TY - JOUR
T1 - Field induced lattice deformation in a quasi-one-dimensional antiferromagnet BaCo2V2O8
AU - Kimura, Shojiro
AU - Narumi, Yasuo
AU - Terada, Noriki
AU - Tanaka, Yoshikazu
AU - Iwaki, Masahiro
AU - Katsumata, Koichi
AU - Hagiwara, Masayuki
AU - Kindo, Koichi
AU - He, Zhangzhen
AU - Taniyama, Tomoyasu
AU - Itoh, Mitsuru
AU - Toyokawa, Hidenori
AU - Ishikawa, Tetsuya
AU - Kitamura, Hideo
PY - 2010/4
Y1 - 2010/4
N2 - 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.
AB - 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.
KW - BaCoVOCQuasi-one-dimensional antiferromagnet
KW - Exchange interaction
KW - High magnetic field
KW - Magneto-elastic coupling
KW - Synchrotron X-ray diffraction
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U2 - 10.1143/JPSJ.79.043706
DO - 10.1143/JPSJ.79.043706
M3 - Article
AN - SCOPUS:77951443952
VL - 79
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 4
M1 - 043706
ER -