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論文

Mechanical multiplexer of nuclear spin states

中堂博之; 横井直人*; 松尾衛; 針井一哉*; 鈴木淳*; 今井正樹; 佐藤正寛*; 前川禎通*; 齊藤英治*

Physical Review Letters, 134(13), p.130603_1 - 130603_5, 2025/04

https://doi.org/10.1103/PhysRevLett.134.130603

被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)

A spin 1/2 is the simplest system that has been believed to support a single two-level quantum system, represented by a single resonance. We experimentally demonstrate that a spin-1/2 nucleus of $^{19}$ F in C $_{6}$ F $_{6}$ exhibits an extra resonance corresponding to the emergence of the states, by mechanically rotating a sample and a coil in nuclear magnetic resonance (NMR) measurements. On the basis of the Floquet formalism, we identify the emergence of the extra two-level state due to the temporal periodicity generated by the mechanical rotation (mechanical spin multiplexing) and derive an operator algebra analogous to the planar rotor algebra in an effective description of the system. The observed multiplexing allows a single spin 1/2 to carry more than two states and potentially enabling the processing of multiple quantum bits on a single spin.

論文

Massive Dirac magnons in the three-dimensional honeycomb magnetic oxide FeTiO

Chung, J.-H.*; Kwangwoo, S.*; Yokoo, Tetsuya R.; 植田大地*; 今井正樹; Kim, H.-S.; Kiem, D. H.; Han, M. J.*; 社本真一

Scientific Reports (Internet), 15, p.5978_1 - 5978_10, 2025/02

https://doi.org/10.1038/s41598-025-90478-2

被引用回数：0 パーセンタイル：0.00(Multidisciplinary Sciences)

Two dimensional honeycomb ferromagnets host massless Dirac magnons which are a bosonic analogue of Dirac fermions in graphene. The Dirac magnons may become massive and topological when the time-reversal symmetry breaks and an energy gap opens up at the Dirac point, which was experimentally observed in Cr $^{3+}$ -based van der Waals magnets. Here, we investigate the spin wave excitations in the magnetic oxide FeTiO with Fe $^{2+}$ electrons (). Using inelastic neutron scattering, we observe two magnon bands separated by a 1.2-meV gap at the Dirac points indicating that its Dirac magnons are massive. Using the linear spin-wave and density functional theory calculations, we find that the spin-orbit-coupled antisymmetric Dzyaloshinskii-Moriya exchanges can best account for the observed Dirac gap opening. The associated Berry curvature and Chern number () indicate that FeTiO hosts topological spin excitations via time-reversal symmetry breaking of Dirac magnons.

論文

Temperature-variable apparatus for measuring Barnett field

埋田真樹; 中堂博之; 今井正樹; 佐藤奈々; 齊藤英治

Review of Scientific Instruments, 94(6), p.063906_1 - 063906_8, 2023/06

https://doi.org/10.1063/5.0142318

被引用回数：2 パーセンタイル：27.04(Instruments & Instrumentation)

We have developed experimental equipment for observing the Barnett effect, in which mechanical rotation magnetizes an object, at low temperatures. A sample in a rotor is rotated bidirectionally using a temperature-controlled high-pressure gas. The stray field generated from the sample due to the Barnett effect was detected using a fluxgate magnetic sensor with a sensitivity on the order of several picoteslas, even at low temperatures. By replacing the rotor with a solenoid coil, the magnetic susceptibility of the sample was estimated from the stray field to be of the same order of magnitude as that due to the Barnett effect. The Barnett field was estimated using the dipole model. To assess the performance of the setup at low temperatures, measurements were performed on commercial magnetite (FeO) nanogranules. We confirmed the accordance of the factor between the experimental results using the present setup and those of our previous study performed at room temperature.

