Local structural analysis of half-metallic ferromagnet CrO2

Katsuaki Kodama, Kazutaka Ikeda, Masahiko Isobe, Hikaru Takeda, Masayuki Itoh, Yutaka Ueda, Shin Ichi Shamoto, Toshiya Otomo

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2 Citations (Scopus)

Abstract

We have performed powder neutron diffraction on the half-metallic ferromagnet CrO2 which has a rutile-type crystal structure with a tetragonal unit cell. Although the powder diffraction pattern can be fitted by the reported crystal structure including a single Cr site, the atomic pair distribution function (PDF) can be fitted by the structural model with an orthorhombic unit cell including two kinds of inequivalent Cr sites. The difference between the valences of the two inequivalent Cr sites, δ of Cr+4±δ, estimated from the local structural parameters is about 0.06. The shapes of the two CrO6 octahedra are slightly different, suggesting the short-range orbital ordering of the Cr 3d orbitals. The lattice distortion and the improvement of the fitting to the PDF obtained using the locally distorted structure model are apparent in the region below about 10 Å, suggesting that the domain size or correlation length of the locally distorted structure is about 10 Å, roughly corresponding to the size of two unit cells.

Original languageEnglish
Article number094709
JournalJournal of the Physical Society of Japan
Volume85
Issue number9
DOIs
Publication statusPublished - 2016 Sep 15

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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