JOPSS:検索結果一覧

検索結果：　3 件中 1件目～3件目を表示

発表形式

Initialising ...

選択項目を絞り込む

掲載資料名

Initialising ...

発表会議名

Initialising ...

筆頭著者名

Initialising ...

キーワード

Initialising ...

使用言語

Initialising ...

発行年

Initialising ...

開催年

Initialising ...

論文

Spontaneous topological Hall effect induced by non-coplanar antiferromagnetic order in intercalated van der Waals materials

高木寛貴*; 高木里奈*; 見波将*; 野本拓也*; 大石一城*; 鈴木通人*; 柳有起*; 平山元昭*; Khanh, N.*; 軽部皓介*; et al.

Nature Physics, 19(7), p.961 - 968, 2023/07

https://doi.org/10.1038/s41567-023-02017-3

被引用回数：8 パーセンタイル：96.03(Physics, Multidisciplinary)

In ferromagnets, electric current generally induces a transverse Hall voltage in proportion to the internal magnetization. This effect is frequently used for electrical readout of the spin up and down states. While these properties are usually not expected in antiferromagnets, recent theoretical studies predicted that non-coplanar antiferromagnetic order with finite scalar spin chirality - meaning a solid angle spanned by neighboring spins - can induce a large spontaneous Hall effect even without net magnetization or external magnetic field. This phenomenon, the spontaneous topological Hall effect, can potentially be used for the efficient electrical readout of the antiferromagnetic states, but it has not been experimentally verified due to a lack of appropriate materials hosting such magnetism. Here, we report the discovery of all-in-all-out type non-coplanar antiferromagnetic order in triangular lattice compounds CoTa $_{3}$ S $_{6}$ and CoNb $_{3}$ S $_{6}$ . These compounds are reported to host unconventionally large spontaneous Hall effect despite their vanishingly small net magnetization, and our analysis reveals that it can be explained in terms of the topological Hall effect that originates from the fictitious magnetic field associated with scalar spin chirality. These results indicate that the scalar spin chirality mechanism offers a promising route to the realisation of giant spontaneous Hall response even in compensated antiferromagnets, and highlight intercalated van der Waals magnets as a promising quasi-two-dimensional material platform to enable various nontrivial ways of electrical reading and possible writing of non-coplanar antiferromagnetic domains.

論文

Emergent phenomena in perovskite-type manganites

田口康二郎*; 酒井英明*; 奥山大輔*; 石渡晋太郎*; 藤岡淳*; 福田竜生; 橋爪大輔*; 賀川史敬*; 高橋陽太郎*; 島野亮*; et al.

Physica B; Condensed Matter, 407(11), p.1685 - 1688, 2012/06

https://doi.org/10.1016/j.physb.2012.01.006

被引用回数：5 パーセンタイル：23.98(Physics, Condensed Matter)

Perovskite-type manganites exhibit various interesting phenomena arising from complex interplay among spin, charge, orbital, and lattice degrees of freedom. As the respective examples, perovskite-type YMnO and Sr $_{1-x}$ BaMnO are discussed. In the YMnO, the ferroelectric lattice distortion associated with the -type spin order is observed for the first time. Displacement-type ferroelectricity with off-center magnetic ions is discovered for Sr $_{0.5}$ Ba $_{0.5}$ MnO, which shows both large polarization value and strong coupling between ferroelectricity and magnetism.

論文

Anomalous metallic state in the vicinity of metal to valence-bond solid insulator transition in LiVS $_{2}$

片山尚幸*; 内田正哉*; 橋爪大輔*; 新高誠司*; 松野丈夫*; 松村大樹; 西畑保雄; 水木純一郎; 竹下直*; Gauzzi, A.*; et al.

Physical Review Letters, 103(14), p.146405_1 - 146405_4, 2009/10

https://doi.org/10.1103/PhysRevLett.103.146405

被引用回数：59 パーセンタイル：88.48(Physics, Multidisciplinary)

三角格子を持ち、価電子結合固体状態を持つことで知られるLiVS $_{2}$ とLiVSe $_{2}$ について研究を行った。金属と強相関系絶縁体の境目にあるLiVS $_{2}$ は、金属から価電子結合固体絶縁体への転移を305Kにて示した。金属-絶縁体転移の近傍で価電子結合固体状態が観測されたことは、価電子結合固体状態を考える際の電子の遍歴性の重要さを示している。高温金属層に見られる擬ギャップ状態についても議論を行った。また、LiVSe $_{2}$ は2Kまで金属状態であった。