Neutron scattering spectroscopic study on superconducting-antiferromagnetic phase diagram and pseudo-gap state

将中子散射和大晶体生长技术相结合，在研究包括超导体在内的金属磁体的磁性和电导率关系方面取得了新的重要成果。(1)用中子散射和X射线散射综合研究了铜酸盐超导体的磁-超导相图。因此，我们成功地区分了相图的共同特征和与材料有关的特征，这些特征为提高超导转变温度提供了关键信息。我们提出了一个简单的模型来定性地描述金属磁体独特的和共同的磁激发，这是传统的自旋波模型无法理解的。(2)在日本首次获得了高质量的大单晶Cu2MnAl，并首次建造了垂直聚焦的中子偏振器。

Combination of neutron scattering and large crystal-growth techniques obtained new and important results on the relation between magnetism and electric conductivity for metallic magnets including superconductors.(1)The magnetic-superconducting phase diagram was comprehensively studied for cuprate superconductors by neutron scattering and X-ray scattering. As a result, we succeeded in discriminating common and material-dependent features of the phase diagram, which provide key information towards higher superconducting transition temperature.We proposed a simple model to describe qualitatively the unique and common magnetic excitation of metallic magnets which cannot be understood by a conventional spin-wave model.(2)High quality large single crystal of Cu2MnAl was reproducibly obtained and vertically focused neutron polarizer was constructed for the first time in Japan.