Field induced lattice deformation in a quasi-one-dimensional antiferromagnet BaCo2V2O8

Shojiro Kimura, Yasuo Narumi, Noriki Terada, Yoshikazu Tanaka, Masahiro Iwaki, Koichi Katsumata, Masayuki Hagiwara, Koichi Kindo, Zhangzhen He, Tomoyasu Taniyama, Mitsuru Itoh, Hidenori Toyokawa, Tetsuya Ishikawa, Hideo Kitamura

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5 Citations (Scopus)


Synchrotron X-ray diffraction is used to study the correlation between crystal structure and magnetism in a quasi-one-dimensional uniaxial antiferromagnet BaCo2V2O8. When an external magnetic field, B, is applied parallel to the c-axis in the short-range-ordered phase, the lattice constant, a elongates, while c shrinks with increasing B. We calculate the exchange energy under applied magnetic fields based on the proposed magnetic structure. We are successful in explaining the contrasting behavior of the lattice deformations. Our calculation shows that the change in the lattice constants is proportional to M2, where M is the magnetization. A good agreement between theory and experiment is obtained for the a-axis up to the saturation field, Bs. Above Bs, an M4 term is necessary, in addition to the M2 one, to obtain a better agreement. For the c-axis, a sum of the M2 and M 4 terms gives a reasonable fit to the experimental data.

Original languageEnglish
Article number043706
JournalJournal of the Physical Society of Japan
Issue number4
Publication statusPublished - 2010 Apr


  • BaCoVOCQuasi-one-dimensional antiferromagnet
  • Exchange interaction
  • High magnetic field
  • Magneto-elastic coupling
  • Synchrotron X-ray diffraction


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