NMR study of the impurity-induced magnetism in the spin-Peierls system

自旋-佩尔斯系统中杂质感生磁性的核磁共振研究

• 批准号: 22540352
• 负责人: KIKUCHI Jun
• 金额: $ 2.75万
• 依托单位: Meiji University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010-04-01 至 2013-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22540352/
• 关键词: スピン・パイエルス転移; 不純物効果; 核磁気共鳴; 核四重極共鳴

In order to elucidate the mechanism for the impurity-induced magnetic ordering in the spin-Peierls compound CuGeO3, we measured nuclear magnetic resonance (NMR) and nuclear quadrupole resonances (NQR) of Cu in the (Cu-Mg)GeO3 and Cu(Ge-Si)O3 systems. In (Cu-Mg)GeO3, we found that NMR and NQR spectra show fine structure due to the presence of several Cu sites which have distinct local structural and/ magnetic environment. In Cu(Ge-Si)O3, we succeeded in determining the size of the ordered magnetic moment of the Cu atom next to the impurity Si atom. The moment is only 1.5 % of the full moment of 1 Bohr magneton of the Cu2+ ion, which strongly suggests that the magnetic moments in the doped CuGeO3 system are not induced near to the impurity atoms.

为了阐明CuGeO 3中杂质诱导磁有序的机制，我们测量了（Cu-Mg）GeO 3和Cu（Ge-Si）O3体系中Cu的核磁共振（NMR）和核四极共振（NQR）.在（Cu-Mg）GeO_3中，我们发现NMR和NQR谱显示了精细结构，这是由于存在几个具有不同局部结构和/或磁环境的Cu位。在Cu（Ge-Si）O_3中，我们成功地测定了杂质Si原子附近的Cu原子的有序磁矩的大小。该磁矩仅为Cu ~（2+）离子的1玻尔磁子全磁矩的1.5%，这有力地表明掺杂CuGeO_3系统中的磁矩在杂质原子附近不是感生的。

项目成果

63,65Cu Nuclear Resonance Study of the Cou-pled Spin Dimers and Chains Compound Cu_2Fe_2Ge_4O_<13>

耦合自旋二聚体和链状化合物Cu_2Fe_2Ge_4O_<13>的63,65Cu核磁共振研究

• DOI: 10.7566/jpsj.82.034710
• 发表时间: 2013
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: J. Kikuchi;S. Nagura;K. Murakami;T. Masuda;and G. J. Redhammer
• 通讯作者: and G. J. Redhammer