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論文

Low-temperature deformation mechanism in a work-hardenable body-centered cubic high-entropy alloy with a large uniform elongation

Zhu, L.*; Dong, W.*; Naeem, M.*; Kong, H.*; Hu, C.*; Fan, Z.*; Gong, W.; Harjo, S.; Lan, S.*; Wu, Y.*; et al.

Acta Materialia, 303, p.121734_1 - 121734_10, 2026/01

https://doi.org/10.1016/j.actamat.2025.121734
 被引用回数：3 パーセンタイル：51.29(Materials Science, Multidisciplinary)

Body-centered cubic (BCC) metals typically exhibit high yield strength but limited work hardening and uniform elongation, especially at low temperatures. High-entropy alloys (HEAs) offer opportunities to overcome these limitations, though their deformation mechanisms remain unclear. Using in situ neutron diffraction and microstructural analysis, this study identifies the origin of the exceptionally large uniform elongation at liquid nitrogen temperature in a single-phase BCC (TiZrHf)$$_{86.4}$$Al$$_2$$Nb$$_{11.6}$$ HEA. Initial plastic deformation is governed by a BCC-to-orthorhombic ($$alpha$$") transformation, followed by $$alpha$$" twinning and deformation-induced amorphization at later stages. The cooperation of these mechanisms suppresses work softening from dislocation plasticity, enabling high yield strength with large uniform elongation and providing a viable strategy for designing cryogenic structural materials.

論文

Spin correlations in the nematic quantum disordered state of FeSe

Liu, R.*; Stone, M. B.*; Gao, S.*; 中村 充孝; 蒲沢 和也*; Krajewska, A.*; Walker, H. C.*; Cheng, P.*; Yu, R.*; Si, Q.*; et al.

Nature Communications (Internet), 16, p.5212_1 - 5212_8, 2025/06

https://doi.org/10.1038/s41467-025-60071-2
 被引用回数：5 パーセンタイル：81.47(Multidisciplinary Sciences)

The quantum-disordered state in FeSe, intertwined with superconductivity and nematicity, has been a research focus in iron-based superconductors. Temperature-dependent differences between Q= (1, 0) and (0, 1) spin excitations above the structural transition unambiguously reveals the nematic quantum disordered state. Comparison with NaFeAs suggests the Neel excitations originate from enhanced 3dxy orbital correlations. Modeling the stripe dispersions using a J1-K-J2 Heisenberg Hamiltonian, we establish a spininteraction phase diagram, positioning FeSe near a crossover regime between the antiferroquadrupolar, Neel, and stripe orders. Our results provide key insights into themicroscopic spin interactions and their role in the intertwined orders in iron-based superconductors.

論文

Effect of a repulsive three-body interaction on the $$DD^{(*)}K$$ molecule

Pan, Y.-W.*; Lu, J.-X.*; 肥山 詠美子*; Geng, L.-S.*; 保坂 淳

Physical Review D, 111(11), p.114006_1 - 114006_9, 2025/06

https://doi.org/10.1103/jk8x-qv2p
 被引用回数：2 パーセンタイル：53.99(Astronomy & Astrophysics)

ガウス展開法を使った三体計算によって$$DD^{(*)}K$$分子に対する斥力三体力の影響を調べた結果を報告する。

論文

Low-energy spin excitations in detwinned FeSe

Liu, R.*; 中村 充孝; 蒲沢 和也*; Lu, X.*

Chinese Physics Letters, 41(6), p.067401_1 - 067401_7, 2024/08

https://doi.org/10.1088/0256-307X/41/6/067401
 被引用回数：4 パーセンタイル：47.75(Physics, Multidisciplinary)

