Giant 1/f noise in low-Tc CMR manganites: Evidence of the percolation threshold

V. Podzorov, M. Uehara, M. E. Gershenson, T. Y. Koo, S. W. Cheong

Research output: Contribution to journalConference articlepeer-review

Abstract

We observed a dramatic peak in the 1/f noise at the metal-insulator transition (MIT) in low-Tc manganites. This many-orders-of-magnitude noise enhancement is observed for both polycrystalline and single-crystal samples of La5/8-y Pry Ca3/8MnO3 (y = 0.35 - 0.4) and Pr1-x CaxMnO3 (x = 0.35 - 0.5). This observation strongly suggests that the microscopic phase separation in the low-Tc manganites causes formation of a percolation network, and that the observed MIT is a percolation threshold. It is shown that the scale of phase separation in polycrystalline samples is much smaller than that in single crystals.

Original languageEnglish (US)
Pages (from-to)113-123
Number of pages11
JournalMaterials Research Society Symposium - Proceedings
Volume602
StatePublished - 2000
EventMagnetoresistive Oxides and Related Materials - Boston, MA, United States
Duration: Nov 29 1999Dec 2 1999

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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