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Zhang, Y.*; 丸澤 賢人*; 工藤 航平*; 諸岡 聡; Gong, W.; Harjo, S.; 宮本 吾郎*; 古原 忠*
Journal of Materials Science & Technology, 275, p.250 - 259, 2026/12
This study examines how substitutional alloying elements (Mn, Cr, Al, and Si) influence low-temperature tempering reactions in high carbon martensitic steels. Through comprehensive experimental techniques including 
neutron diffraction et al., the work clarifies how alloying modifies tempering kinetics by affecting carbon diffusion and phase nucleation. Al and Cr strongly suppress martensite tetragonality reduction and carbon redistribution, while retained austenite decomposes in two stages that are selectively delayed by different alloying elements. Overall, the tempering sequence and kinetics are shown to be governed by alloying-dependent control of carbon mobility and phase transformations.
弘中 浩太; 小泉 光生; 持丸 貴則*; 高橋 時音; 山西 弘城*; 若林 源一郎*
Nuclear Instruments and Methods in Physics Research A, 1090, p.171675_1 - 171675_7, 2026/10
Directional fast neutron detection is critical for efficient neutron source surveys in nuclear security applications. In this study, we investigate detector geometries and measurement strategies that enable neutron source localization using plastic scintillation detectors without neutron moderation. Two detector configurations were developed: a rod-shaped scintillator equipped with photomultiplier tubes (PMTs) at both ends and a plate-shaped scintillator instrumented with four PMTs at its corners. Angular response measurements to incident neutrons and rectilinear scanning measurements relative to a neutron source were performed. Both detectors exhibited clear angular dependence in neutron count rates attributable to detector geometry. Rectilinear scanning measurements enabled identification of the point of closest approach to the source along the scan path and estimation of the source--detector distance. For the plate-shaped detector, analysis of relative PMT signal strengths provided additional directional information, enabling three-dimensional localization of the neutron source using a single detector. These results demonstrate that plastic scintillation detectors, when combined with appropriate geometries and scanning strategies, can achieve neutron source localization --- which is a key capability for mobile neutron source survey applications.
Shi, W.*; 町田 昌彦; 岡本 孝司*; Luo, X.*; Feng, W.*; Liu, X.*
Reliability Engineering & System Safety, 272, Part1, p.112538_1 - 112538_18, 2026/08
深刻な原子力事故時における緊急対応の信頼性は、放射性線源分布をリアルタイムで確実に監視できるかどうかに大きく依存する。しかし、この安全機能は、監視の死角を生じさせる物理的制約や動的な放出を追跡するには静的手法が不十分であるという問題によって大きく制約されている。本研究では、線源推定の信頼性およびロバスト性を向上させるため、時間正則化を導入したLASSO回帰に基づく動的再構成フレームワークを提案する。具体的には、スライディングウィンドウ型の時間ペナルティ機構を導入し、時間ステップ間の線源変化に対して
ノルム制約を課すことで、物理的連続性を確保する。また、放射線遮蔽や時間的に変動する強度によるバイアスを補正するため、寄与行列および測定ベクトルを正規化した。検証には、内部遮蔽を有する二室モデルを用い、PHITS(モンテカルロシミュレーション)を用いて実施した結果、遠隔測定データから動的線源を高精度に再構成できることが示された。時間正則化は、空間エイリアシングを抑制し、状況認識能力を向上させる。スライディングウィンドウ幅
(正則化なし)の場合、ホットスポット位置は大きく変動し、平均絶対誤差の変動量は約
であった。一方、
では空間的一貫性が改善され、誤差変動量は
程度まで低減した。比較解析の結果、精度と計算コストのバランスの観点から
が最適であることが示された。本研究は、困難な条件下においても線源位置および強度を高精度で追跡可能とする、動的ハザード評価のためのより信頼性の高い手法を提示するものである。提案手法は、原子力施設における緊急時管理のレジリエンスと安全性を向上させる意思決定支援ツールとしての活用が期待される。
阿部 拓海; 鈴木 大河*; 岡村 知拓*; 中瀬 正彦*
Annals of Nuclear Energy, 232, p.112224_1 - 112224_7, 2026/07
被引用回数：0 パーセンタイル：0.00Reprocessed uranium is important for sustainable nuclear fuel use. It contains isotopes such as U-232, U-234, and U-236, which influence enrichment and later nuclear fuel cycle steps. To evaluate these effects, nuclear fuel cycle simulators require cascade models capable of handling multi-isotopic uranium. In this study, an ideal cascade model based on the matched abundance ratio cascade was implemented in a nuclear fuel cycle simulator NMB4, developed by the Institute of Science Tokyo and Japan Atomic Energy Agency. A three-component approximation was introduced to simplify calculations. Validation against numerical solutions and experimental data showed good agreement. Compared with the simple coefficient method, the ideal cascade model improved predictions for isotopes such as U-232 and U-236, which affect radiation, separative work, and actinide production. These results demonstrate that the new model enhances the accuracy of reprocessed uranium evaluation, aiding future fuel cycle planning.
