Magnetic ordering in trigonal chain compounds

V. Eyert*, Udo Schwingenschloegl, C. Hackenberger, T. Kopp, R. Frésard, U. Eckern

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We present electronic structure calculations for the one-dimensional magnetic chain compounds Ca3CoRhO6 and Ca3FeRhO6. The calculations are based on density functional theory and the local density approximation. We use the augmented spherical wave (ASW) method. The observed alternation of low- and high-spin states along the Co-Rh and Fe-Rh chains is related to differences in the oxygen coordination of the transition metal sites. Due to strong hybridization the O 2p states are polarized, giving rise to extended localized magnetic moments centered at the high-spin sites. Strong metal-metal overlap along the chains leads to a substantial contribution of the low-spin Rh 4 d3 z2 - r2 orbitals to the exchange coupling of the extended moments. Interestingly, this mechanism holds for both compounds, even though the coupling is ferromagnetic for cobalt and antiferromagnetic for the iron compound. However, our results allow to understand the different types of coupling from the filling dependence of the electronic properties.

Original languageEnglish (US)
Pages (from-to)156-161
Number of pages6
JournalProgress in Solid State Chemistry
Volume36
Issue number1-2
DOIs
StatePublished - Jan 1 2008

Keywords

  • Density functional theory
  • Geometrical frustration
  • Low-dimensional compounds
  • Magnetic chains

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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