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論文

Ferrimagnetic structure in the high-pressure phase of $$alpha$$-Mn

荒木 新吾*; 岩本 凱成*; 秋葉 和人*; 小林 達生*; 宗像 孝司*; 金子 耕士; 長壁 豊隆

Physical Review B, 110(9), p.094420_1 - 094420_7, 2024/09

$$alpha$$-Mn相は、自発磁化が0.02$${mu}_{rm B}$$/Mnと比較的小さいにもかかわらず、圧力誘起弱強磁性(WFM)状態で大きな異常ホール効果(AHE)を示す。このAHEの背後にある根本的な機構を理解するために、2.0GPaの圧力下で単結晶中性子回折測定を行い、WFM相の磁気構造を決定した。I、II、III-1、IV-1位置のMnは、ほぼコリニアーな磁気モーメントが[001]方向に揃ったフェリ磁性構造を持つことを見出した。一方で、III-2とIV-2位置のMnの微小な磁気モーメントは(001)面内を向いている。この磁気構造で計算したネットの磁気モーメントの大きさ(-0.020$${pm}$$0.005)$${mu}_{rm B}$$/Mn原子)は、実験で決定された自発磁化と非常によく一致する。$$q$$ = (0, 0, 0)での磁気反射の観測は、AHEの出現の重要な条件を満たしている。

論文

Single helicity of the triple-$$q$$ triangular skyrmion lattice state in the cubic chiral helimagnet EuPtSi

松村 武*; 田端 千紘; 金子 耕士; 中尾 裕則*; 垣花 将司*; 辺土 正人*; 仲間 隆男*; 大貫 惇睦*

Physical Review B, 109(17), p.174437_1 - 174437_8, 2024/05

We investigated the magnetic helicity of the triple-$$q$$ magnetic structure of the triangular skyrmion lattice in the A-phase of EuPtSi for a magnetic field along the [111] axis by resonant X-ray diffraction using a circularly polarized beam. We show that all three Fourier components of the triple-$$q$$ structure are perpendicular to the respective $$q$$ vectors and have the same helicity. They are connected by the rotation operations about the [111] axis. The helicity is the same as that of the single-$$q$$ helimagnetic phase at low fields, suggesting that the antisymmetric exchange interaction inherent in the chiral structure supports the formation of the triangular skyrmion lattice. We also observe that the helical plane in the helimagnetic phase is tilted to the magnetic field to form a conical structure before the first-order transition to the skyrmion lattice phase.

論文

Magnetic order in honeycomb layered U$$_2$$Pt$$_6$$Ga$$_{15}$$ studied by resonant X-ray and neutron scattering

田端 千紘; 今 布咲子*; 太田 玖吾*; 日比野 瑠央*; 松本 裕司*; 網塚 浩*; 中尾 裕則*; 芳賀 芳範; 金子 耕士

Physical Review B, 109(13), p.134403_1 - 134403_7, 2024/04

Antiferromagnetic (AF) order of U$$_2$$Pt$$_6$$Ga$$_{15}$$ with the ordering temperature $$T$$$$_{rm N}$$ = 26 K was investigated by resonant X-ray scattering and neutron diffraction on single crystals. This compound possesses a unique crystal structure in which uranium ions form honeycomb layers and then stacks along the c-axis with slight offset, which gives rise to a stacking disorder. The AF order can be described with the propagation vector of q = (1/6, 1/6, 0) in the hexagonal notation. The ordered magnetic moments orient perpendicular to the honeycomb layers, indicating a collinear spin structure consistent with Ising-like anisotropy. The magnetic reflections are found to be broadened along c$$^{*}$$ indicating that the stacking disorder results in anisotropic correlation lengths. The semiquantitative analysis of neutron diffraction intensity, combined with group theory considerations based on the crystallographic symmetry, suggests a zig-zag type magnetic structure for the AF ground state, in which the AF coupling runs perpendicular to the stacking offset, characterized as q = (1, 0, 0). The realization of the zig-zag magnetic structure implies the presence of frustrating intralayer exchange interactions involving both ferromagnetic (FM) first-neighbor and AF second and third-neighbor interactions in this compound.