Antiferromagnetic spin fluctuation is regarded as the leading driving force for electron pairing in high-$$T_{rm c}$$ superconductors. Here, we use inelastic neutron scattering (INS) to investigate the symmetry and in-plane wave-vector dependence of low-energy spin excitations in uniaxial-strain detwinned FeSe. The low-energy spin excitations ($$E$$ $$<$$ 10 meV) appear mainly at $$Q$$ = ($$pm$$ 1, 0) in the superconducting state ($$T$$ $$_sim^{<}$$ 9 K) and the nematic state ($$T$$ $$_sim^{<}$$ 90 K), confirming the constant C$$_{2}$$ rotational symmetry and ruling out the C$$_{4}$$ mode at $$E$$ $$approx$$ 3 meV reported in a prior INS study. Moreover, our results reveal an isotropic spin resonance in the superconducting state, which is consistent with the $$s$$$$^{pm}$$ wave pairing symmetry. At slightly higher energy, low-energy spin excitations become highly anisotropic.

論文

Probing deformation behavior of a refractory high-entropy alloy using ${it in situ}$ neutron diffraction

Zhou, Y.*; Song, W.*; Zhang, F.*; Wu, Y.*; Lei, Z.*; Jiao, M.*; Zhang, X.*; Dong, J.*; Zhang, Y.*; Yang, M.*; et al.

Journal of Alloys and Compounds, 971, p.172635_1 - 172635_7, 2024/01

https://doi.org/10.1016/j.jallcom.2023.172635
 被引用回数：7 パーセンタイル：33.32(Chemistry, Physical)

The grain orientation-dependent lattice strain evolution of a (TiZrHfNb)$$_{98}$$$$N_2$$ refractory high-entropy alloy (HEA) during tensile loading has been investigated using ${it in situ}$ neutron diffraction. The equivalent strain-hardening rate of each of the primary $$<hkl>$$-oriented grain families was found to be relatively low, manifesting the macroscopically weak work-hardening ability of such a body-centered cubic (BCC)-structured HEA. This finding is indicative of a dislocation planar slip mode that is confined in a few single-slip planes and leads to in-plane softening by high pile-up stresses.

論文

Fe, Mn and $$^{238}$$U accumulations in ${it Phragmites australis}$ naturally growing at the mill tailings pond; Iron plaque formation possibly related to root-endophytic bacteria producing siderophores

中本 幸弘*; 土山 紘平*; 春間 俊克*; Lu, X.*; 田中 万也; 香西 直文; 福山 賢仁; 福嶋 繁; 小原 義之; 山路 恵子*

Minerals (Internet), 11(12), p.1337_1 - 1337_17, 2021/12

AA2021-0764.pdf:3.94MB

https://doi.org/10.3390/min11121337
 被引用回数：5 パーセンタイル：26.87(Geochemistry & Geophysics)

坑水は、重金属の含有や低pHのため、世界中で鉱業の重要な水問題となっている。水生植物による「rhizofiltration」は、根系に重金属を蓄積することにより水中の重金属を除去する効果的な浄化方法のひとつである。ヨシは根の周囲に鉄プラークを形成して重金属を蓄積することから「rhizofiltration」に使用できる候補植物とされる。本研究調査地である人形峠ウラン鉱山の鉱さいたい積場には1998年からヨシが自然に繁茂している。本研究の結果から、ヨシはFe, Mn, Uを高濃度で節根に蓄積しており、また鉄プラークを形成する節根にもこれらの元素が高濃度蓄積していることが明らかになった。さらにヨシの節根から分離した細菌837株のうち88.6%にシデロフォア産生能が確認された。細菌のシデロフォアにはカテコール基を有するものが多く報告されているが、Feとカテコールあるいはフェノール性化合物の錯体はネットワークを形成することにより沈殿することが知られている。そこで本研究では、ヨシの根周囲の鉄プラーク形成に微生物の産生するシデロフォアが影響するという仮説を立てた。内生細菌${it Pseudomonas}$ spp.や${it Rhizobium}$ spp.の代謝産物にFeイオンを加えたところ沈殿が確認され、これらの細菌の代謝産物としてフェノール性化合物が検出された。以上より、ヨシの根から分離した内生細菌${it Pseudomonas}$ spp.及び${it Rhizobium}$ spp.が産生するシデロフォアはFeと沈殿することで、鉄プラーク形成に影響している可能性が考えられた。また、鉄プラークは植物体外の金属蓄積部位としてヨシの重金属耐性に関与すると考えられることから、内生細菌${it Pseudomonas}$ spp.と${it Rhizobium}$ spp.が間接的にヨシの耐性に貢献している可能性が考えられた。

