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Title :遍歴電子スピン系動的階層構造の中性子散乱分光研究
Title alternative :Neutron scattering spectroscopic study of dynamical hierarchical structure of itinerant electron spin system
Authors :平賀, 晴弘
Authors alternative :Hiraka, Haruhiro
Issue Date :8-Jun-2017
Abstract :研究成果の概要(和文): 反強磁性金属Crの磁気励起を300 meV弱まで観測することに成功した。スピン密度波形成に伴うエネルギーギャップがその磁気励起スペクトルに現れていること、本研究チームが提唱する「スピンユニットモデル」で、Crの磁気散乱断面積が定性的に説明できることを見出した。本研究では他の反強磁性金属も調べ、チムニー構造という共通する磁気励起が存在する可能性を支持する結果を得た。次のステップとなる強磁性金属の調査を見据え、幾つかの強磁性金属の大型単結晶育成を行った。偏極中性子実験技術の発展と物性研究への普及を目指し、デバイス開発と偏極中性子回折実験による磁気構造解析を行った。研究成果の概要(英文): We succeeded to observe the magnetic excitation of the antiferromagnetic metal Cr up to under 300 meV. We found that the energy gap due to the formation of spin density wave appears in its magnetic excitation spectrum and that the magnetic scattering cross section of Cr can be qualitatively explained by the "spin unit model" proposed by this research team. In this study, other antiferromagnetic metals were also investigated, and the results supporting the possibility of the common magnetic excitation of the chimney structure existed were obtained. In anticipation of the investigation of ferromagnetic metals, which is the next step, we have grown large single crystals of ferromagnetic metals. Under the aim of technical development and dissemination of polarized neutron experiments for physical property research, we conducted device development and magnetic structure analysis by polarized neutron diffraction experiment.
Type Local :科研等報告書
Publisher :茨城大学
URI :http://hdl.handle.net/10109/14198
Appears in Collections:Grants-in-aid for scientific research Report (College of Science)

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