Low-temperature permittivity of insulating perovskite manganites

J. L. Cohn, M. Peterca, J. J. Neumeier

Research output: Contribution to journalArticle

64 Scopus citations

Abstract

Measurements of the low-frequency (f≤100 kHz) permittivity (ε) and conductivity (σ) at T≲150 K are reported for La1-xCa xMnO3 (0≤x≤1) and Ca1-ySr yMnO3 (0≤y≤0.75) having antiferromagnetic, insulating ground states covering a broad range of Mn valencies from Mn 3+ to Mn4+. Static dielectric constants are determined from the low-T limiting behavior. With increasing T, relaxation peaks associated with charge-carrier hopping are observed in the real part of the permittivities and analyzed to determine dopant binding energies. The data are consistent with a simple model of hydrogenic impurity levels and imply effective masses m*/me∼3 for the Mn4+ compounds. Particularly interesting is a large dielectric constant (ε0∼100) associated with the C-type antiferromagnetic state near the composition La 0.2Ca0.8MnO3.

Original languageEnglish (US)
Article number214433
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number21
DOIs
StatePublished - Dec 1 2004

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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