論文

Observation of the angular momentum compensation by Barnett effect and NMR

中堂博之; 今井正樹; 松尾衛; 前川禎通; 齊藤英治

Journal of the Physical Society of Japan, 90(8), p.081003_1 - 081003_11, 2021/08

https://doi.org/10.7566/JPSJ.90.081003

被引用回数：4 パーセンタイル：38.13(Physics, Multidisciplinary)

We demonstrate observation of the angular momentum compensation temperature $T_{rm A}$ , at which the net angular momentum is quenched in ferrimagnets. Using the Barnett effect, in which an object is magnetized by mechanical rotation owing to spin-rotation coupling, we measure $T_{rm A}$ in the Ho $_{3-x}$ Dy $_{x}$ Fe $_{5}$ O $_{12}$ system. We determine $T_{rm A}$ to be 240 K in Ho $_{3}$ Fe $_{5}$ O $_{12}$ (HoIG). We find that $T_{rm A}$ increases with Dy content and show that $T_{rm A}$ of Ho $_{1.5}$ Dy $_{1.5}$ Fe $_{5}$ O $_{12}$ corresponds with room temperature. We also demonstrate that $^{57}$ Fe-NMR measurements can be applied to explore domain wall dynamics in HoIG. We find that the NMR intensity exhibits a maximum at $T_{rm A}$ in the multi-domain state. We provide a simple model for describing this NMR signal enhancement caused by enhancement of domain-wall mobility at $T_{rm A}$ .

論文

角運動量物性としてのバーネット効果

中堂博之; 今井正樹

固体物理, 55(9), p.435 - 443, 2020/09

バーネット効果とは物体を回転させるとその物体が磁化するという1915年に発見された効果である。我々はここ10年間にわたって、スピントロニクスの文脈からこの効果を見直し、最先端のテクノロジーを用いてより高性能、高機能化した装置を用いて現代によみがえらせた。本レビューは装置開発当時から物体中の角運動量測定の成功に至るまでを、マル秘エピソードを交えてまとめたものである。

論文

Enhancement of domain-wall mobility detected by NMR at the angular momentum compensation temperature

今井正樹; 中堂博之; 松尾衛; 前川禎通; 齊藤英治

Physical Review B, 102(1), p.014407_1 - 014407_5, 2020/07

https://doi.org/10.1103/PhysRevB.102.014407

被引用回数：7 パーセンタイル：34.47(Materials Science, Multidisciplinary)

The angular momentum compensation temperature $T_{rm A}$ of ferrimagnets has attracted much attention because of high-speed magnetic dynamics near $T_{rm A}$ . We show that NMR can be used to investigate domain wall dynamics near $T_{rm A}$ in ferrimagnets. We performed $^{57}$ Fe-NMR measurements on the ferrimagnet HoFeO $_{12}$ with $T_{rm A}$ = 245 K. In a multi-domain state, the NMR signal is enhanced by domain wall motion. We found that the NMR signal enhancement shows a maximum at $T_{rm A}$ in the multi-domain state. The NMR signal enhancement occurs due to increasing domain-wall mobility toward $T_{rm A}$ . We develop the NMR signal enhancement model involves domain-wall mobility. Our study shows that NMR in multi-domain state is a powerful tool to determine $T_{rm A}$ , even from a powder sample and it expands the possibility of searching for angular momentum-compensated materials.

論文

Nature of structural instabilities in superconducting SrIrSn $_{13}$

金子耕士; Cheung, Y. W.*; Hu, Y.*; 今井正樹*; 谷奥泰明*; 金川響*; 村川譲一*; 森山広大*; Zhang, W.*; Lai, K. T.*; et al.

JPS Conference Proceedings (Internet), 30, p.011032_1 - 011032_6, 2020/03

https://doi.org/10.7566/JPSCP.30.011032

A quantum critical point appears as a second-order phase transition which takes place at zero temperature. In contrast to heavy-fermion systems in which magnetism often plays a vital role, recent studies revealed that structural instabilities can drive a system to a quantum critical point as well. In quasi-skutterudite (Ca,Sr)Sn $_{13}$ (=Rh, Ir), SrIrSn $_{13}$ exhibits superconductivity around $T_{rm sc}$ 5 K and a structural transition at $T^*{simeq}$ 147 K. Applying physical or chemical pressure on SrIrSn $_{13}$ suppresses rapidly, and a quasi-linear dependence of electrical resistivity, signature of non-Fermi liquid behavior, was observed where extrapolates to 0 K. The isomorphs (CaSr $_{1-x}$ )RhSn $_{13}$ exhibits similar behavior, where the criticality can be reached by 0.9 without external pressure. Neutron scattering experiments in SrIrSn $_{13}$ evidences the second order nature of the structural transition at by the observation of a continuous evolution of superlattice peak below and a gradual increase of critical scattering upon approaching to by cooling. Increase of in (CaSr $_{1-x}$ )RhSn $_{13}$ toward the quantum critical point leads to the systematic variation of the critical exponents of the order parameter. In addition, this substitution induces the phonon softening around the M point towards zero energy revealed by inelastic X-ray scattering experiment. We will present systematic variations in both elastic and inelastic channels upon approaching to the quantum critical point.

