Metal-Insulator Transition and Orbital Order in PbRuO3

Simon A. J. Kimber, Jennifer A. Rodgers, Hua Wu, Claire A. Murray, Dimitri N. Argyriou, Andrew N. Fitch, Daniel I. Khomskii, J. Paul Attfield

Research output: Contribution to journalArticlepeer-review

Abstract

Anomalous low temperature electronic and structural behavior has been discovered in PbRuO3. The structure [space group Pnma, a=5.563 14(1), b=7.864 68(1), c=5.614 30(1) A] and metallic conductivity at 290 K are similar to those of SrRuO3 and other ruthenate perovskites, but a sharp metal-insulator transition at which the resistivity increases by 4 orders of magnitude is discovered at 90 K. This is accompanied by a first-order structural transition to an Imma phase [a=5.569 62(1), b=7.745 50(1), c=5.662 08(1) A at 25 K] that shows a coupling of Ru4+ 4d orbital order to distortions from Pb2+ 6s6p orbital hybridization. The Pnma to Imma transition is an unconventional reversal of the group-subgroup symmetry relationship. No long range magnetic order is evident down to 1.5 K. Calculations show that Pb 6s6p and Ru 4d orbital hybridization and strong spin-orbit coupling are significant.

Original languageEnglish
Article number046409
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Volume102
Issue number4
DOIs
Publication statusPublished - 30 Jan 2009

Keywords

  • MAGNETIC-PROPERTIES
  • SRRUO3
  • DIFFRACTION
  • PEROVSKITES
  • CARUO3
  • SR

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