Field Induced Lattice Deformation in the Quantum Antiferromagnet SrCu<SUB>2</SUB>(BO<SUB>3</SUB>)<SUB>2</SUB>

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Author(s)

Abstract

The results of synchrotron X-ray diffraction by the coupled dimer compound SrCu<SUB>2</SUB>(BO<SUB>3</SUB>)<SUB>2</SUB> subjected to a pulsed high magnetic field are reported. We find the lattice constant, <I>a</I>, 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 Cu<SUP>2+</SUP> spins is an antiferromagnetic one through an oxygen and its strength depends on the bond angle Cu<SUP>2+</SUP>–O<SUP>2−</SUP>–Cu<SUP>2+</SUP>. 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.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 78(4), 043702-043702, 2009

    THE PHYSICAL SOCIETY OF JAPAN

Codes

  • NII Article ID (NAID)
    130005437398
  • Text Lang
    ENG
  • ISSN
    0031-9015
  • Data Source
    J-STAGE 
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