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Sheng, Q.*; 金子 竜也*; Yamakawa, Kohtaro*; Guguchia, Z.*; Gong, Z.*; Zhao, G.*; Dai, G.*; Jin, C.*; Guo, S.*; Fu, L.*; et al.
Physical Review Research (Internet), 4(3), p.033172_1 - 033172_14, 2022/09
A pyrite system NiSSe exhibits a bandwidth controlled Mott transition via (S,Se) substitutions in a two-step process: the antiferromagnetic insulator (AFI) to antiferromagnetic metal (AFM) transition at 0.45 followed by the AFM to paramagnetic metal (PMM) transition at 1.0. Among a few other Mott systems which exhibit similar two-step transitions, Ni(S,Se) is of particular interest because a large intermediate AFM region in the phase diagram would provide unique opportunities to study the interplay between the spin and charge order. By comparing and combining our muon spin relaxation studies and previous neutron scattering studies, here we propose a picture where the spin order is maintained by the percolation of "nonmetallic" localized and dangling Ni moments surrounded by S, while the charge transition from AFI to AFM is caused by the percolation of the conducting paths generated by the Ni-Se-Ni bonds.
杉本 昌義; Jameson, R. A.*; V.Teplyakov*; D.Berwald*; B.Blind*; D.Bruhwiler*; H.Deitinghoff*; Ferdinand, R.*; 金正 倫計; Klein, H.*; et al.
Journal of Nuclear Materials, 258-263, p.367 - 371, 1998/00
被引用回数:0 パーセンタイル:0.01(Materials Science, Multidisciplinary)国際核融合照射施設(IFMIF)の概念設計活動における加速器系の検討結果を報告する。ユーザー要求に基づき、最大40MeVの連続的な250mAの重陽子ビームを2か所のリチウムターゲットへ供給する。加速器は125mA出力のもの2台から構成される。主な要素は140mAの入射器、8MeV出力のRFQ、32-,36-,40MeVから選択可能なDTLもしくは超電導リニアック、最大1MW出力のモジュールから成る高周波源、及びビーム輸送系である。必要な技術開発要素の摘出とそのスケジュール・コスト評価も実施した。