NMR Investigation on the Electric Properties of Quasi-crystals

准晶体电学性质的核磁共振研究

• 批准号: 62540229
• 负责人: YASUOKA Hiroshi
• 金额: $ 1.34万
• 依托单位: Institute for Solid State Physics, University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62540229/
• 关键词: Quasicrystals; NMR; Magnetism in quasicrystal; 準結晶の局在磁気モーメント

The nuclear magnetic resonance (NMR) technique has been utilized to investigate the electronic properties of quasi-crystals. Our par-ticular efforts have been focused on understanding of the magnetic properties of quasi-crystals, in contrast to their crystal phases. The quasi-crystals of Al-Mn, Al-Mn-Si, Al-Mn-Si-Lu, Al-Li-Cu and Mg-Ga-Zn systems have been prepared by the single roller metalquenching technique and the crystal phases have been obtained by proper heat treatment of respective alloys. The Al, Mn, Li and Ga NMR signals have been successfully observed in these alloys and the temperature dependence of the line profile and the nuclear relaxation time have been measured. Combining these results with the susceptibility measurements, the following conclusions are emerged. 1. For the alloys with transition metals only the Mn atoms has magnetic moments. 2. These magnetic moments are strongly enhanced in the quasi-crystals and a spin glass type magnetic order has been observed some of the quasi-crystals. 3. From the nuclear relaxation studies, the enhancement of the magnetism in quasi-crystals has also been observed even in the non-transition metal alloys.

利用核磁共振（NMR）技术研究了准晶体的电子性质。我们的特别努力一直集中在理解准晶体的磁性，相对于它们的晶相。用单辊金属淬火技术制备了Al-Mn，Al-Mn-Si，Al-Mn-Si-Lu，Al-Li-Cu和Mg-Ga-Zn系的准晶，并对各合金进行了适当的热处理，获得了相应的晶相。在这些合金中成功地观察到Al、Mn、Li和Ga的NMR信号，并测量了谱线轮廓和核弛豫时间的温度依赖性。将这些结果与磁化率测量相结合，得出以下结论。1.对于含有过渡金属的合金，只有Mn原子具有磁矩。2.这些磁矩强烈增强的准晶体和自旋玻璃型磁序已被观察到的一些准晶体。3.从核弛豫研究来看，即使在非过渡金属合金中也观察到准晶体磁性的增强。

项目成果

Eiichi EDAGAWA: J. Phys. Soc. Japan. 56. 2629-2631 (1987)

枝川英一：J. Phys。

Hirokazu FUJIMAKI.: J.Phys.Soc.Jpn.

藤卷宏和：J.Phys.Soc.Jpn。

Kaoru KIMURA: International Meeting on Advanced Materials.

Kaoru KIMURA：先进材料国际会议。