Sun, R.; 阿部 有希子; 安藤 麻里子; 小嵐 淳
Soil Biology & Biochemistry, 218, p.110150_1 - 110150_12, 2026/07
鉱物は壌炭素貯留において重要な役割を果たしているが、鉱物と土壌有機炭素の結合が(mineral-associated organic matter; MAOM)が微生物分解に抵抗する機構は解明されていない。本研究では、非晶質アロフェンと結晶性カオリナイトに土壌有機物の代表的な分子を吸着させ、熱力学解析および表面解析によりその親和性(結合強度)を定量するとともに、好気培養を用いて微生物分解対抗性を評価した。その結果、非晶質アロフェンは比表面積が大きいことに起因して多いOM吸着能を示した一方で、結晶性カオリナイトは内圏錯体によりOMと強く結合するMAOMになったことが分かった。さらに、ラングミュア親和定数(KL)が高い条件ほどMAOMの鉱化率は低下し、この逆相関は、鉱物に吸着したOM量(Qe)との相関よりも顕著であった。これらの知見は、MAOMの炭素貯留動態が吸着容量と結合強度のバランスによって制御されることを示唆する。すなわち、結合強度が高いほどMAOMの微生物抵抗性は増強され、他方で鉱物表面吸着サイトの豊かさが微生物に得られるMAOM量を規定する。本研究は、MAOM循環を規定する化学的相互作用の重要性を強調するとともに、MAOMの長期間持続性に疑義を問い直す。
相馬 康孝; 小松 篤史; 五十嵐 誉廣
Corrosion Science, 265, p.113182_1 - 113182_13, 2026/06
This study investigates the ion enrichment behavior inside stainless steel crevices in a very dilute solution (water containing 10~ppb Cl
), under conditions where no localized corrosion occurred. In~situ measurements of the crevice potential (
) and solution conductivity (
) were performed and analyzed using a finite element model. In crevices with sufficiently large depth-to-gap ratios (
), an initial decrease in increased the potential difference between the crevice interior and the external surface (
), thereby promoting an increase in due to chloride accumulation. At later stages, increased owing to a decrease in pH and a reduction in the IR drop, causing to peak and subsequently decrease. Larger ratios resulted in lower and higher . For the largest condition investigated (
~mm, 
m), and reached 0.218~V and 195.3~
S
cm
, respectively, after 
~s, corresponding to an estimated chloride enrichment factor exceeding 
. These results indicate that a driving force for chloride enrichment can be sustained for long durations even in passive crevices.
宮崎 加奈子*; 笛田 和希*; 門脇 正尚; 寺田 宏明; 香西 直文; 岩田 孟; 堀江 憲路*; 竹原 真美*; 山崎 信哉*; Grambow, B.*; et al.
Journal of Hazardous Materials, 511, p.142180_1 - 142180_17, 2026/06
Radioactive cesium-rich microparticles (CsMPs) released from the Fukushima Daiichi Nuclear Power Plant (FDNPP) in 2011 pose a persistent environmental concern, yet their initial atmospheric dispersion has remained poorly constrained. To elucidate their release dynamics, we quantified CsMPs in 100 surface soil samples collected across Fukushima Prefecture in July 2011. CsMP abundance and radioactive fraction (RF) ranged from 0 to 52,300 particles kg; (dry weight) and 0-61.85% of deposited 
Cs, respectively. Integrating these results with WSPEEDI atmospheric simulations reveals a major formation event of CsMPs around 03:00 JST on 15th March 2011. The plume emitted at this time was heavily enriched in CsMPs, whereas plumes released after 00:00 JST on 16th March 2011 contained no detectable CsMPs, indicating that particle formation had ceased by then. The widespread distribution of CsMPs across Fukushima Prefecture is therefore attributed primarily to this single plume on 15th March 2011. Directional differences in CsMP abundance reflect temporal variations in CsMP density within the plume, with maximum estimated concentrations of 2,070 particles m
; toward the southwest and 4,700 particles m; toward the northwest. Additionally, elevated CsMP densities coupled with relatively low RF in the northwest suggest supplementary deposition of water-soluble cesium between 17:00 and 23:00 JST on 15 March. These findings constrain the timing and mechanisms of CsMP formation and dispersion, providing essential insights for environmental reconstruction and future radiological risk assessment.
