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Low frequency electrical noise measurements have been used to probe theelectronic state of the perovskite-type manganese oxide Pr2/3Ca1/3MnO3 versustemperature and in the vicinity of the field-induced transition from theinsulating, charge-ordered state (I-CO) to the metallic, ferromagnetic state(M-F). At high temperature we have observed a high level of the excess noisewith mainly a gaussian distribution of the resistance fluctuations, and theassociated power spectral density has a standard 1/f dependence. However, inthe hysteretic region, where the electrical resistance depends dramatically onthe sample history, we have observed a huge non-gaussian noise characterized bytwo level fluctuator-like switching (TLS) in the time domain. We discuss theorigin of the noise in terms of percolative behavior of the conductivity. Wespeculate that the dominant fluctuators are manganese clusters switchingbetween the M-F and the I-CO phases.Comment: RevTeX, 6 pages with 3 figure

Electrical noise from phase separation in Pr2/3Ca1/3MnO3 single crystal