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論文

Spin density wave and van Hove singularity in the kagome metal CeTiBi

Park, P.*; Ortiz, B. R.*; Spargue, M.*; Sakuya, A. P.*; Chen, S. A.*; Frontzek, M. D.*; Tian, W.*; Sibille, R.*; Mazzone, D. G.*; 田端千紘; et al.

Nature Communications (Internet), 16, p.4384_1 - 4384_9, 2025/05

https://doi.org/10.1038/s41467-025-59460-4

被引用回数：4 パーセンタイル：96.81(Multidisciplinary Sciences)

Kagome metals with van Hove singularities (VHSs) near the Fermi level can host intriguing quantum phenomena, including chiral loop currents, electronic nematicity, and unconventional superconductivity. However, unconventional magnetic states driven by VHSs, such as spin-density waves (SDWs), have yet to be observed experimentally in kagome metals. Here, we present a comprehensive investigation of the magnetic and electronic structure of the layered kagome metal CeTiBi, where the Ti kagome electronic structure interacts with a magnetic sublattice of Ce $^{3+}$ $J_{rm eff}$ = 1/2 moments. Our findings establish the rare-earth Kagome metals LnTi3Bi4 as a model platform where characteristic electronic structure of the kagome lattice plays a pivotal role in magnetic order.

論文

Unusual low-temperature ductility increase mediated by dislocations alone

Naeem, M.*; Ma, Y.*; Tian, J.*; Kong, H.*; Romero-Resendiz, L.*; Fan, Z.*; Jiang, F.*; Gong, W.; Harjo, S.; Wu, Z.*; et al.

Materials Science & Engineering A, 924, p.147819_1 - 147819_10, 2025/02

https://doi.org/10.1016/j.msea.2025.147819

被引用回数：1 パーセンタイル：79.97(Nanoscience & Nanotechnology)

Face-centered cubic (fcc) medium-/high-entropy alloys (M/HEAs) typically enhance strength and ductility at cryogenic temperatures via stacking faults, twinning, or martensitic transformation. However, in-situ neutron diffraction on VCoNi MEA at 15 K reveals that strain hardening is driven solely by rapid dislocation accumulation, without these mechanisms. This results in increased yield strength, strain hardening, and fracture strain. The behavior, explained by the Orowan equation, challenges conventional views on cryogenic strengthening in fcc M/HEAs and highlights the role of dislocation-mediated plasticity at low temperatures.

論文

Iron coupled with hydroxylamine turns on the "switch" for free radical degradation of organic pollutants under high pH conditions

Tian, Q.*; Feng, L.*; Wu, C.*; Wen, J.*; Qiu, X.*; 田中万也; 大貫敏彦*; Yu, Q.*

Journal of Colloid and Interface Science, 669, p.1006 - 1014, 2024/09

https://doi.org/10.1016/j.jcis.2024.05.021

被引用回数：3 パーセンタイル：35.24(Chemistry, Physical)

In this study, we assessed the impact of solution pH on organic pollutant degradation by goethite with the addition of hydroxylamine. This study demonstrated that the system can continuously scavenge organic pollutants through oxygen-mediated generation of free radicals under alkaline conditions.

論文

Fine structure in the decay of the 8 $^{+}$ isomer in $^{216,218}$ U

Zhang, M. M.*; Tian, Y. L.*; Wang, Y. S.*; Zhang, Z. Y.*; Gan, Z. G.*; Yang, H. B.*; Huang, M. H.*; Ma, L.*; Yang, C. L.*; Wang, J. G.*; et al.

