Dynamical Jahn-Teller effect in a spin-orbital coupled system

Joji Nasu, Sumio Ishihara

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Dynamical Jahn-Teller (DJT) effect in a spin-orbital coupled system on a honeycomb lattice is examined, motivated from recently observed spin-liquid behavior in Ba3CuSb2O9. An effective vibronic Hamiltonian, where the superexchange interaction and the DJT effect are taken into account, is derived. We find that the DJT effect induces a spin-orbital resonant state where local spin-singlet states and parallel orbital configurations are entangled with each other. This spin-orbital resonant state is realized in between an orbital-ordered state, where spin-singlet pairs are localized, and an antiferromagnetic ordered state. Based on the theoretical results, a possible scenario for Ba3CuSb2O9 is proposed.

Original languageEnglish
Article number094408
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
Publication statusPublished - 2013 Sep 6

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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