中瀬 正彦*; 中沢 亮太*; 三島 理愛
Next Chemical Engineering (Internet), 2, p.100051_1 - 100051_14, 2026/06
The separation of Platinum Group Metals (PGMs) is critical across various fields, including industrial metal recovery and nuclear waste management. This study rigorously examines the separation mechanisms of PGMs using Aluminum Hexacyanoferrate (AlHCF) by employing some analytical techniques. The mechanism involves not only simple adsorption but also the dissolution of AlHCF, leading to PGM ion precipitation and elution of components, as well as adsorption onto the AlHCF surface. We conducted X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS), X-ray absorption fine structure (XAFS), and pair distribution function (PDF) to thoroughly investigate the structural and chemical changes in AlHCF and FeHCF before and after PGM adsorption. Our findings reveal that Pd
ions replace Fe in AlHCF, preserving the ferrocyanide framework and the adsorption of Ru and Rh. In contrast, Ru and Rh adsorption results in broadened XRD pattern without initial AlHCF structure, suggesting the formation of amorphous precipitates through complexation with dissolved ions. By detailing these mechanisms, this study highlights the efficacy of AlHCF as a PGM separation agent and offers valuable insights for the improvement of useful metal recovery processes.
古田 琢哉; 橋本 慎太郎; 小川 達彦; 谷村 嘉彦
Nuclear Instruments and Methods in Physics Research A, 1086, p.171320_1 - 171320_8, 2026/06
被引用回数：0 パーセンタイル：0.00(Instruments & Instrumentation)物質に対する中性子照射から荷電粒子が放出される反応において、放出粒子と特定の励起状態にある残留核を同時に扱う核データライブラリを組み込むための新機能を、モンテカルロシミュレーションコードである 粒子・重イオン輸送計算コードPHITSに実装した。本機能により、残留核の生成および脱励起ガンマ線の放出を考慮しつつ、各事象における全エネルギーおよび運動量保存を満たした上で、核データライブラリに基づく放出粒子のエネルギースペクトルおよび角度分布の高精度な予測が可能となる。この機能を用いることで、検出器応答や材料中の放射線損傷の高精度シミュレーションが実施できる。
福田 航大; 小原 徹*
Nuclear Technology, 212(6), p.1567 - 1578, 2026/06
被引用回数：0 パーセンタイル：0.00(Nuclear Science & Technology)Offshore floating nuclear power plants (OFNPs) are gaining attention as safe and location-flexible means for nuclear energy utilization. Although platform motion in the marine environment may affect reactor kinetics, particularly in boiling water reactors (BWRs), BWR-type OFNPs are expected to have high economic efficiency. This study investigated the reactor power behavior of a BWR-type OFNP using three-dimensional transient neutronics-thermal hydraulics coupled analysis. Heave and pitch motions were considered under realistic wave conditions using a typical BWR model. The results show that the reactor power and its distribution can vary because of the wave-induced platform motion; however, the amplitude of these variations is sufficiently small to ensure normal operation, even under the extreme wave conditions of a one-in-10,000-year storm. Although the results of the present study demonstrate the ability of BWR-type OFNPs to provide a safe and stable energy supply, they also suggest the need for further research. Further studies are needed to address the complex wave conditions and assess the effects of the platform motion on ancillary systems, such as recirculation systems.
