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Intrinsic metastability of low doped manganites: La0.8Ca0.2MnO3 case

  • V. Markovich
  • G. Jung
  • Y. Yuzhelevski
  • G. Gorodetsky
  • Y. M. Mukovskii
Solid and Condensed State Physics

Abstract.

Transport properties of phase separated La0.8Ca0.2MnO3 crystals in the aged highly resistive metastable state were studied. It was found that the coexistence of different ferromagnetic phases at low temperatures is sensitive to electric current/field. In a contrast with the previously studied low resistivity metastable states the high resistivity state exhibits positive magnetoresistance and significant current dependence of the resistivity even at temperatures much higher than the Curie temperature. Application of current pulses results in appearance of zero bias anomaly in the current dependent conductivity. Similarly to the low resistivity metastable states the memory of the resistivity can be erased only after heating of the sample to Te ≈360 K. After one year storage at room temperature the La0.8Ca0.2MnO3 samples show clear signatures of aging. The aged samples spontaneously evolute towards high resistivity states. The results are discussed in the context of a coexistence of two ferromagnetic phases with different orbital order and different conductivity. The metallic ferromagnetic phase seems to be less stable giving rise to the experimentally observed electric field effects and aging.

Keywords

Neural Network Transport Property Curie Temperature Current Pulse Manganite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  • V. Markovich
    • 1
  • G. Jung
    • 1
  • Y. Yuzhelevski
    • 1
  • G. Gorodetsky
    • 1
  • Y. M. Mukovskii
    • 2
  1. 1.Department of PhysicsBen Gurion University of the NegevBeer ShevaIsrael
  2. 2.Moscow State Steel and Alloys InstituteMoscowRussia

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