論文

Stacking fault driven phase transformation in CrCoNi medium entropy alloy

He, H.*; Naeem, M.*; Zhang, F.*; Zhao, Y.*; Harjo, S.; 川崎 卓郎; Wang, B.*; Wu, X.*; Lan, S.*; Wu, Z.*; et al.

Nano Letters, 21(3), p.1419 - 1426, 2021/02

https://doi.org/10.1021/acs.nanolett.0c04244
 被引用回数：111 パーセンタイル：97.49(Chemistry, Multidisciplinary)

In CrCoNi, a so-called medium-entropy alloy, an fcc-to-hcp phase transformation has long been anticipated. Here, we report an in situ loading study with neutron diffraction, which revealed a bulk fcc-to-hcp phase transformation in CrCoNi at 15 K under tensile loading. By correlating deformation characteristics of the fcc phase with the development of the hcp phase, it is shown that the nucleation of the hcp phase was triggered by intrinsic stacking faults. The confirmation of a bulk phase transformation adds to the myriads of deformation mechanisms available in CrCoNi, which together underpin the unusually large ductility at low temperatures.

論文

Quasifree neutron knockout reaction reveals a small $$s$$-Orbital component in the Borromean nucleus $$^{17}$$B

Yang, Z. H.*; 久保田 悠樹*; Corsi, A.*; 吉田 数貴; Sun, X.-X.*; Li, J. G.*; 木村 真明*; Michel, N.*; 緒方 一介*; Yuan, C. X.*; et al.

Physical Review Letters, 126(8), p.082501_1 - 082501_8, 2021/02

AA2020-0819.pdf:1.29MB

https://doi.org/10.1103/PhysRevLett.126.082501
 被引用回数：92 パーセンタイル：97.13(Physics, Multidisciplinary)

ボロミアン核であり中性子ハロー構造が期待される$$^{17}$$Bに対する($$p$$,$$pn$$)反応実験を行った。断面積の運動量分布を分析することで、$$1s_{1/2}$$と$$0d_{5/2}$$軌道の分光学的因子を決定した。驚くべきことに、$$1s_{1/2}$$の分光学的因子は9(2)%と小さいことが明らかになった。この結果は、連続状態を含むdeformed relativistic Hartree-Bogoliubov理論によってよく説明された。本研究の結果によると、現在知られているハロー構造を持つとされる原子核の中で$$^{17}$$Bは$$s$$および$$p$$軌道の成分が最も小さく、$$s$$または$$p$$軌道成分が支配的であることが必ずしもハロー構造の前提条件ではない可能性を示唆している。

論文

Extremely high dislocation density and deformation pathway of CrMnFeCoNi high entropy alloy at ultralow temperature

Naeem, M.*; He, H.*; Harjo, S.; 川崎 卓郎; Zhang, F.*; Wang, B.*; Lan, S.*; Wu, Z.*; Wu, Y.*; Lu, Z.*; et al.

Scripta Materialia, 188, p.21 - 25, 2020/11

https://doi.org/10.1016/j.scriptamat.2020.07.004
 被引用回数：105 パーセンタイル：97.88(Nanoscience & Nanotechnology)

The deformation behavior of CrMnFeCoNi high entropy alloy was investigated by in situ neutron diffraction at an ultralow temperature of 15 K. Analysis of the diffraction peak widths showed an extremely high dislocation density at 15 K, reaching $$sim$$10$$^{16}$$ m$$^{-2}$$. In addition, the dislocation density was found to closely follow the development of texture caused by deformation. In contrast to deformation by dislocation slip at room temperature, the ultralow-temperature deformation also involved stacking faults, twinning and serrations. The deformation pathway at ultralow temperature is outlined which is responsible for the extraordinary strength-ductility combination.

