $\sim$ 80nm. The RTN is apparent at temperatures less than 30K. It is thought that the RTN is the result of domain fluctuations, which are more clearly observable in such narrow wires.