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Dynamical spin–orbital correlation in the frustrated magnet Ba3CuSb2O9

Author

Listed:
  • Yuki Ishiguro

    (Graduate School of Engineering Science, Osaka University)

  • Kenta Kimura

    (Institute for Solid State Physics, The University of Tokyo)

  • Satoru Nakatsuji

    (Institute for Solid State Physics, The University of Tokyo)

  • Satoshi Tsutsui

    (Japan Synchrotron Radiation Research Institute, SPring-8, Sayo)

  • Alfred Q. R. Baron

    (Japan Synchrotron Radiation Research Institute, SPring-8, Sayo
    Materials Dynamics Laboratory, RIKEN SPring-8 Center, RIKEN, Sayo)

  • Tsuyoshi Kimura

    (Graduate School of Engineering Science, Osaka University)

  • Yusuke Wakabayashi

    (Graduate School of Engineering Science, Osaka University)

Abstract

At low temperatures, atomic magnetic moments usually exhibit some order, for example ferromagnetic order. An exception is frustrated magnets, in which the symmetry impedes the minimization of energy by pairwise magnetic interactions. In such frustrated magnets, new quantum phases, such as spin liquids, are expected. Theoretically, a quantum liquid based on the orbital degree of freedom has also been considered possible when spin and orbital degrees of freedom are entangled. However, to date, experimental observation of such a dynamic spin–orbital state has been a challenge. Here we report an X-ray scattering study of a dynamic spin–orbital state in the frustrated magnet Ba3CuSb2O9. Orbital dynamical motion and increasing short-range orbital correlation with cooling are observed. The most significant feature is that the temperature variation of the orbital correlation is clearly affected by the magnetic interaction. This finding strongly supports a new quantum state in which spins and orbitals are entangled.

Suggested Citation

  • Yuki Ishiguro & Kenta Kimura & Satoru Nakatsuji & Satoshi Tsutsui & Alfred Q. R. Baron & Tsuyoshi Kimura & Yusuke Wakabayashi, 2013. "Dynamical spin–orbital correlation in the frustrated magnet Ba3CuSb2O9," Nature Communications, Nature, vol. 4(1), pages 1-6, October.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3022
    DOI: 10.1038/ncomms3022
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