論文

Shell structure of the neutron-rich isotopes $$^{69,71,73}$$Co

Lokotko, T.*; Leblond, S.*; Lee, J.*; Doornenbal, P.*; Obertelli, A.*; Poves, A.*; Nowacki, F.*; 緒方 一介*; 吉田 数貴; Authelet, G.*; et al.

Physical Review C, 101(3), p.034314_1 - 034314_7, 2020/03

https://doi.org/10.1103/PhysRevC.101.034314
 被引用回数：17 パーセンタイル：78.88(Physics, Nuclear)

中性子過剰核である$$^{69,71,73}$$Coに対する($$p,2p$$)ノックアウト反応が理化学研究所RIBFで測定された。$$gamma-gamma$$ coincidenceの方法で準位構造が決定され、測定された包括的断面積および排他的断面積から暫定的ではあるがスピン・パリティが決定された。殻模型計算との比較により、$$^{69,71,73}$$Coの低励起状態には球形核と変形核が共存することが示唆された。

論文

Cooperative deformation in high-entropy alloys at ultralow temperatures

Naeem, M.*; He, H.*; Zhang, F.*; Huang, H.*; Harjo, S.; 川崎 卓郎; Wang, B.*; Lan, S.*; Wu, Z.*; Wang, F.*; et al.

Science Advances (Internet), 6(13), p.eaax4002_1 - eaax4002_8, 2020/03

https://doi.org/10.1126/sciadv.aax4002
 被引用回数：298 パーセンタイル：99.45(Multidisciplinary Sciences)

High-entropy alloys exhibit exceptional mechanical properties at cryogenic temperatures, due to the activation of twinning in addition to dislocation slip. The coexistence of multiple deformation pathways raises an important question regarding how individual deformation mechanisms compete or synergize during plastic deformation. Using in situ neutron diffraction, we demonstrate the interaction of a rich variety of deformation mechanisms in high-entropy alloys at 15 K, which began with dislocation slip, followed by stacking faults and twinning, before transitioning to inhomogeneous deformation by serrations. Quantitative analysis showed that the cooperation of these different deformation mechanisms led to extreme work hardening. The low stacking fault energy plus the stable face-centered cubic structure at ultralow temperatures, enabled by the high-entropy alloying, played a pivotal role bridging dislocation slip and serration.

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：8 パーセンタイル：49.28(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

Fine structure in the $$alpha$$ decay of $$^{223}$$U

Sun, M. D.*; Liu, Z.*; Huang, T. H.*; Zhang, W. Q.*; Andreyev, A. N.; Ding, B.*; Wang, J. G.*; Liu, X. Y.*; Lu, H. Y.*; Hou, D. S.*; et al.

Physics Letters B, 800, p.135096_1 - 135096_5, 2020/01

https://doi.org/10.1016/j.physletb.2019.135096
 被引用回数：15 パーセンタイル：75.18(Astronomy & Astrophysics)

Fine structure in the $$alpha$$ decay of $$^{223}$$U was observed in the fusion-evaporation reaction $$^{187}$$Re($$^{40}$$Ar,p3n) by using fast digital pulse processing technique. Two $$alpha$$-decay branches of $$^{223}$$U feeding the ground state and 244 keV excited state of $$^{219}$$Th were identified by establishing the decay chain $$^{223}$$U$$rightarrow$$$$^{219}$$Th$$rightarrow$$$$^{215}$$Ra$$rightarrow$$$$^{211}$$Rn. The $$alpha$$-particle energy for the ground-state to ground-state transition of $$^{223}$$U was determined to be 8993(17) keV, 213 keV higher than the previous value, the half-life was updated to be 62$$^{+14}_{-10} mu$$s. Evolution of nuclear structure for $$N$$=131 even-$$Z$$ isotones from Po to U was discussed in the frameworks of nuclear mass and reduced $$alpha$$-decay width, a weakening octupole deformation in the ground state of $$^{223}$$U relative to its lighter isotones $$^{219}$$Ra and $$^{211}$$Th was suggested.