論文

New standard for low temperature sample environment at JAEA/JRR-3

金子 耕士; 田端 千紘; 萩原 雅人; 山内 宏樹; 大場 洋次郎; 熊田 高之; 久保田 正人; 児島 佑樹*; 生田目 望; 佐々木 未来; et al.

JPS Conference Proceedings (Internet), 41, p.011015_1 - 011015_6, 2024/03

We will introduce our recent update on low temperature system for neutron diffraction experiments. This is characterized by advantages such as liquid He free and sophisticated automatic temperature control functions, which can be a new standard for low temperature and high magnetic field experiments of neutron scattering.

論文

Neutron scattering study of antiferromagnet U$$_{2}$$Pt$$_{6}$$Al$$_{15}$$

太田 玖吾*; 松本 裕司*; 渡部 悠貴*; 金子 耕士; 田端 千紘; 芳賀 芳範

New Physics; Sae Mulli, 73(12), p.1170 - 1173, 2023/12

ハニカム格子を持つ反強磁性体U$$_{2}$$Pt$$_{6}$$Al$$_{15}$$の磁気構造を決定するために中性子散乱実験を行った。U$$_{2}$$Pt$$_{6}$$Al$$_{15}$$$$T_{rm m1}$$=9Kと$$T_{rm m2}$$=26Kで二つの相転移を示す。$$T_{rm m1}$$ $$<$$ $$T$$ $$<$$ $$T_{rm m2}$$の第一相では、$$kappa$$$$_{rm I}$$=(1/3, 0, 0)の伝搬ベクトルで記述される磁気反射が観測された。$$T$$$$<$$$$T_{rm m1}$$のフェーズIIでは、$$kappa$$$$_{rm I}$$=(1/3, 0, 0)と$$kappa$$$$_{rm II}$$=(1/2, 0, 0)の磁気反射が観測され、$$kappa$$$$_{rm I}$$=(1/3, 0, 0)の磁気反射強度は弱いが有限であった。温度依存強度のヒステリシスは$$T_{rm m1}$$での相転移にまたがって観測され、$$T_{rm m1}$$での転移が1次転移であることを示唆している。

論文

Field-tuned quantum renormalization of spin dynamics in the honeycomb lattice Heisenberg antiferromagnet YbCl$$_3$$

Sala, G.*; Stone, M. B.*; Hal$'a$sz, G. B.*; Lumsden, M. D.*; Fay, A, F,*; Pajerowski, D. M.*; 河村 聖子; 金子 耕士; Mazzone, D. G.*; Simutis, G.*; et al.

Communications Physics (Internet), 6, p.234_1 - 234_7, 2023/08

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

We demonstrate and elucidate quantum effects on the honeycomb lattice through comprehensive inelastic neutron scattering measurements of the prototype honeycomb lattice quantum magnet YbCl$$_{3}$$ as a function of applied magnetic field. Examining the spectrum above the saturation field where linear spin-wave theory is essentially exact, we accurately determine the dominant nearest-neighbor Heisenberg interaction. Below the saturation field, we reveal a field-dependent energy renormalization of the entire magnetic spectrum; the sharp spin-wave modes as well as the multimagnon continuum. This renormalization is a quantum effect that can be accurately captured by the first 1=S correction in nonlinear spin-wave theory. Furthermore, we find that the application of a magnetic field induces a qualitatively new sharp feature inside the multimagnon continuum; the lower edge of a specific two-magnon component; which is complementary to the previously observed Van Hove singularity and demonstrates that structures within the multimagnon continuum can occur over a wide experimental parameter space and can be used as an additional means of identifying quantum phenomena.

