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    • Keywords


      Manganite; electrical resistivity; magnetoresistance; percolation model.

    • Abstract


      In this study, we have tried to simulate both temperature and magnetic field dependence of electrical resistivity for polycrystalline La$_{0.75}$Ho$_{0.05}$Sr$_{0.2}$MnO$_3$. The studied sample was elaborated by sol–gel method. The energydispersiveX-ray confirms the presence of Ho element. The temperature dependence of resistivity in the whole temperature range (100–300 K) was successfully fitted by phenomenological percolation model, testifying the percolative natureof the electrical transition. The evolution of the volume fraction of the ferromagnetic phase is in agreement with the magnetic properties. The magnetic field dependence of resistivity follows the recently established universal behaviour of resistivity, which may confirm the validity of this model.

    • Author Affiliations



      1. Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Université de Sfax, 3000 Sfax, Tunisia
      2. Institut Néel, 38042 Grenoble Cedex 9, France
    • Dates

  • Bulletin of Materials Science | News

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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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      Posted on July 25, 2019

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