High frequency cut-off in 1/f conductivity noise of hole-doped La1-xCaxMnO3 manganite single crystals

Jacek Przybytek, Jan Fink-Finowicki, Roman Puźniak, Grzegorz Jung

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3 Scopus citations

Abstract

High frequency bias and temperature-dependent Lorentzian cut-off has been observed in the 1/f spectra of the conductivity fluctuations in low holedoped ferromagnetic insulating La1-xCaxMnO3 manganite at low temperatures. The cut-off frequency depends on dc current bias and temperature. The high frequency cut-off has been tentatively associated with intrinsic limits of the appearance of 1/f noise in the hopping regime of the Coulomb glass state. The assumption is validated by the fact that the Efros-Shklovskii temperature TES, estimated from the fit of the model to the experimentally measured temperature dependence of the cut-off frequency, has the same value as the temperature TES evaluated independently from the temperature dependence of the resistivity in the corresponding temperature range.

Original languageEnglish
Article number054024
JournalJournal of Statistical Mechanics: Theory and Experiment
Volume2016
Issue number5
DOIs
StatePublished - 1 Jan 2016

Keywords

  • Disordered systems (experiments)
  • Electrical and magnetic phenomena (experiments)
  • Energy landscapes (experiments)
  • Fluctuations (experiments)

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