ESR Study of a novel elementary excitation : Breather in quantum spin chains

一种新型基元激发的 ESR 研究：量子自旋链中的呼吸器

• 批准号: 12640335
• 负责人: NOJIRI Hiroyuki
• 金额: $ 2.43万
• 依托单位: OKAYAMA UNIVERSITY (2001)Tohoku University (2000)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640335/
• 关键词: Soliton; High Magnetic Field; Non-linear excitation; Antiferromagnetic chain; ESR; 非線形現象; 量子相転移

A non-linear excitation : breather has been studied in a quantum antiferromagnetic chain CuBenzoate by means of ESR. The anisotropy and the field dependence of the field induced gap has been investigated by a high resolution ESR. In low field region, the exponent of the gap on the magnetic field found to be very close to theoretical value of 2/3. A dynamical crossover between the gapped soliton-breather regime and the gapless spinon regime has been found as the anomaly of ESR line shape and line width. By using a Voight configuration, the energy of breather mode has been determined very precisely without a correction of Zeeman term. In the high field regime, a decrease of the exponent is found. A coupling constant of a sign-Gordon model has been experimentally obtained from the accurate field dependence of the breather mass. High field zero field muon spin rotation experiments have been performed down to 16 mK and no evidence of a long range order is found. It shows the extremely good one-dimensionality of Cubenzoate. Several different types of higher order breather excitations have also found.

本文用ESR研究了量子反铁磁链CuBenzoate中的非线性激发呼吸子。用高分辨ESR研究了场致能隙的各向异性和场依赖性。在低场区，发现差距对磁场的指数非常接近理论值2/3。在ESR谱线的形状和线宽上发现了能隙孤子-呼吸子区和无能隙自旋区之间的动力学交叉。利用Voight位形，在不作塞曼项修正的情况下，很精确地确定了呼吸模态的能量。在高场区，指数下降。从呼吸子质量与场的精确关系，实验上得到了一个符号-戈登模型的耦合常数。高场零场μ子自旋旋转实验在低至16 mK时没有发现长程有序的证据，表明Cubenzoate具有非常好的一维性。还发现了几种不同类型的高阶呼吸器激励。

项目成果

H.Nojiri et al.: "Submillimeter wave ESR study on quantum spin systems"Suppl.B.J.Phys.Soc.Jpn. 69. 83-88 (2000)

H.Nojiri 等人：“量子自旋系统的亚毫米波 ESR 研究”Suppl.B.J.Phys.Soc.Jpn。

Y.Ajiro, T.Asano, Y.Inagaki, J-P.Boucher, H.Nojiri 他3名: "High-Field, high-frequency ESR in the one-dimensional quantum spin systems"Suppl.A.J.Phys.Soc.Jpn. 69. 297-302 (2000)

Y.Ajiro、T.Asano、Y.Inagaki、J-P.Boucher、H.Nojiri 和其他 3 人：“一维量子自旋系统中的高场、高频 ESR”Suppl.A.J.Phys.Soc.Jpn。 69. 297-302 (2000)

H.Nojiri et al.: "High-field ESR on quantum spin systems"Physica B. 294-295. 14-19 (2001)

H.Nojiri 等人：“量子自旋系统上的高场 ESR”Physica B. 294-295。

Y. Ajiro, T. Asano, Y. Inagaki, J-P Boucher, H. Nojiri, S. Luther, T. Sakon and M. Motokawa: "High-field, high-frequency ESR in the one-dimensional quantum spin systems"Suppl. A. J. Phys. Soc. Jpn. 69. 297-302 (2000)

Y. Ajiro、T. Asano、Y. Inagaki、J-P Boucher、H. Nojiri、S. Luther、T. Sakon 和 M. Motokawa：“一维量子自旋系统中的高场、高频 ESR”补充

H. Nojiri, K. Onizuka, Y. Ueda, T. Asano, Y. Ajiro and M. Motokawa: "Submillimeter wave ESR study on quantum spin systems"Suppl. B. J. Phys. Soc. Jpn. 69. 83-88 (2000)

H. Nojiri、K. Onizuka、Y. Ueda、T. Asano、Y. Ajiro 和 M. Motokawa：“量子自旋系统的亚毫米波 ESR 研究”增刊。