論文

Angular momentum compensation manipulation to room temperature of the ferrimagnet Ho $_{3-x}$ Dy $_{x}$ FeO $_{12}$ detected by the Barnett effect

今井正樹; 中堂博之; 小野正雄; 針井一哉; 松尾衛; 大沼悠一*; 前川禎通; 齊藤英治

Applied Physics Letters, 114(16), p.162402_1 - 162402_4, 2019/04

https://doi.org/10.1063/1.5095166

被引用回数：23 パーセンタイル：70.48(Physics, Applied)

We demonstrate that the angular momentum compensation temperature $T_{rm A}$ , at which the net angular momentum in the sample disappears, can be controlled in HoFeO $_{12}$ by partially substituting Dy for Ho. The $T_{rm A}$ can be detected using the Barnett effect, by which mechanical rotation magnetizes an object due to spin-rotation coupling. We found that $T_{rm A}$ increases with the Dy content and clarified that the $T_{rm A}$ of Ho $_{1.5}$ Dy $_{1.5}$ FeO $_{12}$ coincides with room temperature. The Barnett effect enables us to explore materials applicable to magnetic devices utilizing the angular momentum compensation only by rotating the powder sample at room temperature.

論文

Evidence of a structural quantum critical point in (CaSr $_{1-x}$ )RhSn $_{13}$ from a lattice dynamics study

Cheung, Y. W.*; Hu, Y. J.*; 今井正樹*; 谷奥泰明*; 金川響*; 村川譲一*; 森山広大*; Zhang, W.*; Lai, K. T.*; 吉村一良*; et al.

Physical Review B, 98(16), p.161103_1 - 161103_5, 2018/10

https://doi.org/10.1103/PhysRevB.98.161103

被引用回数：20 パーセンタイル：63.32(Materials Science, Multidisciplinary)

Approaching a quantum critical point has been an effective route to stabilize superconductivity. While the role of magnetic QCPs has been extensively discussed, similar exploration of a structural QCP is scarce. Using inelastic X-ray scattering, we examine the phonon spectrum of the nonmagnetic quasi-skutterudite (CaSr $_{1-x}$ )RhSn $_{13}$ , which represents a precious system to explore the interplay between structural instabilities and superconductivity by tuning the Ca concentration x. We unambiguously detect the softening of phonon modes around the M point on cooling towards the structural transition. Intriguingly, at x = 0:85, the soft mode energy squared at the M point extrapolates to zero at -5.7 K, providing the first compelling microscopic evidence of a structural QCP in (CaSr $_{1-x}$ )RhSn $_{13}$ . The enhanced phonon density-of-states at low energy provides the essential ingredient for realizing strong-coupling superconductivity near the structural QCP.

論文

Observation of gyromagnetic reversal

今井正樹; 緒方裕大*; 中堂博之; 小野正雄; 針井一哉; 松尾衛*; 大沼悠一*; 前川禎通; 齊藤英治

Applied Physics Letters, 113(5), p.052402_1 - 052402_3, 2018/07

https://doi.org/10.1063/1.5041464

被引用回数：22 パーセンタイル：66.33(Physics, Applied)

We report direct observation of gyromagnetic reversal, which is the sign change of gyromagnetic ratio in a ferrimagnet HoFeO $_{12}$ , by using the Barnett effect measurement technique at low temperatures. The Barnett effect is a phenomenon in which magnetization is induced by mechanical rotation through the coupling between rotation and total angular momentum of electrons. The magnetization of HoFeO $_{12}$ induced by mechanical rotation disappears at 135 K and 240 K. The temperatures correspond to the magnetization compensation temperature $T_{rm M}$ and the angular momentum compensation temperature $T_{rm A}$ , respectively. Between $T_{rm M}$ and $T_{rm A}$ , the magnetization flips over to be parallel against the angular momentum due to the sign change of gyromagnetic ratio. This study provides an unprecedented technique to explore the gyromagnetic properties.