論文

Effect of starch retrogradation on molecular dynamics of cooked rice by quasi-elastic neutron scattering

平田 芳信*; 中川 洋; 山内 宏樹; 金子 耕士; 萩原 雅人; 山口 秀幸*; 大元 智絵*; 勝野 那嘉子*; 今泉 鉄平*; 西津 貴久*

Food Hydrocolloids, 141, p.108728_1 - 108728_7, 2023/08

 被引用回数:2 パーセンタイル:66.25(Chemistry, Applied)

結晶化度は食品や材料の機械的性質に反映される。結晶化度は澱粉の構造ダイナミクスと関係しているはずである。本研究では、中性子準弾性散乱(QENS)を用いて、炊飯澱粉の老化に伴う分子ダイナミクスの変化を調べた。測定されたQENSの幅は老化に伴い狭くなった。また、弾性非干渉散乱構造因子(EISF)は増加し、老化現象に伴い分子ダイナミクスが空間的に抑制されることが示された。低移動度と高移動度をそれぞれ結晶相と非晶質相に対応させた2値分布の連続拡散モデルを用いてEISFを解析したところ、低移動度成分の割合が老化によって増加することが示された。

論文

Incommensurate nature of the antiferromagnetic order in GdCu$$_2$$

金子 耕士; 田端 千紘; 萩原 雅人; 山内 宏樹; 久保田 正人; 長壁 豊隆; 大貫 惇睦*

Journal of the Physical Society of Japan, 92(8), p.085001_1 - 085001_2, 2023/08

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

A magnetic order in orthorhombic GdCu$$_2$$ was investigated by a single crystal neutron diffraction with thermal neutron. Magnetic peaks were observed at incommensurate positions described by the ordering vector $$q$$=($${delta}$$~1~0) with $${delta}$$=0.678 at 4~K. This ordering vector is close to the commensurate one with $$q_c$$=(2/3~1~0) reported earlier, but clearly deviates. The incommensurate nature of the magnetic order in GdCu$$_2$$ is further corroborated by the peak shift with temperature below $$T_{rm N}$$.

論文

Neutron resonance absorption imaging of simulated high-level radioactive waste in borosilicate glass

大場 洋次郎; 元川 竜平; 金子 耕士; 永井 崇之; 土川 雄介; 篠原 武尚; Parker, J. D.*; 岡本 芳浩

Scientific Reports (Internet), 13, p.10071_1 - 10071_8, 2023/06

 被引用回数:1 パーセンタイル:63.33(Multidisciplinary Sciences)

The spatial distribution of constituent elements in borosilicate glasses containing simulated high-level radioactive liquid waste (HLLW) was investigated using neutron resonance absorption imaging. The resonance absorption dips of Rh, Pd, Na, Gd, Cs, and Sm were detected in the neutron transmission spectra of the glass samples. The neutron transmission images at the resonance energies of these elements provided the spatial distributions within the glass samples. Rh and Pd led sedimentation, while Gd, Sm, and Cs were uniformly dispersed. These results clearly show the potential of neutron resonance absorption imaging for characterizing borosilicate glasses.

論文

A Phoswich alpha/beta detector for monitoring in the site of Fukushima Daiichi Nuclear Power Station

森下 祐樹; 高崎 浩司; 北山 佳治; 田川 明広; 柴田 卓弥; 星 勝也; 金子 純一*; 樋口 幹雄*; 大浦 正利*

Radiation Measurements, 160, p.106896_1 - 106896_10, 2023/01

 被引用回数:0 パーセンタイル:0.01(Nuclear Science & Technology)

福島第一原子力発電所のアルファおよびベータ汚染をリアルタイム弁別測定するためのPhoswichアルファ/ベータ検出器を開発した。検出器は、アルファ線とベータ線を検出する2層のシンチレータ(プラスチックシンチレータ及びGPSシンチレータ)で構成した。パルス波形弁別(PSD)法を使用して、高ベータ線および高ガンマ線環境でアルファ線をリアルタイムを弁別測定できた。さらに、この検出器は、最大9.0mSv/hのバックグラウンド線量下でアルファ線を識別することができた。

論文

Phonon softening in Lu(Pt$$_{1-x}$$Pd$$_x$$)$$_2$$In close to a zero-temperature structural instability

Gruner, T.*; Lucas, S.*; Geibel, C.*; 金子 耕士; 筒井 智嗣*; Schmalzl, K.*; Stockert, O.*

