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Journal Articles

M$"o$ssbauer and magnetic study of neptunyl(+1) complexes

Nakamoto, Tadahiro*; Nakamura, Akio; Takeda, Masuo*

M$"o$ssbauer Spectroscopy; Applications in Chemistry, Biology, and Nanotechnology, p.95 - 114, 2013/10

https://doi.org/10.1002/9781118714614.ch05

Journal Articles

Lanthanides ($$^{151}$$Eu and $$^{155}$$Gd)-M$"o$ssbauer spectroscopic study of defect-fluorite oxides coupled with new defect crystal chemistry model

Nakamura, Akio; Igawa, Naoki; Okamoto, Yoshihiro; Hinatsu, Yukio*; Wang, J.*; Takahashi, Masashi*; Takeda, Masuo*

M$"o$ssbauer Spectroscopy; Applications in Chemistry, Biology, and Nanotechnology, p.71 - 94, 2013/10

https://doi.org/10.1002/9781118714614.ch04

Journal Articles

Defect-fluorite oxides; Ln (Eu and Gd) M$"o$ssbauer study coupled with new defect-crystal-chemistry model

Nakamura, Akio; Igawa, Naoki; Okamoto, Yoshihiro; Wang, J.*; Hinatsu, Yukio*; Takahashi, Masashi*; Takeda, Masuo*

Hyperfine Interactions, 217(1-3), p.17 - 26, 2013/04

https://doi.org/10.1007/s10751-012-0654-z
 Times Cited Count：1 Percentile：52.83(Physics, Atomic, Molecular & Chemical)

Journal Articles

The Structure, property and applications of defect fluorite oxides; M$"o$ssbauer, EXAFS and NMR studies coupled with new defect-crystal-chemistry model

Nakamura, Akio

Mesubaua Bunko Kenkyu, (14), p.8 - 11, 2013/00

I have recently proposed a new defect-crystal-chemistry model for coupled non-Vegardianity and non-random defect structure of so-called defect-fluorite oxides. In this lecture, I would like to give its review, emphasizing the importance of microscopic M$"o$ssbauer, EXAFS and NMR local-structure data in combination with XRD lattice parameter data.

Journal Articles

Single crystal growth and magnetic anisotropy of hexagonal PuGa$$_{3}$$

Haga, Yoshinori; Homma, Yoshiya*; Aoki, Dai*; Nakajima, Kunihisa; Arai, Yasuo; Matsuda, Tatsuma; Ikeda, Shugo*; Sakai, Hironori; Yamamoto, Etsuji; Nakamura, Akio; et al.

Journal of the Physical Society of Japan, 81(Suppl.B), p.SB007_1 - SB007_4, 2012/12

https://doi.org/10.1143/JPSJS.81SB.SB007
 Times Cited Count：0 Percentile：0(Physics, Multidisciplinary)

Journal Articles

$$^{155}$$Gd M$"o$ssbauer spectroscopic and powder X-ray diffraction study of CeO$$_{2}$$ - GdO$$_{1.5}$$ solid solution

Nakamura, Akio; Imai, Kazutaka*; Igawa, Naoki; Okamoto, Yoshihiro; Yamamoto, Etsuji; Matsukawa, Shiro*; Takahashi, Masashi*

Hyperfine Interactions, 207(1-3), p.67 - 71, 2012/03

https://doi.org/10.1007/s10751-011-0419-0
 Times Cited Count：4 Percentile：87.07(Physics, Atomic, Molecular & Chemical)

Journal Articles

Irradiation history of Itokawa regolith material deduced from noble gases in the Hayabusa samples

Nagao, Keisuke*; Okazaki, Ryuji*; Nakamura, Tomoki*; Miura, Yayoi*; Osawa, Takahito; Bajo, Kenichi*; Matsuda, Shintaro*; Ebihara, Mitsuru*; Ireland, T.*; Kitajima, Fumio*; et al.