論文

Second-order structural transition in (Ca $_{0.5}$ Sr $_{0.5}$ )RhSn $_{13}$

Cheung, Y. W.*; Hu, Y. J.*; Goh, S. K.*; 金子耕士; 筒井智嗣; Logg, P. W.*; Grosche, F. M.*; 金川響*; 谷奥泰明*; 今井正樹*; et al.

Journal of Physics; Conference Series, 807(3), p.032002_1 - 032002_4, 2017/04

BB2016-0329.pdf:0.86MB

https://doi.org/10.1088/1742-6596/807/3/032002

被引用回数：6 パーセンタイル：80.71(Physics, Condensed Matter)

(Ca $_{0.5}$ Sr $_{0.5}$ )RhSn $_{13}$ is a member of the substitution series (Ca $_{x}$ Sr $_{1-x}$ )RhSn $_{13}$ which has recently been argued to feature a structural quantum critical point at = 0.9. In the stoichiometric compound Sr $_{3}$ Rh $_{4}$ Sn $_{13}$ , the structural transition at 138 K has been shown to be a second-order phase transition. Moving towards xc, we examine the character of the structural transition in (Ca $_{0.5}$ Sr $_{0.5}$ )RhSn $_{13}$ (i.e. = 0.5, 55 K) using electrical resistivity, heat capacity and X-ray scattering. The absence of the thermal hysteresis in specific heat around , and the continuous evolution of the superlattice reflection detected by X-ray diffraction are consistent with the scenario that the structural transition associated with a modulation vector = (0.5, 0.5, 0) in (Ca $_{0.5}$ Sr $_{0.5}$ )RhSn $_{13}$ remains second-order on approaching the quantum critical point.

論文

NMR investigation of spin fluctuations in the itinerant-electron magnetic compound ${rm Sr}_{1-x}{rm Ca}_x{rm Co}_2{rm P}_2$

今井正樹; 道岡千城*; 植田浩明*; 吉村一良*

Physical Review B, 95(5), p.054417_1 - 054414_7, 2017/02

https://doi.org/10.1103/PhysRevB.95.054417

被引用回数：4 パーセンタイル：19.87(Materials Science, Multidisciplinary)

$^{31}$ P NMR測定を行い主に常磁性相 ${rm Sr}_{1-x}{rm Ca}_x{rm Co}_2{rm P}_2$ (00.5)の遍歴電子のメタ磁性転移とその磁気秩序相(0.71)を明らかにし、また周波数空間におけるスペクトル幅に対応するスピンゆらぎパラメータT0を見積もった。SrCo $_{2}$ P $_{2}$ は、層間P-P結合がない擬二次元的な潰れていない正方晶(ucT)格子であるが、CaCo $_{2}$ P $_{2}$ はP-P結合をあり3次元の的な潰れた正方晶(cT)格子の物質である。 $T_{0}$ の面内成分は、SrCo $_{2}$ P $_{2}$ の面外成分よりもはるかに大きい。が0から0.5に増加すると、 $T_{0}$ の面内成分は、メタ磁性遷移場に比例して減少する。反強磁性cT相(0.71)では、常磁性ucT相(00.5)における挙動とは異なり、 $T_{0}$ は一定であり、スピン変動は等方性を示す。これらの結果は、擬二次元的結晶構造に起因する面内スピン変動がこの系の磁気転移に重要な役割を果たすことを示している。

論文

Studies of high density baryon matter with high intensity heavy-ion beams at J-PARC

佐甲博之; 原田寛之; 坂口貴男*; 中條達也*; 江角晋一*; 郡司卓*; 長谷川勝一; Hwang, S.; 市川裕大; 今井憲一; et al.

Nuclear Physics A, 956, p.850 - 853, 2016/12

https://doi.org/10.1016/j.nuclphysa.2016.03.030

被引用回数：14 パーセンタイル：64.97(Physics, Nuclear)

We are designing a large acceptance heavy-ion spectrometer at J-PARC based on a Toroidal magnet to measure hadrons, lepton pairs, and event-by-event fluctuations. We are also designing a closed geometry spectrometer to measure hypernuclei to study weak decays and magnetic moments. In this presentation, the preliminary version of the designed acceleration scheme, as well as the spectrometers and their expected performance and physics results are presented.

