We have performed the high-field ESR of the one-dimensional BaCu 2(Si1-xGex)2O7 (x = 0.65) antiferromagnet at 0.5 and 1.8 K in the wider frequency and magnetic field region (40-500 GHz, up to 30 T), and found the breather excitation predicted by the Oshikawa-Affleck (OA) theory. The observed field-induced gap for B||c (chain direction) shows the B2/3 dependence suggested by the OA theory, and the dependence is weak for the other directions which is consistent with the anisotropy of the Dzyaloshinsky-Moriya interaction. The results will be also discussed in connection with the breather excitation observed in Cu-benzoate.
|ジャーナル||Journal of Magnetism and Magnetic Materials|
|出版ステータス||出版済み - 5 2004|
|イベント||Proceedings of the International Conference on Magnetism - Rome, イタリア|
継続期間: 7 27 2003 → 8 1 2003
All Science Journal Classification (ASJC) codes