Solid and Condensed State Physics

The European Physical Journal B - Condensed Matter and Complex Systems

, Volume 52, Issue 2, pp 199-203

Dielectric catastrophe at the magnetic field induced insulator to metal transition in Pr1-xCaxMnO3(x = 0.30, 0.37) crystals

  • B. KundysAffiliated withLaboratoire CRISMAT, CNRS UMR 6508 Email author 
  • , N. BellidoAffiliated withLaboratoire CRISMAT, CNRS UMR 6508
  • , C. MartinAffiliated withLaboratoire CRISMAT, CNRS UMR 6508
  • , Ch. SimonAffiliated withLaboratoire CRISMAT, CNRS UMR 6508

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The dielectric permittivity and resistivity have been measured simultaneously as a function of magnetic field in Pr1-xCaxMnO3 crystals with different doping. A huge increase of dielectric permittivity was detected near percolation threshold. The dielectric and conductive properties are found to be mutually correlated throughout insulator to metal transition evidencing the dielectric catastrophe phenomenon. Data are analyzed in a framework of Maxwell-Garnett theory and the Mott-Hubbard theory attributed to the role of strong Coulomb interactions.


71.45.Gm Exchange, correlation, dielectric and magnetic response functions, plasmons 81.40.Tv Optical and dielectric properties 77.80.-e Ferroelectricity and antiferroelectricity