Low-temperature permittivity of insulating perovskite manganites

Joshua Cohn, M. Peterca, J. J. Neumeier

Research output: Contribution to journalArticle

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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 2004

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Manganites
Perovskite
Permittivity
permittivity
Temperature
Binding energy
Charge carriers
Ground state
charge carriers
coverings
binding energy
Doping (additives)
Impurities
low frequencies
impurities
conductivity
ground state
perovskite
Chemical analysis

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Low-temperature permittivity of insulating perovskite manganites. / Cohn, Joshua; Peterca, M.; Neumeier, J. J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 70, No. 21, 214433, 12.2004, p. 1-6.

Research output: Contribution to journalArticle

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