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Nagao, Michihiro*; Kelley, E. G.*; Faraone, A.*; Saito, Makina*; Yoda, Yoshitaka*; Kurokuzu, Masayuki*; Takata, Shinichi; Seto, Makoto*; Butler, P. D.*
Physical Review Letters, 127(7), p.078102_1 - 078102_7, 2021/08
Times Cited Count:21 Percentile:88.76(Physics, Multidisciplinary)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:9 Percentile:40.28(Multidisciplinary Sciences)Mibu, Ko*; Mitsui, Takaya; Tanaka, Masaaki*; Masuda, Ryo*; Kitao, Shinji*; Kobayashi, Yasuhiro*; Yoda, Yoshitaka*; Seto, Makoto*
Journal of Applied Physics, 117(17), p.17E126_1 - 17E126_4, 2015/05
Times Cited Count:2 Percentile:9.01(Physics, Applied)Mitsui, Takaya; Imai, Yasuhiko*; Masuda, Ryo*; Seto, Makoto*; Mibu, Ko*
Journal of Synchrotron Radiation, 22(2), p.427 - 435, 2015/03
Times Cited Count:11 Percentile:52.37(Instruments & Instrumentation)Mashimo, Izumi*; Otani, Eiji*; Hirao, Naohisa*; Mitsui, Takaya; Masuda, Ryo*; Seto, Makoto*; Sakai, Takeshi*; Takahashi, Suguru*; Nakano, Satoshi*
American Mineralogist, 99(8-9), p.1555 - 1561, 2014/08
Times Cited Count:7 Percentile:23.61(Geochemistry & Geophysics)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:69.58(Physics, Atomic, Molecular & Chemical)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:3 Percentile:28.07(Physics, Multidisciplinary)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:21 Percentile:64.83(Physics, Applied)A detection system for synchrotron-radiation (SR)-based Mssbauer 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
ssbauer spectrum using the 76.5 keV level of
Yb was observed without
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
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.
Mitsui, Takaya; Masuda, Ryo*; Seto, Makoto; Hirao, Naohisa*; Matsuoka, Takehiro*; Nakamura, Yumiko*; Sakaki, Koji*; Enoki, Hirotoshi*
Journal of Alloys and Compounds, 580(Suppl.1), p.S264 - S267, 2013/12
Times Cited Count:8 Percentile:42.44(Chemistry, Physical)Mitsui, Takaya; Masuda, Ryo; Hirao, Naohisa*; Mibu, Ko*; Seto, Makoto
Hyperfine Interactions, 204(1-3), p.97 - 100, 2012/04
Times Cited Count:4 Percentile:87.07(Physics, Atomic, Molecular & Chemical)Masuda, Ryo; Mitsui, Takaya; Ito, Keiji*; Sakaki, Koji*; Enoki, Hirotoshi*; Nakamura, Yumiko*; Seto, Makoto
Hyperfine Interactions, 204(1-3), p.139 - 142, 2012/03
Times Cited Count:2 Percentile:76.72(Physics, Atomic, Molecular & Chemical)We have been developing a system for in situ Mssbauer studies using synchrotron radiation (SR) to elucidate the mechanism of hydrogenation processes. In the system, samples reacts in an atmosphere chamber and SR-based M
ssbauer spectra using variable-frequency nuclear monochromator and energy spectra of inelastic nuclear resonant scattering (NRS) of SR are measured. As a feasibility study, the temperature dependence of the M
ssbauer and inelastic NRS spectra of
Fe in
-GdFe
H
under vacuum were measured. In both spectra, clear differences were observed between 373 K and 573 K. These differences can be interpreted by the change of microscopic environment around Fe at the dehydrogenation. Thus, it is confirmed that this system works well enough to perform the in-situ M
ssbauer study on the dehydrogenation of
-GdFe
H
.
Mitsui, Takaya; Masuda, Ryo*; Seto, Makoto; Suharyadi, E.*; Mibu, Ko*
Journal of Synchrotron Radiation, 19(2), p.198 - 204, 2012/03
Times Cited Count:20 Percentile:67.97(Instruments & Instrumentation)An energy-domain grazing-incidence Fe-M
ssbauer spectroscopy(E-GIMS) with synchrotron radiation (SR) has been developed to studysurface and interface structures of thin films. A high-brilliant
Fe-M
ssbauer radiation, filtered from SR by a
FeBO
single crystal nuclear Bragg monochromator (NBM), allows us to perform the conventional M
ssbauer spectroscopy (MS) for the dilute
Fe in a mirror-like film in any bunch-mode operation of SR. Theoretical and experimental study of the specular reflections from isotope-enriched (
Fe: 95%) and natural-abundance (
Fe:
2%) iron thin films has been carried out to clarify the basic features of coherent interference between electronic and nuclear resonant scattering of
Fe-Mo"ssbauer radiation in thin films. Moreover, a new surface and interface sensitive method has been developed by the combination of SR based E-GIMS and
Fe-probe layer technique, which enables us to probe interfacial complex magnetic structures in thin film with atomic-scale depth resolution.
Masuda, Ryo; Mitsui, Takaya; Ito, Keiji*; Kobayashi, Yasuhiro*; Kitao, Shinji*; Seto, Makoto
Journal of the Physical Society of Japan, 81(3), p.034714_1 - 034714_6, 2012/03
Times Cited Count:3 Percentile:26.55(Physics, Multidisciplinary)Matsuoka, Takahiro*; Fujihisa, Hiroshi*; Hirao, Naohisa*; Oishi, Yasuo*; Mitsui, Takaya; Masuda, Ryo; Seto, Makoto*; Yoda, Yoshitaka*; Shimizu, Katsuya*; Machida, Akihiko; et al.
