Development of 30 T Repeating Pulsed Field

30T重复脉冲场的研制

• 批准号: 10554013
• 负责人: NOJIRI Hiroyuki
• 金额: $ 4.29万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10554013/
• 关键词: High Magnetic Fields; Neutron Scattering; Phase Transition

A repeating pulsed field system has been developed for the neutron diffraction experiments in high magnetic fields. Magnetic fields as high as 30 T can be generated by using the present system. Magnetic fields above 25 T have not been obtained by way of a superconducting magnet. Therefore, the present field intensity is the highest field for neutron diffraction in the world. As the magnet, 3-layer Bitter type magnet is used. The use of the 3-layer structure improves the electric and mechanical contacts between the adjacent layers and the loge life-time of magnet is achieved.As the first test of the neutron diffraction experiments above 25 T, we have investigated the metamagnetic phase transition in a triangular lattice anti-ferromagnet CuFeO2. The change of the magnetic structure from the incommensurate to the commensurate structure was found around 20 T. The neutron diffraction experiments in Dy Cu was also made and the nature of metamagentic transition was investigated. The present results have established the feasibility of the neutron diffraction experiments in very high fields above 20 T by using a repeating pulsed magnetic field system.

为高磁场中的中子衍射实验开发了重复的脉冲场系统。可以使用当前系统生成高达30 T的磁场。超过25吨的磁场尚未通过超导磁体获得。因此，当前的场强度是世界上中子衍射的最高场。当使用磁铁时，使用了3层苦味型磁铁。 3层结构的使用改善了相邻层之间的电和机械接触，并实现了磁铁的lige寿命。作为在25 t上方的中子衍射实验的首次测试，我们研究了三角形晶格抗ferromagnet cufeo2中的跨磁相变。在20 t左右发现了磁性结构从不相称的结构的变化。还进行了Dy Cu中的中子衍射实验，并研究了元载质过渡的性质。目前的结果已经通过使用重复的脉冲磁场系统在高于20 t的非常高场中的中子衍射实验的可行性。

项目成果

H. Nojiri et al.: "30 T Repeating Pulsed Field System for Neutron Diffraction"IEEE. Trans. Mag.. (in print). (2000)

H. Nojiri 等人：“用于中子衍射的 30 T 重复脉冲场系统”IEEE。

H.Nojiri: "Neutron Diffraction Experiments in Repeating Pulsed High Magnetic Fields." Physica B. 246-247. 175-178 (1998)

H.Nojiri：“重复脉冲高磁场中的中子衍射实验。”

H.Nojiri et al.: "Neutron diffraction Experiments in Repeating Pulsed High Magnetic Field"Physica B. 246-247. 175-178 (1998)

H.Nojiri 等人：“重复脉冲高磁场中的中子衍射实验”Physica B.246-247。

M. Motokawa, N. Miura: "Experimental Physics Basic Technique II Chapter 3"Maruzen Pub.. 11 (1999)

M. Motokawa、N. Miura：“实验物理基本技术 II 第 3 章”Maruzen Pub.. 11 (1999)

S.Mitsuda: "Neutron Diffraction Study of Triangler Lattice Antiferromagnet CuFeO_2 under High Magnetic Field" J.Phys.Chem.Solids. (出版中). (1999)

S.Mitsuda：“高磁场下三角晶格反铁磁体 CuFeO_2 的中子衍射研究”J.Phys.Chem.Solids（出版中）。