Tuning the giant magnetoelastic transition in Ba3BiIr2O9 and Ba3BiRu2O9

Zixin Huang, Maxim Avdeev, Brendan J. Kennedy, Kevin S. Knight, Qingdi Zhou, Chris D. Ling

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We have experimentally investigated the effects of pressure on the magnetoelastic transitions associated with the opening of spin-gaps in Ba3BiIr2O9 and Ba3BiRu2O9. For both compounds, reducing the unit cell volume by either external physical and internal chemical pressure was found to reduce the temperature T* of the transition and, to a lesser extent, the magnitude of the associated negative thermal volume expansion. The results yield the latent heat associated with the transitions, −3.34(3) × 102 J mol−1 for Ba3BiIr2O9 and −7.1(5) × 102 J mol−1 for Ba3BiRu2O9. The transition in Ba3BiRu2O9 is significantly more robust than in Ba3BiIr2O9, requiring an order of magnitude higher pressures to achieve the same reduction in T*. The differing responses of the two compounds points to differences between the 4d and 5d metals and hence to the importance of spin-orbit coupling, which is expected to be much stronger in the Ir compound.
Original languageEnglish
Article number276003
Pages (from-to)1-5
Number of pages5
JournalJournal of Physics: Condensed Matter
Issue number27
Publication statusPublished - 2014
Externally publishedYes


  • high pressure
  • neutron diffraction
  • spin gap
  • chemical pressure


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