Physical Review Letters, 107(2), p.025501_1 - 025501_4, 2011/07
Times Cited Count:29 Percentile:78.06(Physics, Multidisciplinary)Europium-hydride EuH exposed to high-pressure H
conditions has been found to exhibit structural and valence changes,
(
=2, divalent)
63/
(
=2, 7.2-8.7 GPa)
4/
(
2, 8.7-9.7 GPa)
4/
(
2, 9.7 GPa-, trivalent). Having trivalent character and distorted cubic fcc structure, the
4/
structure is the
-phase which has been commonly observed for other rare-earth metal hydrides. Our study clearly demonstrates that EuH
is no longer an "irregular" member of the rare earth metal hydrides.
Masuda, Ryo; Mitsui, Takaya; Kobayashi, Yasuhiro*; Higashitaniguchi, Satoshi*; Seto, Makoto
Japanese Journal of Applied Physics, 48(12), p.120221_1 - 120221_3, 2009/12
Times Cited Count:8 Percentile:33.25(Physics, Applied)A neV-resolution spectrometer using 14.4 keV synchrotron-based Fe M
ssbauer radiation has been developed to observe the quasi-elastic scattering by condensed matter. It consists of a
Fe
O
nuclear resonant Bragg monochromator and a
Fe stainless steel nuclear analyzer. As a feasibility study, the quasi-elastic scattering by supercooled glycerol near its melting point has been observed. The instrumental function of the spectrometer was 42.2 neV. The energy broadening of 11 neV due to the quasi-elastic scattering was observed.
Seto, Makoto; Masuda, Ryo; Higashitaniguchi, Satoshi*; Kitao, Shinji*; Kobayashi, Yasuhiro*; Inaba, Chika*; Mitsui, Takaya; Yoda, Yoshitaka*
Physical Review Letters, 102(21), p.217602_1 - 217602_4, 2009/05
Times Cited Count:57 Percentile:87.99(Physics, Multidisciplinary)We have developed a new method that yields Mssbauer absorption spectra using synchrotron radiation (SR); this method is applicable for almost all M
ssbauer nuclides including those that cannot be measured by previous methods using radioisotope (RI) sources. The M
ssbauer spectrum of the 68.752 keV excited state of
Ge, which cannot be measured using a RI source, was measured using SR. Our results show that this method can be used to perform advanced M
ssbauer spectroscopy measurements owing to the excellent features of SR.
Masuda, Ryo; Mitsui, Takaya; Kitao, Shinji*; Higashitaniguchi, Satoshi*; Yoda, Yoshitaka*; Seto, Makoto
Japanese Journal of Applied Physics, 47(10), p.8087 - 8090, 2008/10
Times Cited Count:12 Percentile:44.45(Physics, Applied)A synchrotron-radiation-based neV-resolution spectrometer has been developed using single-line pure nuclear Bragg reflection. The developed optical system consists of two components: a FeBO
single crystal near the N
el temperature for producing
Fe M
ssbauer radiation from synchrotron radiation, and a single-line M
ssbauer absorber (
Fe-enriched stainless steel foil) for analyzing the energy distribution. As a feasibility study, we have performed the measurement of the M
ssbauer radiation diffracted by a Si crystal under ultrasound vibration with the optical system and have successfully observed the neV-range energy modulation due to the ultrasound vibration.
Mitsui, Takaya; Seto, Makoto; Masuda, Ryo; Kobayashi, Yasuhiro*; Kitao, Shinji*
Japanese Journal of Applied Physics, 47(9), p.7136 - 7139, 2008/10
Times Cited Count:7 Percentile:29.94(Physics, Applied)no abstracts in English
Mitsui, Takaya; Seto, Makoto; Masuda, Ryo
Japanese Journal of Applied Physics, Part 2, 46(38), p.L930 - L932, 2007/10
Times Cited Count:17 Percentile:54.86(Physics, Applied)A variable-frequency Fe nuclear monochromator has been developed using a pure nuclear Bragg reflection from an oscillating
FeBO
single crystal at the N
el temperature. The Doppler-shifted single-line
Fe M
ssbauer radiation at a fixed beam position was successfully filtered using the third-generation synchrotron radiation (SR) of SPring-8. We describe the principle of the variable-frequency M
ssbauer filtering technique, the study on the beam characteristics, and some demonstrative experiments on energy-domain SR M
ssbauer spectroscopy.
Mitsui, Takaya; Seto, Makoto; Masuda, Ryo; Kiriyama, Koji; Kobayashi, Yasuhiro*
Japanese Journal of Applied Physics, Part 2, 46(28), p.L703 - L705, 2007/07
Times Cited Count:17 Percentile:54.86(Physics, Applied)Synchrotron radiation Mssbauer spectroscopy was performed using a pure nuclear Bragg reflection of a
FeBO
singlecrystal at the N
el temperature and a Bragg reflection of an oscillating Si single crystal. The developed optical systemfor nuclear diffraction could produce a Doppler-shifted 14.4 keV single-line
Fe-M
ssbauer radiation and it enabled us to observe the energy-domain synchrotron radiation M
ssbauer spectrum with an absorber at rest.