Two level telegraphic conductivity fluctuations in ferromagnetic insulating manganite single crystals

Jacek Przybytek, Jan Fink-Finowicki, Grzegorz Jung

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Robust two-level telegraph conductivity noise in phase separated ferromagnetic insulating manganite La0.86Ca0.14MnO3 has been observed in exceptionally wide temperature range 130 K - 185 K in the low-resistivity metastable state of the system. The switching rate of the telegraphic noise was found not to depend on applied magnetic field and bias current. In contrast, the amplitude of the telegraphic noise varies in a non monotonic way with decreasing temperature and goes through a clear maximum around 160 K. The amplitude decreases exponentially with increasing bias current in exactly the same manner as the sample resistance increases with the current. This features point out to the dynamic current redistribution between distinct percolation paths in the phase separated material as a possible mechanism behind the robust two-level conductivity fluctuations.

Original languageEnglish
Title of host publication2017 International Conference on Noise and Fluctuations, ICNF 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509027606
DOIs
StatePublished - 19 Jul 2017
Event2017 International Conference on Noise and Fluctuations, ICNF 2017 - Vilnius, Lithuania
Duration: 20 Jun 201723 Jun 2017

Publication series

Name2017 International Conference on Noise and Fluctuations, ICNF 2017

Conference

Conference2017 International Conference on Noise and Fluctuations, ICNF 2017
Country/TerritoryLithuania
CityVilnius
Period20/06/1723/06/17

Keywords

  • Conductivity fluctuations
  • ferromagnetic insulators
  • manganites
  • random telegraph noise

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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