Physical Review B, 106(11), p.115142_1 - 115142_6, 2022/09

 被引用回数:1 パーセンタイル:14.73(Materials Science, Multidisciplinary)

The disappearance of a charge-density-wave (CDW) transition in Lu(Pt$$_{1-x}$$Pd$$_x$$)$$_2$$In is thought to be closely linked to a maximum of the superconducting transition temperature in the system. We studied the superstructure and the phonon softening in Lu(Pt$$_{0.5}$$Pd$$_{0.5}$$)$$_2$$In by means of neutron and high-resolution inelastic X-ray scattering. A full phonon softening at $$q_{textrm{CDW}}$$ = (0.5, 0.5, 0) with the appearance of superstructure peaks could be clearly identified. The large tail of the superstructure intensity above the CDW transition indicates the importance of critical fluctuations.

論文

Two-step Mott transition in Ni(S,Se)$$_2$$; $$mu$$SR studies and charge-spin percolation model

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 NiS$$_{2-x}$$Se$$_x$$ 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 $$xsim$$0.45 followed by the AFM to paramagnetic metal (PMM) transition at $$xsim$$1.0. Among a few other Mott systems which exhibit similar two-step transitions, Ni(S,Se)$$_2$$ 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.

論文

Gaps in topological magnon spectra; Intrinsic versus extrinsic effects

Do, S.-H.*; Paddison, J. A. M.*; Sala, G.*; Williams, T. J.*; 金子 耕士; 桑原 慶太郎*; May, A. F.*; Yan, J.*; McGuire, M. A.*; Stone, M. B.*; et al.

Physical Review B, 106(6), p.L060408_1 - L060408_6, 2022/08

 被引用回数:10 パーセンタイル:83.21(Materials Science, Multidisciplinary)

For topological magnon spectra, determining and explaining the presence or absence of a gap at a magnon crossing point is a central issue. An inelastic neutron scattering study of a single crystals is a powerful experimental technique to investigate the spin dynamics and hence is widely employed to probe the magnetic excitation spectra of topological materials. However, when the neutron intensity rapidly disperses, such as near a crossing point for a Dirac magnon, the apparent spectrum is extremely sensitive to experimental conditions including sample mosaic, resolution, and integration range. Here we study a gapless Dirac magnon candidate CrCl$$_{3}$$ to show how the quantification of a gapless or gaped spectrum at the Dirac point is extremely sensitive to the integration range of data. Our work calls for a careful examination of reports of gaps in inelastic neutron scattering spectra to ensure that topological gaps are not misdiagnosed or overestimated due to experimental factors.

論文

Cycloidal magnetic ordering in noncentrosymmetric EuIrGe$$_3$$

松村 武*; 塚越 舜*; 上田 祥央*; 比嘉 野乃花*; 中尾 朗子*; 金子 耕士; 垣花 将司*; 辺土 正人*; 仲間 隆男*; 大貫 惇睦*

Journal of the Physical Society of Japan, 91(7), p.073703_1 - 073703_5, 2022/07

 被引用回数:6 パーセンタイル:74.91(Physics, Multidisciplinary)

Successive magnetic phase transitions in EuIrGe$$_3$$, an intermetallic compound with a body centered tetragonal lattice belonging to a polar space group I4mm, has been investigated by neutron diffraction and resonant X-ray diffraction. It is shown that EuIrGe$$_3$$ exhibits an incommensurate longitudinal sinusoidalorder with $$q{sim}$$ (0, 0, 0.792) and m$$_q{parallel}$$ c-axis in the high temperature phase, which changes to a cycloidal order with $$q$$ = ($${delta}'$$, 0, 0.8) ($${delta}'{sim}$$ 0.017) and m$$_q{parallel}$$ ac-plane in the intermediate phase. In the low temperature phase, the cycloidal plane rotates by 45$$^{circ}$$ to have $$q$$=($${delta}, {delta}$$, 0.8) ($${delta}{sim}$$0.012). It is also pointed out that the X-ray scattering amplitude from odd-parity magnetic quadrupole due to the polar environment interfere with that from normal even-parity magnetic dipole in the magnetic ordered phase.