Physical Review C, 106(2), p.024305_1 - 024305_6, 2022/08

https://doi.org/10.1103/PhysRevC.106.024305

被引用回数：5 パーセンタイル：55.21(Physics, Nuclear)

The extremely neutron-deficient even-even uranium isotopes $^{216,218}$ U were produced in the complete-fusion reactions induced by impinging $^{40}$ Ar and $^{40}$ Ca ions on $^{180,182,184}$ W targets. Fusion evaporation residues were separated in flight by the gas-filled recoil separator SHANS (Spectrometer for Heavy Atoms and Nuclear Structure) and subsequently identified using the recoil--correlation method. In this paper, we report on new -decay activities with $E_{alpha} = 10163(27)$ keV for $^{216}$ U and $E_{alpha} = 10073(16)$ keV for $^{218}$ U, which decay from the 8 $^{+}$ isomeric states of $^{216,218}$ U into the 2 $^{+}$ states of their daughter nuclei $^{212,214}$ Th, respectively. The new results extend the systematics of the -decay fine structure for the = 124 and 126 even-even isotones.

論文

Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs

Xu, Z.*; Dai, G.*; Li, Y.*; Yin, Z.*; Rong, Y.*; Tian, L.*; Liu, P.*; Wang, H.*; Xing, L.*; Wei, Y.*; et al.

npj Quantum Materials (Internet), 5(1), p.11_1 - 11_7, 2020/02

https://doi.org/10.1038/s41535-020-0212-x

被引用回数：5 パーセンタイル：42.20(Materials Science, Multidisciplinary)

We use neutron scattering to study Vanadium (hole)-doped LiFe $_{1-x}$ V $_{x}$ As. In the undoped state, LiFeAs exhibits superconductivity at $T_mathrm{c} = 18$ K and transverse incommensurate spin excitations similar to electron overdoped iron pnictides. Upon Vanadium doping to form LiFe $_{0.955}$ V $_{0.045}$ , the transverse incommensurate spin excitations in LiFeAs transform into longitudinally elongated ones in a similar fashion to that of potassium (hole)-doped Ba $_{0.7}$ K $_{0.3}$ Fe $_{2}$ As $_{2}$ but with dramatically enhanced magnetic scattering and elimination of superconductivity. This is different from the suppression of the overall magnetic excitations in hole-doped BaFe $_{2}$ As $_{2}$ and the enhancement of superconductivity near optimal hole doping. These results are consistent with density function theory plus dynamic mean field theory calculations, suggesting that Vanadium doping in LiFeAs may induce an enlarged effective magnetic moment $S_mathrm{eff}$ with a spin crossover ground state arising from the inter-orbital scattering of itinerant electrons.

論文

IAEA Photonuclear Data Library 2019

河野俊彦*; Cho, Y. S.*; Dimitriou, P.*; Filipescu, D.*; 岩本信之; Plujko, V.*; Tao, X.*; 宇都宮弘章*; Varlamov, V.*; Xu, R.*; et al.

Nuclear Data Sheets, 163, p.109 - 162, 2020/01

https://doi.org/10.1016/j.nds.2019.12.002

被引用回数：133 パーセンタイル：99.72(Physics, Nuclear)

We report our coordinated efforts to address these data needs such as radiation shielding design and radiation transport analyses, and present the results of the new evaluations of more than 200 nuclides included in the new updated IAEA Photonuclear Data Library, where the photon energy goes up to 200 MeV. We discuss the new assessment method and make recommendations to the user community in cases where the experimental data are discrepant and the assessments disagree. In addition, in the absence of experimental data, we present model predictions for photon-induced reaction cross section on nuclides of potential interest to medical radioisotope production.

論文

Uniaxial pressure effect on the magnetic ordered moment and transition temperatures in BaFe $_{2-x}$ T $_{x}$ As $_{2}$ ( = Co,Ni)

Tam, D. M.*; Song, Y.*; Man, H.*; Cheung, S. C.*; Yin, Z.*; Lu, X.*; Wang, W.*; Frandsen, B. A.*; Liu, L.*; Gong, Z.*; et al.