論文

Second-order structural transition in the superconductor LaCoSn $_{13}$

Cheung, Y. W.*; Zhang, J. Z.*; Zhu, J. Y.*; Yu, W. C.*; Hu, Y. J.*; Wang, D. G.*; 大友優香*; 岩佐和晃*; 金子耕士; 今井正樹*; et al.

Physical Review B, 93(24), p.241112_1 - 241112_5, 2016/06

AA2016-0058.pdf:0.95MB

https://doi.org/10.1103/PhysRevB.93.241112

被引用回数：17 パーセンタイル：57.50(Materials Science, Multidisciplinary)

The quasi-skutterudite superconductor LaCoSn $_{13}$ undergoes a phase transition at $T^{*}$ = 152 K. By measuring the temperature dependence of heat capacity, electrical resistivity, and the superlattice reflection intensity using X-ray, we explore the character of the phase transition at $T^{*}$ . Our lattice dynamic calculations found imaginary phonon frequencies around the point, when the high temperature structure is used in the calculations, indicating that the structure is unstable at the zero temperature limit. The combined experimental and computational results establish that $T^{*}$ is associated with a second-order structural transition with = (0.5, 0.5, 0) (or the point). Further electronic band structure calculations reveal Fermi surface sheets with low-curvature segments, which allow us to draw qualitative comparison with both SrIrSn $_{13}$ and SrRhSn $_{13}$ in which similar physics has been discussed recently.

論文

Towards a novel laser-driven method of exotic nuclei extraction-acceleration for fundamental physics and technology

西内満美子*; 榊泰直*; Esirkepov, T. Zh.*; 西尾勝久; Pikuz, T. A.*; Faenov, A. Ya.*; Skobelev, I. Yu.*; Orlandi, R.; Pirozhkov, A. S.*; 匂坂明人*; et al.

Plasma Physics Reports, 42(4), p.327 - 337, 2016/04

https://doi.org/10.1134/S1063780X1604005X

被引用回数：13 パーセンタイル：54.81(Physics, Fluids & Plasmas)

ペタワットレーザーと原子核物理学の技術を組み合わせることで、エキゾチック原子核の性質の測定を決定的に可能にする。数値シミュレーションとレーザー駆動実験により、我々は論文、西内等、Phys. Plasmas 22, 033107 (2015)で提案された「レーザー駆動エキゾチック核抽出-加速法」の展望について紹介する。この方法の特徴は、(1)フェムト秒ペタワットレーザーを、外部イオンビームによって破砕された原子核標的に照射し、(2)そして生成された短寿命の重エキゾチック原子核を数GeVの多価電荷としてまとめて一気に加速する、という画期的な方法である。

論文

A Laser-plasma-produced soft X-ray laser at 89 eV generates DNA double-strand breaks in human cancer cells

佐藤克俊*; 錦野将元; 河内哲哉; 下川卓志*; 今井高志*; 手島昭樹*; 西村博明*; 神門正城

Journal of Radiation Research, 56(4), p.633 - 638, 2015/07

https://doi.org/10.1093/jrr/rrv015

被引用回数：2 パーセンタイル：11.21(Biology)

X線レーザーは、生物学,医学分野をはじめとする諸分野への応用研究が期待されているが、そのDNA損傷等の生物学的影響についての評価はまだ進んでいない。放射線生物学への応用研究の最初のステップとして軟X線レーザーマイクロビーム照射装置の開発を行った。軟X線レーザーによるDNA損傷生成についての研究を開始した。マイクロビーム照射装置については、軟X線集光素子を用いて培養細胞集団程度の大きさに集光を行い、マイクロメーターレベルの制御可能なステージを組み合わせてあり、大気中の培養細胞に照射可能である。本装置を用いて世界で初めて軟X線レーザーの照射によるがん細胞のDNA二本鎖切断の生成を確認した。

論文

Laser-driven multi-charged heavy ion beam acceleration

西内満美子; 榊泰直; Esirkepov, T. Z.; 西尾勝久; Pikuz, T. A.*; Faenov, A. Ya.*; Pirozhkov, A. S.; 匂坂明人; 小倉浩一; 金崎真聡; et al.