小林 大志*; Moniruzzaman, M.*; 元川 竜平; 佐々木 隆之*
Applied Geochemistry, 202, p.106780_1 - 106780_11, 2026/05
被引用回数：0The geochemical environment for lanthanide (Ln) oxides and hydroxides involves aquatic system processes where Lns are mobilized or immobilized by dissolution and precipitation. In the current study, solubility experiments were performed using lanthanum (La), europium (Eu), and thulium (Tm) oxides as starting materials in the undersaturation method and La, Eu, and Tm nitrate solutions as starting materials in the oversaturation method. After aging at 25 or 90
C for given periods, the crystal structure, particle size, and solid-phase surface-charge states were investigated to interpret the La, Eu, and Tm solubilities. In aqueous systems, La is stable as La(OH)
(cr), which dominates the bulk structure, surface-charge state, and solubility. In the oversaturation method at 25C, the presence of fine primary La(OH)(cr,np) particles with higher solubility was observed, suggesting the possible particle-size effect. However, in the undersaturation method at 90C, the surface-charge state was found to be more negative than that of other solid phases, resulting in lower solubility. The Eu
O and Eu(OH) stabilities are competitive in aqueous systems. The bulk solid phase was Eu(OH)(cr) in the oversaturation method at 25 and 90C, and in the undersaturation method at 90C, whereas the surface-charge state appeared to be controlled by EuO when aged at 90C. The stability of TmO increased further, so that TmO(cr) dominated the bulk, surface-charge state, and solubility, aged at both 25 and 90C in the undersaturation method. In contrast, Tm(OH)(am) was formed using the oversaturation method and dominated the bulk, surface-charge state, and solubility at both temperatures. These findings are expected to provide important clues for understanding the evolution of lighter-to-heavier Ln oxides and hydroxides in aqueous systems, which is important for radioactive waste disposal.
Sr
MnO with weak magnetoresistanceSterling, T. C.*; Savici, A. T.*; 梶本 亮一; 池内 和彦*; Khan, N.*; Weber, F.*; Reznik, D.*
Communications Materials (Internet), 7, p.121_1 - 121_11, 2026/05
We investigated phonons and spin-phonon coupling in ferromagnetic colossal magnetoresistance (CMR) manganites LaSrMnO (
) that have a relatively small CMR associated with the melting of the magnetic order above room temperature. High-resolution neutron scattering experiments combined with density functional theory (DFT) show that the low-temperature ferromagnetic phase is conventional: neutron scattering intensities from phonons agree with DFT predictions, magnons follow sinusoidal dispersions, and no phonon-magnon hybridization occurs. Fluctuations of Mn moments and low-energy phonons involving Mn and La vibrations remain conventional in the high temperature paramagnetic phase, indicating that the Mn and La/Sr sublattices are not strongly perturbed by the melting of magnetic order. In sharp contrast, the Jahn-Teller active optical oxygen vibrations collapse entirely above the Curie temperature, in spite of the low CMR in these compositions, with at least part of the lost spectral weight reappearing as quasielastic scattering. We attribute this highly anomalous behavior to giant electron-phonon coupling (EPC) in the charge and/or orbital channel. It drives cooperative diffusive motion of quasistatic carrier-trapping oxygen sublattice distortions once ferromagnetism disappears. We hypothesize that the magnitude of magnetoresistance correlates with the rate of this diffusion rather than with the strength of Jahn-Teller EPC.
高柳 智弘; 植野 智晶*; 堀野 光喜*; 杉田 萌; 不破 康裕; 篠崎 信一
IEEE Transactions on Applied Superconductivity, 36(3), p.4900905_1 - 4900905_5, 2026/05
被引用回数：0 パーセンタイル：0.00(Engineering, Electrical & Electronic)Compared to DC magnets with constant current, pulsed magnets with instantaneous current flow are superior in terms of energy conservation because the time required to generate Joule heat due to the electrical resistance of the coil is limited. However, the magnetic field distribution that affects beam orbit control cannot be known accurately until the pulse power supply is excited, because the current path through the coil and the load resistance changes with time due to the current skin effect, respectively. For this reason, we have introduced model-based development (MBD), which integrates electromagnets and power supplies, whereas previous simulation analysis was performed separately for electromagnets and power supplies. For the simulation, we combined OPERA-3D transient analysis, which has a proven track record in the development of pulsed magnets for the J-PARC accelerator, and MATLAB/Simulink for circuit simulation. The introduction of MBD is expected to reduce the number of actual prototypes and development costs and shorten the development period because highly accurate results can be obtained in a short period of time. In addition, simulation of trouble cases that cannot be covered by verification of actual machines alone is possible, which is expected to improve safety. In this presentation, we will report the evaluation results compared to the actual machine.
