Large magnetoresistance and spin-polarized heavy-mass electron state of the doped valence-bond solid (Ti1-xVx)2O 3

Masaki Uchida, Yoshinori Onose, Yoshinori Tokura

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1 Citation (Scopus)

Abstract

A heavy-mass electron state is realized in a doped valence bond solid (Ti1-xVx)2O3. In this system, itinerant holes mediate the mainly ferromagnetic RKKY interaction between the localized magnetic moments and become readily spin-polarized under a magnetic field, while showing large negative magnetoresistance. In spite of the ferromagnetic interaction among the carriers, their effective mass is found to be 1 or 2 orders of magnitude larger than that of usual doped semiconductors. Such strong mass renormalization is ascribable to the polaron formation on the Ti-dimer, where the spin-singlet state is originally formed. Doping dependence of the electronic specific-heat coefficient implies that the dimeric lattice fluctuation or softening is responsible for the enhanced electron-phonon interaction.

Original languageEnglish
Article number052404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number5
DOIs
Publication statusPublished - 2011 Feb 23
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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