Magnetic excitation in La1.5Ca0.5CoO4

K. Horigane, K. Yamada, H. Hiraka, J. Akimitsu

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We examined checkerboard charge and spin order in La1.5Ca0.5CoO4 by elastic and inelastic neutron scattering. We discovered the sharp magnetic peaks with l=half-integer and broad magnetic peaks with l=integer in (0.5, 0, l). The origin of magnetic scattering can be explained by the minority and majority stacking arrangement of Co2+/Co3+ spins along the c-axis since the same magnetic reflections arise from the two stacking vectors in La0.5Sr1.5MnO4. Spin-wave dispersion at majority stacking is seen up to 16 meV, in contrast to 50 meV in La1.5Sr0.5NiO4. This indicates a much weaker exchange interaction in the cobaltates than in nickelates. The dispersion at majority stacking has almost a same one with that of minority stacking.

Original languageEnglish
Pages (from-to)774-776
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 1
DOIs
Publication statusPublished - Mar 1 2007
Externally publishedYes

Keywords

  • Checkerboard charge order
  • Cobaltate
  • Magnetic excitation
  • Majority and minority stacking

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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