論文

Nuclear structure of $$^{76}$$Ni from the ($$p$$,$$2p$$) reaction

Elekes, Z.*; Kripk$'o$, $'A$*; Sohler, D.*; Sieja, K.*; 緒方 一介*; 吉田 数貴; Doornenbal, P.*; Obertelli, A.*; Authelet, G.*; 馬場 秀忠*; et al.

Physical Review C, 99(1), p.014312_1 - 014312_7, 2019/01

https://doi.org/10.1103/PhysRevC.99.014312
 被引用回数：14 パーセンタイル：71.51(Physics, Nuclear)

($$p$$,$$2p$$)反応による$$^{76}$$Niの核構造の探索実験を行った。Lenzi, Nowacki, Poves, Sieja相互作用を用いた殻模型計算では実験結果を説明しうる陽子空孔状態が得られており、理論的な断面積計算は実験値とよい一致を与えた。実験で得られたすべての状態を理論的に一意に決定することはできなかったが、過去の実験結果と同様にNi同位体でのZ = 28の大きなshell gapを示す結果が得られた。

論文

Shell evolution beyond $$Z$$=28 and $$N$$=50; Spectroscopy of $$^{81,82,83,84}$$Zn

Shand, C. M.*; Podoly$'a$k, Zs.*; G$'o$rska, M.*; Doornenbal, P.*; Obertelli, A.*; Nowacki, F.*; Otsuka, T.*; Sieja, K.*; Tostevin, J. A.*; Tsunoda, T.*; et al.

Physics Letters B, 773, p.492 - 497, 2017/10

https://doi.org/10.1016/j.physletb.2017.09.001
 被引用回数：33 パーセンタイル：88.77(Astronomy & Astrophysics)

Low-lying states in neutron-rich $$^{81,82.83.84}$$Zn nuclei were measured for the first time via in-beam $$gamma$$-ray spectroscopy at RIKEN. These include the 4$$_1^+$$ to 2$$_1^+$$ in $$^{82}$$Zn and the 2$$_1^+$$ to 0$$_1^+$$ and 4$$_1^+$$ to 2$$_1^+$$ in $$^{84}$$Zn. The reduced E($$2^+$$) energies and increased E(4$$^+$$)/E(2$$^+$$) ratios at $$N$$=52,54 compared to $$^{80}$$Zn attest that the magicity is confined just on the neutron number $$N$$=50 only. The levels observed in $$^{84}$$Zn suggest the onset of deformation towards heavier Zn isotopes. The data were compared to state-of-the-art shell model calculations.

論文

Uniaxial pressure effect on the magnetic ordered moment and transition temperatures in BaFe$$_{2-x}$$T$$_{x}$$As$$_{2}$$ ($$T$$ = 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：65.86(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$$_2$$, and a 15% increase for BaFe$$_{1.915}$$Ni$$_{0.085}$$As$$_2$$. We also observe an increase of the AF ordering temperature ($$T_N$$) 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

Strain and magnetic-field characterization of a bronze-route Nb$$_3$$Sn ITER wire; Benchmarking of strain measurement facilities at NIST and University of Twente

Cheggour, N.*; Nijhuis, A.*; Krooshoop, H. J. G.*; Lu, X. F.*; Splett, J.*; Stauffer, T. C.*; Goodrich, L. F.*; Jewell, M. C.*; Devred, A.*; 名原 啓博

IEEE Transactions on Applied Superconductivity, 22(3), p.4805104_1 - 4805104_4, 2012/06

https://doi.org/10.1109/TASC.2011.2177433
 被引用回数：10 パーセンタイル：48.15(Engineering, Electrical & Electronic)

