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Revising the 4${it f}$ symmetry in CeCu$$_{2}$$Ge$$_{2}$$; Soft X-ray absorption and hard X-ray photoemission spectroscopy

荒谷 秀和*; 中谷 泰博*; 藤原 秀紀*; 川田 萌樹*; 金井 惟奈*; 山神 光平*; 藤岡 修平*; 濱本 諭*; 久我 健太郎*; 木須 孝幸*; et al.

Physical Review B, 98(12), p.121113_1 - 121113_6, 2018/09

 被引用回数:1 パーセンタイル:59.26(Materials Science, Multidisciplinary)

We present a detailed study on the $$4f$$ ground state symmetry of the pressure-induced superconductor CeCu$$_2$$Ge$$_2$$ probed by soft X-ray absorption and hard X-ray photoemission spectroscopy. The revised Ce $$4f$$ ground states are determined as $$|{Gamma_7}rangle=sqrt{0.45}|{J_{z}=pm frac{5}{2}}rangle - sqrt{0.55}|{mp frac{3}{2}}rangle$$ with $$Sigmamathchar`-{rm type}$$ in-plane rotational symmetry. This gives an in-plane magnetic moment consistent with the antiferromagnetic moment as reported in neutron measurements. Since the in-plane symmetry is the same as that for the superconductor CeCu$$_2$$Si$$_2$$, we propose that the charge distribution along the $$c$$-axis plays an essential role in driving the system into a superconducting phase.


$$^{61}$$Ni synchrotron radiation-based M$"o$ssbauer spectroscopy of nickel-based nanoparticles with hexagonal structure

増田 亮*; 小林 康浩*; 北尾 真司*; 黒葛 真行*; 齋藤 真器名*; 依田 芳卓*; 三井 隆也; 細井 浩平*; 小林 浩和*; 北川 宏*; et al.

Scientific Reports (Internet), 6, p.20861_1 - 20861_8, 2016/02

 被引用回数:5 パーセンタイル:50.18(Multidisciplinary Sciences)

We measured the SR M$"o$ssbauer spectra of Ni nanoparticles with a hexagonal structure that were synthesized by chemical reduction. To obtain M$"o$ssbauer spectra of the nanoparticles without 61-Ni enrichment, we developed a measurement system for $$^{61}$$Ni SR M$"o$ssbauer absorption spectroscopy without X-ray windows between the standard energy alloy and detector. The counting rate of the $$^{61}$$Ni nuclear resonant scattering in the system was enhanced by the detection of internal conversion electrons and the close proximity between the energy standard and the detector. The spectrum measured at 4 K revealed the internal magnetic field of the nanoparticles was 3.4 T, corresponding to a Ni atomic magnetic moment of 0.3 Bohr magneton. This differs from the value of Ni$$_{3}$$C and the theoretically predicted value of hexagonal closed packed Ni and suggested the nanoparticle possessed intermediate carbon content between hcp-Ni and Ni$$_{3}$$C of approximately 10 atomic percent of Ni.


Probing strongly correlated 4$$f$$-orbital symmetry of the ground state in Yb compounds by linear dichroism in core-level photoemission

森 健雄*; 北山 賢*; 金井 惟奈*; 内免 翔*; 藤原 秀紀*; 東谷 篤志*; 玉作 賢治*; 田中 新*; 寺嶋 健成*; 今田 真*; et al.

Journal of the Physical Society of Japan, 83(12), p.123702_1 - 123702_5, 2014/12

 被引用回数:11 パーセンタイル:28.13(Physics, Multidisciplinary)



Development of $$^{125}$$Te synchrotron-radiation-based M$"o$ssbauer spectroscopy

黒葛 真行*; 北尾 真司*; 小林 康浩*; 齋藤 真器名*; 増田 亮*; 三井 隆也; 依田 芳卓*; 瀬戸 誠*

Hyperfine Interactions, 226(1), p.687 - 691, 2014/04

 被引用回数:2 パーセンタイル:30.92

The M$"o$ssbauer spectra of the 35.49 keV excited state of $$^{125}$$Te were observed in the energy domain using synchrotron radiation for the first time. The obtained isomer shifts and Debye temperature agree with previous experiments. These results show that this method will be applicable to various compounds.