Physical Review B, 95(6), p.060505_1 - 060505_6, 2017/02

https://doi.org/10.1103/PhysRevB.95.060505

被引用回数：24 パーセンタイル：67.21(Materials Science, Multidisciplinary)

We use neutron diffraction and muon spin relaxation to study the effect of in-plane uniaxial pressure on the antiferromagnetic (AF) orthorhombic phase in BaFe $_{2-x}$ T $_{x}$ As $_{2}$ and its Co- and Ni-substituted members near optimal superconductivity. In the low-temperature AF ordered state, uniaxial pressure necessary to detwin the orthorhombic crystals also increases the magnetic ordered moment, reaching an 11% increase under 40 MPa for BaFe $_{1.9}$ Co $_{0.1}$ As, and a 15% increase for BaFe $_{1.915}$ Ni $_{0.085}$ As. We also observe an increase of the AF ordering temperature () of about 0.25 K/MPa in all compounds, consistent with density functional theory calculations that reveal better Fermi surface nesting for itinerant electrons under uniaxial pressure. The doping dependence of the magnetic ordered moment is captured by combining dynamical mean field theory with density functional theory, suggesting that the pressure-induced moment increase near optimal superconductivity is closely related to quantum fluctuations and the nearby electronic nematic phase.

論文

Local structure of LiNiO studied by neutron diffraction

Chung, J.-H.*; Proffen, T.*; 社本真一; Ghorayeb, A. M.*; Croguennec, L.*; Tian, W.*; Sales, B. C.*; Jin, R.*; Mandrus, D.*; 江上毅*

Physical Review B, 71(6), p.064410_1 - 064410_11, 2005/02

https://doi.org/10.1103/PhysRevB.71.064410

被引用回数：92 パーセンタイル：91.82(Materials Science, Multidisciplinary)

LiNiOは、これまでS=1/2の三角格子系としてよく研究されてきたが、そのスピン相関に関してはまだよくわかっていない。そこではヤーンテラー効果による軌道状態も問題となるが、これまで長距離の格子歪みは見つかっていない。今回これまで行われたことのない幅広い実空間での結晶PDF解析を行うことで、短距離から長距離までさまざまな格子歪みが見つかった。この結果は10nmのドメインを持つナノ構造軌道秩序モデルで説明される。この局所的な軌道秩序状態が基となって、複雑な磁気特性が現れていると思われる。

論文

Fluorescence and IR studies on the hydration state of lanthanides(III) and curium(III) in the complexes extracted with purified Cyanex301, Cyanex302 and Cyanex272

Tian, G.*; 木村貴海; 吉田善行; Zhu, Y.*; Rao, L.*

Radiochimica Acta, 92(8), p.495 - 499, 2004/08

https://doi.org/10.1524/ract.92.8.495.39274

被引用回数：17 パーセンタイル：70.69(Chemistry, Inorganic & Nuclear)

精製したCyanex301, Cyanex302及びCyanex272により抽出されたランタノイド、Ln(III)(Ln=Sm, Eu, Tb, Dy)とCm(III)の水和数を時間分解レーザー誘起蛍光分光(TRLFS)と赤外吸収分光(FT-IR)を用いて調べた。Cyanex302またはCyanex272で抽出されたLn(III)とCm(III)の水和数と錯体組成に違いはみられなかった。Cyanex302で抽出されたLn(III)とCm(III)の錯体はML(HL $_{2}$ ) $_{2}$ nH $_{2}$ O(n=3-5)であった。Cyanex272で抽出されたLn(III)とCm(III)の錯体の第1配位圏に水はなく、M(HL $_{2}$ ) $_{3}$ であった。これらに反して、Cyanex301で抽出されたLn(III)とCm(III)の錯体組成は異なった。Ln(III)のCyanex301錯体は1-2個の水分子を含み、LnL $_{3}$ 2H $_{2}$ OまたはHLnL $_{4}$ H $_{2}$ Oであった。Cm(III)のCyanex301錯体は水分子を含まずHCmL $_{4}$ であった。

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