Field induced lattice deformation in the quantum antiferromagnet SrCu 2(BO3)2

Yasuo Narumi, Noriki Terada, Yoshikazu Tanaka, Masahiro Iwaki, Koichi Katsumata, Koichi Kindo, Hiroshi Kageyama, Yutaka Ueda, Hidenori Toyokawa, Tetsuya Ishikawa, Hideo Kitamura

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11 Citations (Scopus)


The results of synchrotron X-ray diffraction by the coupled dimer compound SrCu2(BO3)2 subjected to a pulsed high magnetic field are reported. We find the lattice constant, a, contracts with increasing magnetic field. This change in the lattice constant scales with the magnetization change. We argue that the nearest neighbor exchange interaction between Cu2+ spins is an antiferromagnetic one through an oxygen and its strength depends on the bond angle Cu2+-O2-Cu 2+. The bond length between the Cu ions in a triplet becomes shorter to make the bond angle smaller and to diminish the antiferromagnetic exchange interaction. We propose this mechanism as a main source of the lattice contraction.

Original languageEnglish
Article number043702
Journaljournal of the physical society of japan
Issue number4
Publication statusPublished - 2009 Apr
Externally publishedYes


  • Exchange interaction
  • High magnetic field
  • Magneto-elastic coupling
  • SrCu(BO)
  • Synchrotron X-ray diffraction

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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