ITER用ブロンズ法Nb$$_3$$Sn素線の4.2Kにおける臨界電流を、軸方向歪みと磁束密度を関数としてNISTとTwente大学でそれぞれ測定し、ベンチマーク試験を行った。NISTはWalters' spring歪み印加装置を、Twente大学ではPacman歪み印加装置を使って測定した。このITER用ブロンズ法素線は非常に高い可逆限界歪みを持っているので、$$-1%$$から$$+1%$$までの広い歪み範囲で測定データの比較が可能である。本稿では、各装置での測定データとそれらの比較を行い、また、測定方法やフィッティング関数のパラメータ決定方法に関しても議論する。

論文

Electron acceleration via high contrast laser interacting with submicron clusters

Zhang, L.*; Chen, L.-M.*; Wang, W.-M.*; Yan, W.-C.*; Yuan, D.-W.*; Mao, J.-Y.*; Wang, Z.-H.*; Liu, C.*; Shen, Z.-W.*; Faenov, A. Ya.; et al.

Applied Physics Letters, 100(1), p.014104_1 - 014104_3, 2012/01

https://doi.org/10.1063/1.3673911
 被引用回数：31 パーセンタイル：72.85(Physics, Applied)

Experimentally investigated electron acceleration from submicron size Ar clusters-gas target irradiated by a 100 fs, 10 TW laser pulse having a high-contrast. Electron beams are observed in the longitudinal and transverse directions to the laser propagation. The measured energy of the longitudinal electron reaches 0.6 GeV and the charge of the electron beam in the transverse direction is more than 3 nC. A two-dimensional particle-in-cell simulation of the interaction has been performed and it shows an enhancement of electron charge by using the cluster-gas target.

論文

Enhanced K$$alpha$$ output of Ar and Kr using size optimized cluster target irradiated by high-contrast laser pulses

Zhang, L.*; Chen, L.-M.*; Yuan, D.-W.*; Yan, W.-C.*; Wang, Z.-H.*; Liu, C.*; Shen, Z.-W.*; Faenov, A.*; Pikuz, T. A.; Skobelev, I.*; et al.

Optics Express (Internet), 19(25), p.25812 - 25822, 2011/12

https://doi.org/10.1364/OE.19.025812
 被引用回数：37 パーセンタイル：81.86(Optics)

It was observed that increasing the clusters size and laser pulse contrast can enhance the X-ray flux emitted by femtosecond-laser-driven-cluster plasma. By focusing a high contrast laser (10$$^{-10}$$) on large argon and Kr clusters, high flux K-shell X-rays is generated with record conversion efficiency. Using this X-ray source, a single-shot high-performance X-ray imaging is demonstrated.

論文

Angle-resolved photoemission spectroscopy study of PrFeAsO$$_{0.7}$$; Comparison with LaFePO

西 一郎*; 石角 元志; 出田 真一郎*; Malaeb, W.*; 吉田 鉄平*; 藤森 淳*; 小谷 佳範*; 久保田 正人*; 小野 寛太*; Yi, M.*; et al.

Physical Review B, 84(1), p.014504_1 - 014504_5, 2011/07

https://doi.org/10.1103/PhysRevB.84.014504
 被引用回数：22 パーセンタイル：63.07(Materials Science, Multidisciplinary)

鉄系超伝導体PrFeAsO$$_{0.7}$$の角度分解光電子分光の研究を行い、フェルミ準位付近のフェルミ面とバンド分散を調べた。へき開表面の極性により激しくホールドープされた電子状態が観測された。しかしながら、われわれはバンド幅を約2.5倍減少させ化学ポテンシャルを70meV下げるとLDAの計算と合うことを見いだした。これまでに報告されているLaFePOと比較することで、$$d$$$$_{3z^{2}-r^{2}}$$と$$yz,zx$$によるバンドのエネルギー位置が両者で非常に大きく異なることがわかった。このことはLDA計算で予言されているように異なるニクトゲン高さに起因する。

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