論文

Damped Dirac magnon in the metallic kagome antiferromagnet FeSn

Do, S.-H.*; 金子 耕士; 梶本 亮一; 蒲沢 和也*; Stone, M. B.*; Lin, J. Y. Y.*; 伊藤 晋一*; 益田 隆嗣*; Samolyuk, G. D.*; Dagotto, E.*; et al.

Physical Review B, 105(18), p.L180403_1 - L180403_6, 2022/05

 被引用回数:14 パーセンタイル:89.42(Materials Science, Multidisciplinary)

We report inelastic neutron scattering studies of the prototypical kagome magnetic metal FeSn. The spectra display well defined spin waves extending up to 120 meV. Above this energy, the spin waves become progressively broadened, reflecting interactions with the Stoner continuum. Using linear spin wave theory, we determine an effective spin Hamiltonian that explains the measured dispersion. This analysis indicates that the Dirac magnon at the K point occurs on the brink of a region where well defined spin waves become unobservable. Our results emphasize the influential role of itinerant carriers on the topological spin excitations of metallic kagome magnets.

論文

Square and rhombic lattices of magnetic skyrmions in a centrosymmetric binary compound

高木 里奈*; 松山 直文*; Ukleev, V.*; Yu, L.*; White, J. S.*; Francoual, S.*; Mardegan, J. R. L.*; 速水 賢*; 齋藤 開*; 金子 耕士; et al.

Nature Communications (Internet), 13, p.1472_1 - 1472_7, 2022/03

 被引用回数:58 パーセンタイル:99.55(Multidisciplinary Sciences)

Magnetic skyrmions are topologically stable swirling spin textures with particle-like character, and have been intensively studied as a candidate of high-density information bit. While magnetic skyrmions were originally discovered in noncentrosymmetric systems, recently a nanometric skyrmion lattice has also been reported for centrosymmetric rare-earth compounds. For the latter systems, a novel skyrmion formation mechanism mediated by itinerant electrons has been proposed, and the search of a simpler model system allowing for a better understanding of their intricate magnetic phase diagram is highly demanded. Here, we report the discovery of square and rhombic lattices of nanometric skyrmions in a centrosymmetric binary compound EuAl$$_4$$, by performing small-angle neutron and resonant elastic X-ray scattering experiments. Unlike previously reported centrosymmetric skyrmion-hosting materials, EuAl$$_4$$ shows multiple-step reorientation of the fundamental magnetic modulation vector as a function of magnetic field, probably reflecting a delicate balance of associated itinerant-electron-mediated interactions. The present results demonstrate that a variety of distinctive skyrmion orders can be derived even in a simple centrosymmetric binary compound, which highlights rare-earth intermetallic systems as a promising platform to realize/control the competition of multiple topological magnetic phases in a single material.

論文

Nanoscopic structure of borosilicate glass with additives for nuclear waste vitrification

元川 竜平; 金子 耕士; 大場 洋次郎; 永井 崇之; 岡本 芳浩; 小林 大志*; 熊田 高之; Heller, W. T.*

Journal of Non-Crystalline Solids, 578, p.121352_1 - 121352_7, 2022/02

 被引用回数:3 パーセンタイル:21.48(Materials Science, Ceramics)

We investigated the nanoscopic structure of borosilicate glasses as a host for high-level radioactive liquid waste (HLLW) in the presence of the additives Na$$_{2}$$O and CaO/ZnO with and without Li$$_{2}$$O. These additives have been practically used to lower the glass melting point, suppress the macroscopic phase separation, and increase the chemical durability of glasses. Small-angle neutron scattering was used to elucidate the effect of the additives on the nanoscopic structure along with macro- and atomic-scale observations obtained using neutron imaging and X-ray diffraction, respectively. The borosilicate glass formed a microphase-separated structure of SiO$$_{2}$$- and B$$_{2}$$O$$_{3}$$-rich domains approximately 100 nm in size in the absence of Na$$_{2}$$O, even in a structure homogeneous on a millimeter scale, and the domain spacing decreased with increasing Na$$_{2}$$O content rate. The CaO/ZnO additives induced inhomogeneities, such as void structures several nanometers in size, although the inhomogeneity was suppressed by the coaddition of Li$$_{2}$$O. These results provide insights into the performance of host glasses for HLLW vitrification; incorporating HLLW into glasses is likely to cause changes in the nanoscopic structure of host glasses similar to those revealed here.

