Impurity conduction and magnetic polarons in antiferromagnetic oxides

C. Chiorescu, Joshua Cohn, J. J. Neumeier

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Low-temperature transport and magnetization measurements, reported for the antiferromagnets SrMn O3 and CaMn O3, provide a means for distinguishing self-trapped from bound magnetic polaron (MPs) and reveal new insight into the role of impurity states on MP formation in oxides. The data identify an impurity band of mobile states separated by energy δ from electrons bound in Coulombic potentials. Very weak electric fields are sufficient to excite bound electrons to the impurity band, increasing the mobile carrier concentration by more than three orders of magnitude. The data indicate that bound MPs become stable only for kB Tδ.

Original languageEnglish (US)
Article number020404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number2
DOIs
StatePublished - Jul 30 2007

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Gene Conversion
Polarons
polarons
Oxides
Impurities
conduction
impurities
oxides
Electrons
Carrier concentration
Magnetization
electrons
Electric fields
magnetization
electric fields
Temperature
energy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Impurity conduction and magnetic polarons in antiferromagnetic oxides. / Chiorescu, C.; Cohn, Joshua; Neumeier, J. J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 76, No. 2, 020404, 30.07.2007.

Research output: Contribution to journalArticle

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