茂木 孝介; 塩津 弘之; 松本 俊慶; 日引 俊詞*; 柴本 泰照
International Journal of Heat and Mass Transfer, 258, p.128275_1 - 128275_15, 2026/05
被引用回数：0 パーセンタイル：0.00(Thermodynamics)We established a methodology to quantify chemical kinetic uncertainties, specifically the uncertainty in reaction rate constants, in Reynolds-Averaged Navier-Stokes (RANS) simulations of turbulent premixed combustion. The methodology consists of three main steps. First, an uncertainty database for the hydrogen combustion reaction was constructed. Second, these uncertainties were propagated to the laminar flame speed, which served as the input data for the subsequent RANS simulation, through a freely propagating flat flame simulation. Third, the uncertainty in the laminar flame speed was propagated to quantities of interest (QoIs) through the RANS simulation. We employed the non-intrusive polynomial chaos method to reduce the number of demanding RANS simulation runs. The established methodology was applied to the flame acceleration benchmark experiments in the ENACCEF facility, revealing that the analysis successfully quantified the uncertainty within an acceptable computational cost. The uncertainty analysis showed that the uncertainty in the propagating flame was closely related to the physical mechanisms involved in the acceleration process. Finally, we discussed the factors influencing the results and examined the validity of the proposed uncertainty analysis.
years considering uncertainty of sea level change高井 静霞; 打越 絵美子*; 島田 太郎; 武田 聖司
MRS Advances (Internet), 11(6), p.651 - 656, 2026/05
放射性廃棄物の中深度処分(評価期間:10万年、地表からの離隔距離:70mを確保)では、長期的な地形変化・海水準変動に伴う影響評価(埋設深度の減少、地下水流動・地下環境の変化)が重要となる。将来の海水準変動の不確かさを考慮するには、地形発達モデル(Landscape evolution models: LEMs)に基づく数値解析が有用である。しかし輸送面で処分地として好ましい沿岸域では、将来万年スケールの地形変化の評価例がない。本研究では、過去12.5万年間の再現解析(最終氷期・間氷期サイクル)に基づく将来万年スケールの地形変化評価の方法論を構築し、原子力機構で開発中のLEMsを用いて青森県上北沿岸で検証した。(i)過去から現在の再現解析:測定から直接推定できないLEMsのパラメータを、現地形を再現する値としてキャリブレートした(再現した現地形と実地形の標高差:領域の約8割で
15m以内)。(ii)将来予測:再現解析と同等の12.5万年間を対象に、過去から現在を再現するパラメータの外挿により将来を予測した。将来の海水準変動は、過去の変動・氷河性地殻均衡に基づく既往評価から3パターン(基本ケース(温暖化が継続、5万年後に寒冷化)、寒冷化ケース(現在から氷期に突入)、温暖化ケース(高海水準が持続))を設定した。埋設深度を100mと仮定した場合、70mの深度を確保するには侵食量を30m以内に抑える必要がある。評価の結果、12.5万年間で30m以上の侵食が生じたのは、河川域(中
下流域)および沿岸域(上限想定した最高海水準(+15m))であった。河川の鉛直方向の侵食には海水準低下が影響し、寒冷化ケース(海水準が-150mまで低下・持続)では、現河口での侵食深は約100m(現在の倍程度)となった。河川・沿岸域の水平方向の侵食には海水準上昇が影響し、基本ケース(海水準が+15mまで上昇)では、下流域において現地形の+15mの等高線より数百m陸側まで侵食が生じた。さらに流域平均起伏は海水準低下に連動して顕著に変化した。
-iron at high pressures determined using 
neutron diffraction青木 勝敏*; 高野 将大*; 福山 鴻*; 鍵 裕之*; 町田 晃彦*; 齋藤 寛之*; 服部 高典; 佐野 亜沙美; 舟越 賢一*
Physical Review B, 113(18), p.184440_1 - 184440_6, 2026/05
体心立方(bcc)-鉄の磁気モーメントの温度依存性をその場中性子粉末回折法を用いて、約2GPaおよび6GPaの圧力下で300950Kの範囲において調べた。磁気散乱の相対寄与を高めるため、中性子散乱長が天然Feの約半分である
Fe同位体が用いられた。キュリー温度(
)は、2.1GPa, 6.0GPa, 6.7GPaでそれぞれ946(30)K、838(50)K、740(40)Kと決定され、(K) = 1043 - 49(7)
+ 1.3(1.2)
で表される磁気相境界が決定された。6.7GPaで加熱すると、磁気転移に続いて
構造転移が観測された。この結果は、磁気相境界が相境界の低温側に位置することを示している。したがって、転移は、常磁性bcc鉄から常磁性fcc鉄への構造変化に対応する。
高橋 直生*; 坂巻 竜也*; 服部 高典; 舟越 賢一*; 有馬 寛*; 佐野 亜沙美; 阿部 淳*; 鈴木 昭夫*
