Giant electrothermal conductivity and spin-phonon coupling in an antiferromagnetic oxide

C. Chiorescu, J. J. Neumeier, J. L. Cohn

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The application of weak electric fields (100V/cm) is found to dramatically enhance the lattice thermal conductivity of the antiferromagnetic insulator CaMnO3 over a broad range of temperature about the Néel ordering point (125 K). The effect is coincident with field-induced detrapping of bound electrons, suggesting that phonon scattering associated with short- and long-ranged antiferromagnetic order is suppressed in the presence of the mobilized charge. This interplay between bound charge and spin-phonon coupling might allow for the reversible control of spin fluctuations using weak external fields.

Original languageEnglish (US)
Article number257202
JournalPhysical Review Letters
Volume101
Issue number25
DOIs
StatePublished - Dec 15 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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