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Journal Articles

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

Masuda, Ryo*; Kobayashi, Yasuhiro*; Kitao, Shinji*; Kurokuzu, Masayuki*; Saito, Makina*; Yoda, Yoshitaka*; Mitsui, Takaya; Hosoi, Kohei*; Kobayashi, Hirokazu*; Kitagawa, Hiroshi*; et al.

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

 Times Cited Count:6 Percentile:37.08(Multidisciplinary Sciences)

Journal Articles

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

Kurokuzu, Masayuki*; Kitao, Shinji*; Kobayashi, Yasuhiro*; Saito, Makina*; Masuda, Ryo*; Mitsui, Takaya; Yoda, Yoshitaka*; Seto, Makoto*

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

 Times Cited Count:3 Percentile:73.69

Journal Articles

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

Kurokuzu, Masayuki*; Kitao, Shinji*; Kobayashi, Yasuhiro*; Saito, Makina*; Masuda, Ryo*; Mitsui, Takaya; Yoda, Yoshitaka*; Seto, Makoto*

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

 Times Cited Count:1 Percentile:13.18(Physics, Multidisciplinary)

Journal Articles

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

Masuda, Ryo*; Kobayashi, Yasuhiro*; Kitao, Shinji*; Kurokuzu, Masayuki*; Saito, Makina*; Yoda, Yoshitaka*; Mitsui, Takaya; Iga, Fumitoshi*; Seto, Makoto

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

 Times Cited Count:14 Percentile:58.55(Physics, Applied)

A detection system for synchrotron-radiation (SR)-based M$"o$ssbauer spectroscopy was developed to enhance the nuclear resonant scattering counting rate and thus increase the available nuclides. In the system, a windowless avalanche photodiode (APD) detector was combined with a vacuum cryostat to detect the internal conversion (IC) electrons and fluorescent X-rays accompanied by nuclear de-excitation. As a feasibility study, the SR-based M$"o$ssbauer spectrum using the 76.5 keV level of $$^{174}$$Yb was observed without $$^{174}$$Yb enrichment of the samples. The counting rate was five times higher than that of our previous system, and the spectrum was obtained within 10 h. This result shows that nuclear resonance events can be more efficiently detected by counting IC electrons for nuclides with high IC coefficients. Furthermore, the windowless detection system enables us to place the sample closer to the APD elements and is advantageous for nuclear resonant inelastic scattering measurements. Therefore, this detection system can not only increase the number of nuclides accessible in SR-based M$"o$ssbauer spectroscopy but also allows the nuclear resonant inelastic scattering measurements of small single crystals or enzymes with dilute probe nuclides that are difficult to measure with the previous detection system.

Oral presentation

I-127 nuclear resonant quasi-elastic scattering from a potassium iodide aqueous solution

Haruki, Rie; Imai, Yasuhiko*; Koshimizu, Masanori*; Nishikido, Fumihiko*; Shibuya, Kengo*; Kurokuzu, Masayuki*; Yoda, Yoshitaka*; Kishimoto, Shunji*

no journal, , 

no abstracts in English

Oral presentation

Diffusive motion of atoms in a solution studied by nuclear resonant scattering

Haruki, Rie; Imai, Yasuhiko*; Yoda, Yoshitaka*; Koshimizu, Masanori*; Nishikido, Fumihiko*; Shibuya, Kengo*; Kurokuzu, Masayuki*; Kishimoto, Shunji*

no journal, , 

Oral presentation

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

Kurokuzu, Masayuki*; Kitao, Shinji*; Kobayashi, Yasuhiro*; Saito, Makina*; Masuda, Ryo; Mitsui, Takaya; Yoda, Yoshitaka*; Seto, Makoto*

no journal, , 

FeTe$$_x$$Se$$_{1-x}$$ consists of only the superconducting layer of iron and chalcogenides and is one of the simplest iron-based superconductor. We measured the nuclear resonant inelastic scattering by $$^{57}$$Fe in FeTe$$_{0.5}$$Se$$_{0.5}$$ and FeTe$$_{0.9}$$, to observe the temperature dependence of their phonon density of states (PDOS); FeTe$$_{0.5}$$Se$$_{0.5}$$ has the highest superconducting temperature (T$$_c$$) among FeTe$$_x$$Se$$_{1-x}$$ and the non-superconducting FeTe$$_{0.9}$$ is the base material of FeTe$$_x$$Se$$_{1-x}$$. The difference between the PDOS of FeTe$$_{0.5}$$Se$$_{0.5}$$ at temperatures below and above T$$_c$$ is unclear. This indicates the phonons are not the main contribution to the superconductivity. On the other hand, the PDOS of FeTe$$_{0.9}$$ changes depending on temperature and this change is understood by the results of the structural phase transition.

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