論文

Feedback of superconductivity on the magnetic excitation spectrum of UTe$$_{2}$$

Raymond, S.*; Knafo, W.*; Knebel, G.*; 金子 耕士; Brison, J.-P.*; Flouquet, J.*; 青木 大*; Lapertot, G.*

Journal of the Physical Society of Japan, 90(11), p.113706_1 - 113706_5, 2021/11

 被引用回数:13 パーセンタイル:79.65(Physics, Multidisciplinary)

We investigate the spin dynamics in the superconducting phase of UTe$$_2$$ by triple-axis inelastic neutron scattering on a single crystal sample. At the wave-vector $$k_1$$ = (0, 0.57, 0), where the normal state antiferromagnetic correlations are peaked, a modification of the excitation spectrum is evidenced, on crossing the superconducting transition, with a reduction of the relaxation rate together with the development of an inelastic peak at $${Omega} approx$$ 1 meV. The low dimensional nature and the a-axis polarization of the fluctuations, that characterise the normal state, are essentially maintained below Tsc. The high ratio of $${Omega}$$ $$k_{rm B}$$$$T$$$$_{sc}$$ $$approx$$ 7.2 contrasts with the most common behaviour in heavy fermion superconductors.

論文

Lattice dynamics in CePd$$_2$$Al$$_2$$ and LaPd$$_2$$Al$$_2$$

Dole$v{z}$al, P.*; Cejpek, P.*; 筒井 智嗣*; 金子 耕士; Legut, D.*; Carva, K.*; Javorsk$'y$, P.*

Scientific Reports (Internet), 11(1), p.20878_1 - 20878_10, 2021/10

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

The interaction between phonons and 4f electrons, which is forming a new quantum state (quasi-bound state) beyond Born-Oppenheimer approximation, is very prominent and lattice dynamics plays here a key role. There is only a small number of compounds in which the experimental observation suggest such a scenario. One of these compounds is CePd$$_2$$Al$$_2$$. The inelastic X-ray scattering technique was used for mapping the phonon modes at X and Z points as well as in L and D directions, where the symmetry analysis of phonon modes was performed. The measured spectra are compared with the theoretical calculation, showing very good agreement. The results are discussed with respect to the magneto-elastic interaction. The phonon mode symmetry A1g was found to be unaffected by the interaction, which is in contrast to previous assumptions.

論文

Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder compound UTe$$_{2}$$

Knafo, W.*; Knebel, G.*; Steffens, P.*; 金子 耕士; Rosuel, A.*; Brison, J.-P.*; Flouquet, J.*; 青木 大*; Lapertot, G.*; Raymond, S.*

Physical Review B, 104(10), p.L100409_1 - L100409_6, 2021/09

 被引用回数:38 パーセンタイル:94.52(Materials Science, Multidisciplinary)

Inelastic-neutron-scattering measurements were performed on a single crystal of the heavy-fermion paramagnet UTe$$_{2}$$ above its superconducting temperature. We confirm the presence of antiferromagnetic fluctuations with the incommensurate wave-vector $${bf K}_{1}$$ = (0, 0.57, 0). A quasielastic signal is found, whose momentum-transfer dependence is compatible with fluctuations of magnetic moments $$mu$$ $$||$$ ${bf a}$, with a sine-wave modulation of wave-vector $${bf K}_{1}$$ and in-phase moments on the nearest U atoms. Low dimensionality of the magnetic fluctuations, consequence of the ladder structure, is indicated by weak correlations along the direction ${bf c}$. These results constitute constraints for models of magnetically-mediated superconductivity in UTe$$_{2}$$.

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