Science, 333(6046), p.1128 - 1131, 2011/08

https://doi.org/10.1126/science.1207785
 Times Cited Count：130 Percentile：95.22(Multidisciplinary Sciences)

A steroid surface materials record regolith processes and a history of cosmic-ray irradiation. Noble gas isotopes in three rocky grains from Itokawa have been determined. High concentrations of solar He, Ne, and Ar, as high as those in lunar soils, are released at variable temperatures from each sample. The isotopic compositions are essentially identical to those of solar wind but distinguishable in He relative abundance. These noble gas characteristics can be explained by repeated implantation and preferential loss of solar He by removal of weathered He-rich rim on the grain surface through friction among regolith grains on Itokawa. Residence time of regolith materials on Itokawa is alculated to be shorter than 10 Myr, suggesting that regolith materials of small asteroids would escape easily to space.

Journal Articles

Crystal structure and physical properties of trigonal NpGa$$_3$$ and Np$$_{3}$$Ga$$_{11}$$

Haga, Yoshinori; Aoki, Dai*; Homma, Yoshiya*; Matsuda, Tatsuma; Ikeda, Shugo*; Sakai, Hironori; Yamamoto, Etsuji; Nakamura, Akio; Shiokawa, Yoshinobu*; Onuki, Yoshichika

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA109_1 - SA109_3, 2011/07

https://doi.org/10.1143/JPSJS.80SA.SA109
 Times Cited Count：0 Percentile：0(Physics, Multidisciplinary)

Journal Articles

New Defect-crystal-chemical approach to non-vegardianity and complex defect structure of fluorite-based MO$$_{2}$$-LnO$$_{1.5}$$ solid solutions (M$$^{4+}$$=Ce, Th; Ln$$^{3+}$$= Lanthanide), 2; Detailed local-structure and ionic-conductivity analysis

Nakamura, Akio

Solid State Ionics, 181(37-38), p.1631 - 1653, 2010/12

https://doi.org/10.1016/j.ssi.2010.09.022
 Times Cited Count：17 Percentile：58.6(Chemistry, Physical)

Journal Articles

New defect-crystal-chemical approach to non-Vegardianity and complex defect structure of fluorite-based MO$$_{2}$$-LnO$$_{1.5}$$ solid solutions (M$$^{4+}$$=Ce, Th; Ln$$^{3+}$$=Lanthanide), 1; Model description and lattice-parameter data analysis

Nakamura, Akio

Solid State Ionics, 181(35-36), p.1543 - 1564, 2010/11

https://doi.org/10.1016/j.ssi.2010.09.019
 Times Cited Count：25 Percentile：69.32(Chemistry, Physical)

Journal Articles

Magnetic and dielectric study of R$$_{0.5}$$Sr$$_{0.5}$$MnO$$_{3}$$ (R = Gd, Tb and Dy)

Yoshii, Kenji; Hiramitsu, Yusuke*; Okajima, Yuka*; Yoneda, Yasuhiro; Nishihata, Yasuo; Mizuki, Junichiro; Nakamura, Akio; Shimojo, Yutaka; Ishii, Yoshinobu*; Morii, Yukio; et al.

Materials Research Bulletin, 45(11), p.1574 - 1580, 2010/10

https://doi.org/10.1016/j.materresbull.2010.07.024
 Times Cited Count：12 Percentile：37.22(Materials Science, Multidisciplinary)

Magnetic and dielectric properties of perovskite manganites R$$_{0.5}$$Sr$$_{0.5}$$MnO$$_{3}$$ (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg about 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R$$^{3+}$$ and Sr$$^{3+}$$ settled randomly at the same crystallographic site. Dielectric constants for each material were about 1000-10000 between about 50 K and 300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this system are governed by the randomness at the R/Sr site. The tan$$delta$$ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.

Journal Articles

Magnetism and superconductivity in the new family of actinide compounds; AnPd$$_{5}$$Al$$_{2}$$

Haga, Yoshinori; Homma, Yoshiya*; Aoki, Dai*; Ikeda, Shugo*; Matsuda, Tatsuma; Tateiwa, Naoyuki; Yamamoto, Etsuji; Nakamura, Akio; Nakajima, Kenji; Arai, Yasuo; et al.

