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SR studies and charge-spin percolation modelSheng, 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
Se
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 
0.45 followed by the AFM to paramagnetic metal (PMM) transition at 1.0. Among a few other Mott systems which exhibit similar two-step transitions, Ni(S,Se) 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.
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
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.
output of Ar and Kr using size optimized cluster target irradiated by high-contrast laser pulsesZhang, 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
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
) 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.
Chen, L. M.*; Wang, W. M.*; 神門 正城; Hudson, L. T.*; Liu, F.*; Lin, X. X.*; Ma, J. L.*; Li, Y. T.*; Bulanov, S. V.; 田島 俊樹*; et al.
Nuclear Instruments and Methods in Physics Research A, 619, p.128 - 132, 2010/07
被引用回数：10 パーセンタイル：54.66(Instruments & Instrumentation)イメージング応用、特にX線変換効率が飽和する領域での画像品質に与える影響についてレーザー駆動の硬X線源についてレビューを行う。高コントラストのレーザーを用いることで固体薄膜から発生するX線への変換効率は改善し、また、イメージングの応用によってX線スペクトルの形状は最適化できる。さらにArガスを用いることで、不要なバックグラウンドを低減でき、高品質の画像をとることができる。これらの方法はシングルショットでの高速X線イメージングを可能にする技術である。
-shell X-ray source from laser-driven Ar clustersChen, L. M.*; Liu, F.*; Wang, W. M.*; 神門 正城; Mao, J. Y.*; Zhang, L.*; Ma, J.*; Li, Y. T.*; Bulanov, S. V.; 田島 俊樹; et al.
Physical Review Letters, 104(21), p.215004_1 - 215004_4, 2010/05
被引用回数：74 パーセンタイル：89.79(Physics, Multidisciplinary)Bright Ar quasimonochromatic -shell X-ray with very little background has been generated using an Ar clustering gas jet target irradiated with a 30 fs ultrahigh-contrast laser, with a measured flux of 2.2
10
photons/J into 4
. This intense X-ray source critically depends on the laser contrast and intensity. The optimization of source output with interaction length is addressed. Simulations point to a nonlinear resonant mechanism of electron heating during the early stage of laser interaction, resulting in enhanced X-ray emission. The X-ray pulse duration is expected to be only 10 fs, opening the possibility for single- shot ultrafast keV X-ray imaging applications.
Chen, L.-M.; 神門 正城; Xu, M. H.*; Li, Y.-T.*; Koga, J. K.; Chen, M.*; Xu, H.*; Yuan, X.-H.*; Dong, Q. L.*; Sheng, Z. M.*; et al.
Physical Review Letters, 100(4), p.045004_1 - 045004_4, 2008/02
被引用回数：102 パーセンタイル：92.75(Physics, Multidisciplinary)60fsのレーザーパルスの2倍高調波を銅薄膜に照射したときにK X線の変換効率が基本波に比べて増大することを発見した。変換効率は、レーザーパルスを非線形に歪めた形状に強く依存することがわかった。変換効率は、100fsに負のチャープを与えた場合に最大となった。電子エネルギースペクトルの構造化が変換効率の増大に寄与している。シミュレーションにより、強調されたvacuum heatingの機構により高コントラストレーザーはX線発生の効率化の有用なツールであることを示した。
