Resistivity and 1/f Noise in Non-Metallic Phase Separated Manganites

Abstract

A simple model is proposed to calculate resistivity, magnetoresistance, and noise spectrum in non-metallic phase-separated manganites containing small metallic droplets (magnetic polarons). The system is taken to be far from the percolation transition into a metallic state. It is assumed that the charge transfer occurs due to electron tunneling from one droplet to another through the insulating medium. As a result of this tunneling, the droplets acquire or lose extra electrons forming metastable two-electron and empty states. In the framework of this model, explicit expressions for dc conductivity and noise power of the system are derived. It is shown that the noise spectrum has 1/f form in the low-frequency range.

6 pages, 1 fugure included

References in corpus (2)

• Shot Noise in Mesoscopic Conductors
• Giant 1/f noise in perovskite manganites: evidence of the percolation threshold

Cited by in corpus (7)

• Electronic phase separation: recent progress in the old problem
• Nanoscale phase separation in manganites
• Anomalous resistivity and the origin of a heavy mass in the two-band Hubbard model with one narrow band
• Jahn-Teller distortions and phase separation in doped manganites
• Anomalous resistivity and the electron-polaron effect in the two-band Hubbard model with one narrow band
• Noise studies of magnetization dynamics in dilute magnetic semiconductor heterostructures
• Tuning the Correlation Decay in the Resistance Fluctuations of Multi-Species Networks