IOP Conference Series; Materials Science and Engineering, 9, p.012046_1 - 012046_7, 2010/05

https://doi.org/10.1088/1757-899X/9/1/012046
 Times Cited Count：0 Percentile：1.02(Chemistry, Inorganic & Nuclear)

Journal Articles

Heavy fermion state and quantum criticality

Onuki, Yoshichika; Settai, Rikio*; Honda, Fuminori*; Dung, N. D.*; Ishikura, Tatsuro*; Takeuchi, Tetsuya*; Matsuda, Tatsuma; Tateiwa, Naoyuki; Nakamura, Akio; Yamamoto, Etsuji; et al.

Physica B; Condensed Matter, 405(9), p.2194 - 2199, 2010/05

https://doi.org/10.1016/j.physb.2010.02.006
 Times Cited Count：1 Percentile：6.48(Physics, Condensed Matter)

Journal Articles

Possible existence of magnetic polaron in nearly ferromagnetic semiconductor $$beta$$-US$$_2$$

Ikeda, Shugo*; Sakai, Hironori; Tateiwa, Naoyuki; Matsuda, Tatsuma; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji; Nakamura, Akio; Shiokawa, Yoshinobu*; Ota, Yuki*; et al.

Journal of the Physical Society of Japan, 78(11), p.114704_1 - 114704_10, 2009/11

https://doi.org/10.1143/JPSJ.78.114704
 Times Cited Count：12 Percentile：59(Physics, Multidisciplinary)

Journal Articles

Element and orbital-specific observation of two-step magnetic transition in NpNiGa$$_5$$; X-ray magnetic circular dichroism study

Okane, Tetsuo; Okochi, Takuo*; Inami, Toshiya; Takeda, Yukiharu; Fujimori, Shinichi; Kawamura, Naomi*; Suzuki, Motohiro*; Tsutsui, Satoshi*; Yamagami, Hiroshi; Fujimori, Atsushi; et al.

Physical Review B, 80(10), p.104419_1 - 104419_7, 2009/09

https://doi.org/10.1103/PhysRevB.80.104419
 Times Cited Count：6 Percentile：29.51(Materials Science, Multidisciplinary)

Journal Articles

Hyperfine interactions in the itinerant system UFeGa$$_{5}$$

Kambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Chudo, Hiroyuki; Yasuoka, Hiroshi; Matsuda, Tatsuma; Haga, Yoshinori; Ikeda, Shugo; Nakamura, Akio; Yamamoto, Etsuji; et al.

Journal of Nuclear Materials, 385(1), p.1 - 3, 2009/03

https://doi.org/10.1016/j.jnucmat.2008.10.030
 Times Cited Count：1 Percentile：10.22(Materials Science, Multidisciplinary)

In 5f-electron systems, exotic magnetism and unconventional superconductivity appear at low temperatures owing to strong electron correlations and orbital degeneracy. For example, we have investigated the unconventional superconducting states of recently synthesized NpPd$$_5$$Al$$_2$$ ($$T_c$$=5K) and PuRhGa$$_5$$ ($$T_c$$=9K) in terms of both macroscopic (staticsusceptibility, specific heat, resistivity) and microscopic (NMR) probes. The relation between magnetic fluctuations and unconventional superconductivity in f-electron systems is also discussed. Another exciting topic concerns the series AnO$$_2$$ (An; U, Np, Pu, Am). Besides the importance of AnO$$_2$$ as a nuclear fuel, the magnetic properties of these compounds at low temperatures are particularly interesting. On the basis of $$^{17}$$O-NMR studies, multipolar ordered states have been identified in UO$$_2$$ (dipolar + quadrupolar ordering) and NpO$$_2$$ (quadrupolar + octupolar ordering), in contrast with the non-magnetic ground state of PuO$$_2$$.

Journal Articles

Crystal structure and magnetic properties of the new ternary actinide compounds AnPd$$_5$$Al$$_2$$ (An = U, Np)

Haga, Yoshinori; Aoki, Dai*; Homma, Yoshiya*; Ikeda, Shugo; Matsuda, Tatsuma; Yamamoto, Etsuji; Sakai, Hironori; Tateiwa, Naoyuki; Dung, N. D.*; Nakamura, Akio; et al.