Scientific Reports (Internet), 16, p.14162_1 - 14162_13, 2026/05
液状鉄中の水素含有量を測定するため、その場での高圧・高温中性子回折およびイメージング実験を行った。その結果、3.4GPa、1400Kの条件下で液状鉄には0.17(3)wt.%のHが含まれていることが確認され、これはコア形成過程において、液状鉄がマグマオーシャン内で水素化されることを示唆している。マグマオーシャンの底部に存在する液体鉄の水素含有量について、外核と内核にはそれぞれ0.60-0.72wt.%および0.30-0.44wt.%の水素が含まれていると推定された。これは、マグマオーシャン中の水素質量のそれぞれ70-85倍および1.9-2.7倍に相当する。このことは、外核の密度不足の半分以上を水素が占めている可能性を示唆している。水素に富んだ初期大気と平衡状態にあるマグマオーシャンについて、本研究の結果は、液状鉄が大量の水素をコアへ輸送する上で極めて重要な役割を果たしていることを示している。
近藤 正聡*; 北村 嘉規*; 瓦井 篤志*; 斎藤 滋; 大林 寛生
Corrosion Science, 262, p.113646_1 - 113646_14, 2026/04
被引用回数：0 パーセンタイル：0.00(Materials Science, Multidisciplinary)流動鉛ビスマス共晶合金(LBE)中におけるFeCrAl合金APMT(Fe-21Cr-5Al-3Mo)の耐食性を、非等温強制循環ループ(OLLOCHI)を用いた腐食試験により調べた。試験温度は723K、LBE中の酸素濃度は1
10
wt%に制御した。流動LBEに2000時間及び4000時間浸漬した試験片では、深刻な腐食や侵食は検出されなかった。腐食試験中、APMT表面にはFeリッチ層、Crリッチ層、Alリッチ層からなる多重酸化物層が形成され、これらが腐食と侵食を抑制した。これらの酸化物層を研磨により除去した試験片をさらに2000時間流動LBE中に再浸漬した。その結果、研磨面に酸化層が再形成された。この挙動はこのFeCrAl合金が自己修復能力を有することを示唆している。2000時間の腐食試験後のマイクロスクラッチ試験の結果から、その場形成された多重酸化皮膜はせん断方向において高い付着強度を示したことが確認された。
Mohamad, A. B.; Chen, J.*; 井岡 郁夫*; 鈴木 恵理子; 近藤 啓悦; 阿部 陽介; 山下 真一郎; 大久保 成彰; 根本 義之; 岡田 裕史*; et al.
Journal of Nuclear Materials, 625, p.156513_1 - 156513_9, 2026/04
被引用回数：0 パーセンタイル：0.00(Materials Science, Multidisciplinary)Ion irradiation was carried out on Cr coating Zry cladding to investigate their microstructure evolution and mechanical properties. The sample was irradiated at reactor normal operation conditions. Microstructural observation and mechanical testing of non-irradiated samples and irradiated samples were performed to understand irradiation damage to the Cr-coated Zry cladding. Results of High Resolution Transmission Electron Microscopy and chemical analysis revealed Fe enrichment at the Cr coating and Zr substrate interface of irradiated samples due to irradiation enhanced diffusion or irradiation induced mixing. Irradiation led to the formation of Fe enrichment at the Cr Zr interface approximately 15nm. Moreover, hardening of the Cr coating and Zr substrate regions was observed in the irradiated sample.
InGe studied by single crystal neutron diffraction田端 千紘; 金子 耕士; 中尾 朗子*; 大原 高志; 松田 達磨*; 大貫 惇睦*
Journal of the Physical Society of Japan, 95(5), p.053702_1 - 053702_4, 2026/04
The magnetic order of EuIrInGe, which crystallizes in a Dresselhaus-type noncentrosymmetric tetragonal structure, was investigated using two complementary single-crystal neutron diffraction approaches. Time-of-flight single-crystal diffraction reveals antiferromagnetic Bragg reflections with propagation vector q = (0, 0, 0) below the Neel temperature TN = 2.5 K, indicating a breaking of body-centered translational symmetry. Polarized neutron diffraction on a triple-axis spectrometer demonstrates that the ordered Eu2+ 4f moments lie within the basal plane and form a collinear antiferromagnetic structure with antiparallel alignment between corner and body-center sites. Despite the Dresselhaus-type spin splitting in the conduction bands, the magnetic order remains simple, implying weak coupling between localized moments and itinerant electrons.
