Nonmagnetic spin-singlet dimer formation and coupling to the lattice in the 6H perovskite Ba3CaRu2O9

Mark S. Senn*, Angel M. Arevalo-Lopez, Takashi Saito, Yuichi Shimakawa, J. Paul Attfield

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Non-conservation of magnetic neutron scattering from the six-layer hexagonal perovskite Ba3CaRu2O9 on cooling reveals that. (Ru5+)2 dimers form nonmagnetic spin-singlet ground states. This is in contrast to Ba3CaRu2O9 (B = Co or Ni) analogues which display long range spin ordered ground states containing antiferromagnetic. (Ru5+)2 dimers ( Lightfoot and Battle 1990 J. Solid State Chem. 89 174). Dimer formation is weakly coupled to the lattice, resulting in an excess [101] microstrain broadening of diffraction peaks at low temperatures. Non-conservation of magnetic neutron scattering is also observed around the charge ordering transition in Ba3CaRu2O9 showing that the ground state structure is coupled to spin-singlet formation in charge ordered Ru2O9 dimers.

Original languageEnglish
Article number496008
Number of pages6
JournalJournal of Physics: Condensed Matter
Volume25
Issue number49
DOIs
Publication statusPublished - 11 Dec 2013

Keywords

  • MAGNETIC-PROPERTIES
  • POWDER DIFFRACTION
  • CRYSTAL
  • TRANSITION

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