Research Using Extreme Light; Entering New Frontiers with Petawatt-Class Lasers II (Proceedings of SPIE, Vol.9515), p.95151D_1 - 95151D_4, 2015/06

https://doi.org/10.1117/12.2179204

被引用回数：0 パーセンタイル：0.00(Engineering, Electrical & Electronic)

超高強度短パルスレーザーと金属ターゲットとの相互作用による多価重イオン加速実験の結果を発表する。10J以下のレーザーエネルギー、36fsのパルス幅、10 $^{10}$ のコントラストを持つ200TWのJ-KARENレーザーシステムを用いた。ほぼ完全電離に近い鉄のイオンがトータルで0.9GeVのエネルギーにまで加速された。これは固体薄膜ターゲットと10 $^{21}$ Wcm $^{-2}$ のレーザーとの相互作用によってはじめて可能となったと考えられる。このように高いQ/Mを持つイオンは既存の重イオン加速器のイオン源においては、達成が難しい。

論文

Acceleration of highly charged GeV Fe ions from a low-Z substrate by intense femtosecond laser

西内満美子; 榊泰直; Esirkepov, T. Z.; 西尾勝久; Pikuz, T.*; Faenov, A.*; Skobelev, I. Yu.*; Orlandi, R.; 佐甲博之; Pirozhkov, A. S.; et al.

Physics of Plasmas, 22(3), p.033107_1 - 033107_8, 2015/03

https://doi.org/10.1063/1.4913434

被引用回数：75 パーセンタイル：96.14(Physics, Fluids & Plasmas)

200TWの超高強度レーザーパルスをミクロンメートルのアルミの薄膜に鉄の不純物を混ぜたターゲットに照射することで、ほぼフルストリップに近い鉄のイオンが0.9GeVで加速された。低エミッタンスで、重いイオンのビームが高いQ/Mで得られることは、いろいろな分野への応用が考えられ、例えば、既存加速器技術との融合によってコンパクトなRIイオン源の開発が考えられる。

論文

Overview of national centralized tokamak program; Mission, design and strategy to contribute ITER and DEMO

二宮博正; 秋場真人; 藤井常幸; 藤田隆明; 藤原正巳*; 濱松清隆; 林伸彦; 細金延幸; 池田佳隆; 井上信幸; et al.

Journal of the Korean Physical Society, 49, p.S428 - S432, 2006/12

現在検討が進められているJT-60のコイルを超伝導コイルに置き換える計画(トカマク国内重点化装置計画)の概要について述べる。本計画はITER及び原型炉への貢献を目指しているが、その位置づけ,目的,物理設計及び装置設計の概要,今後の計画等について示す。物理設計については、特に高い規格化ベータ値を実現するためのアスペクト比,形状因子及び臨界条件クラスのプラズマや完全非誘導電流駆動のパラメータ領域等について、装置については物理設計と整合した設計の概要について示す。

報告書

平成17年度平成21年度科学研究費補助金特別推進研究「4次元空間中性子探査装置の開発と酸化物高温超伝導機構の解明」平成17年度研究報告書

新井正敏; 横尾哲也*; 梶本亮一; 中島健次; 社本真一; 山田和芳*; 藤田全基*; 猪野隆*; 曽山和彦; 中村充孝; et al.

JAEA-Review 2006-033, 58 Pages, 2006/11

JAEA-Review-2006-033.pdf:17.22MB

平成17年度から平成21年度にわたり、「4次元空間中性子探査装置の開発と酸化物高温超伝導機構の解明」を研究課題とする科学研究費補助金・特別推進研究が採択された(研究代表者・新井正敏)。本研究は大強度陽子加速器(J-PARC)の大強度パルス中性子源において、現在世界最高性能の非弾性散乱実験装置よりも二桁高い性能を有する実験装置、4次元空間中性子探査装置(4SEASONS: 4d SpacE AccesS neutrON Spectrometer)を建設し、異常な磁気励起,フォノン異常現象を3次元の波数-エネルギーからなる4次元空間で詳細に観測することにより酸化物高温超伝導機構の解明を目指すものである。本報告書は本研究の平成17年度の研究成果をまとめたものである。