$$^{125}$$Te synchrotron-radiation-based M$"o$ssbauer spectroscopy of Fe$$_{1.1}$$Te and FeTe$$_{0.5}$$Se

黒葛 真行*; 北尾 真司*; 小林 康浩*; 齋藤 真器名*; 増田 亮*; 三井 隆也; 依田 芳卓*; 瀬戸 誠*

Journal of the Physical Society of Japan, 83(4), p.044708_1 - 044708_4, 2014/04

 パーセンタイル:100(Physics, Multidisciplinary)

The $$^{125}$$Te M$"o$ssbauer spectra of Fe$$_{1.1}$$Te and FeTe$$_{0.5}$$Se$$_{0.5}$$ were measured using synchrotron-radiation-based M$"o$ssbauer spectroscopy. The hyper fine field of Te in the antiferromagnetic phase of Fe$$_{1.1}$$Te was evaluated to be 4(1) T at 20 K, and this hyper fine field is considered to be due to the transferred hyper fine field from Fe magnetic moments. The evaluated hyper fine field was comparatively large, suggesting the strong correlation with the magnetic moment of Fe that forms double stripe type magnetic structure. For the superconductor FeTe$$_{0.5}$$Se$$_{0.5}$$, no marked change in its M$"o$ssbauer parameters was observed below or above the superconducting transition temperature, indicating that the change in the electronic state of Te was small.


Synchrotron radiation-based M$"o$ssbauer spectra of $$^{174}$$Yb measured with internal conversion electrons

増田 亮*; 小林 康浩*; 北尾 真司*; 黒葛 真行*; 齋藤 真器名*; 依田 芳卓*; 三井 隆也; 伊賀 文俊*; 瀬戸 誠

Applied Physics Letters, 104(8), p.082411_1 - 082411_5, 2014/02

 被引用回数:9 パーセンタイル:45.24(Physics, Applied)



Compact XFEL and AMO sciences; SACLA and SCSS

矢橋 牧名*; 田中 均*; 田中 隆次*; 冨澤 宏光*; 富樫 格*; 永園 充*; 石川 哲也*; Harries, J.; 彦坂 泰正*; 菱川 明栄*; et al.

Journal of Physics B; Atomic, Molecular and Optical Physics, 46(16), p.164001_1 - 164001_19, 2013/08

 被引用回数:56 パーセンタイル:3.09(Optics)

The concept, design, and performance of Japan's compact FEL facilities, the SPring-8 Compact SASE Source test accelerator (SCSS) and SPring-8 Angstrom Compact free electron LAser (SACLA), and their applications are reviewed. At SCSS, intense, ultrafast FEL pulses at extreme ultraviolet (EUV) wavelengths have been utilized for investigating various multiphoton processes in atoms, molecules and clusters by means of ion and electron spectroscopy. The quantum optical effect superfluorescence has been observed with EUV excitation. A pump-probe technique combining FEL pulses with near infrared laser pulses has been realized to study the ultrafast dynamics of atoms, molecules and clusters in the sub-picosecond regime. At SACLA, deep inner-shell multiphoton ionization by intense X-ray free-electron laser pulses has been investigated. The development of seeded FEL sources for producing transversely and temporally coherent light, as well as the expected impact on advanced science are discussed.


High-resolution photoemission study of the hybridization gap in the Kondo semiconductor CeRhAs

島田 賢也*; 東口 光晴*; 有田 将司*; 生天目 博文*; 谷口 雅樹*; 藤森 伸一; 斎藤 祐児; 藤森 淳; 高田 恭孝*; Shin, S.*; et al.

Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.e57 - e58, 2007/03



$$^{57}$$Fe nuclear resonant inelastic scattering of iron based superconductor, FeTe$$_x$$Se$$_{1-x}$$

黒葛 真行*; 北尾 真司*; 小林 康浩*; 齋藤 真器名*; 増田 亮; 三井 隆也; 依田 芳卓*; 瀬戸 誠*

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