Journal of Alloys and Compounds, 464(1-2), p.47 - 50, 2008/09

https://doi.org/10.1016/j.jallcom.2007.10.037
 Times Cited Count：19 Percentile：66.95(Chemistry, Physical)

Journal Articles

NMR investigation of quadrupole order parameter in actinide dioxides

Tokunaga, Yo; Homma, Yoshiya*; Kambe, Shinsaku; Aoki, Dai*; Sakai, Hironori; Chudo, Hiroyuki; Ikushima, Kenji*; Yamamoto, Etsuji; Nakamura, Akio; Shiokawa, Yoshinobu*; et al.

Journal of Optoelectronics and Advanced Materials, 10(7), p.1663 - 1665, 2008/07

Multipolar degrees of freedom characteristic of $$f$$-electrons bring rich and complex physics to rare-earth and actinide compounds. In the present work, we demonstrate that microscopic investigation of multipole order parameters is also possible by means of NMR through the hyperfine interactions. Our $$^{17}$$O NMR study performed on a single crystal of NpO$$_2$$ provide definitive support for the proposed longitudinal triple-$$q$$ type antiferro-octupolar ordering below $$T_0=$$26 K. We shall also provide our $$^{17}$$O NMR results on UO$$_2$$ and PuO$$_2$$. The microscopic NMR clearly indicates the different nature of the magnetic ground states among three actinide dioxides.

Journal Articles

Pressure effect on paramagnet $$beta$$-US$$_2$$

Ikeda, Shugo; Sakai, Hironori; Matsuda, Tatsuma; Tateiwa, Naoyuki; Nakamura, Akio; Yamamoto, Etsuji; Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu*; Hedo, Masato*; et al.

Physica B; Condensed Matter, 403(5-9), p.893 - 894, 2008/04

https://doi.org/10.1016/j.physb.2007.10.059
 Times Cited Count：6 Percentile：30.34(Physics, Condensed Matter)

Single crystals of paramagnetic semiconductor $$beta$$-US$$_2$$ with the orthorhombic ($textit{Pnma}$) crystal structure were grown by chemical transport method. We measured the electrical resistivity $$rho$$ under high pressure, and magnetization. With increasing pressure, the temperature dependence of $$rho$$ approaches to semimetallic behavior and a kink anomaly appears at $$T_{rm a}$$.$$T_{rm a}$$ shifts to higher temperature with increasing pressure. From the comparison with ferromagnetic semimetal UTeS having the same crystal structure, it seems that $$T_{rm a}$$ is a ferromagnetic transition.

Journal Articles

$$^{31}$$P-NMR study of the neptunium-based filled-skutterudite NpFe$$_4$$P$$_{12}$$

Tokunaga, Yo; Aoki, Dai*; Homma, Yoshiya*; Sakai, Hironori; Chudo, Hiroyuki; Kambe, Shinsaku; Matsuda, Tatsuma; Ikeda, Shugo; Yamamoto, Etsuji; Nakamura, Akio; et al.

Journal of the Physical Society of Japan, 77(Suppl.A), p.211 - 213, 2008/00

https://doi.org/10.1143/JPSJS.77SA.211
 Times Cited Count：3 Percentile：27.6(Physics, Multidisciplinary)

$$^{31}$$P-NMR measurements have been performed on a single crystal of NpFe$$_4$$P$$_{12}$$ which is the first crystallized transuranium filled-skutterudite compound. The field-orientation dependence of the hyperfine interaction has been measured using the single crystal, and the results compared with those obtained previously in isostructural compounds UFe$$_4$$P$$_{12}$$ and PrFe$$_4$$P$$_{12}$$. We have also measured the field and temperature dependence of the nuclear spin-lattice relaxation rate in several fields between 1.8 and 8 T at temperatures between 4.2 and 300 K. The results are discussed on the basis of a localized picture for the 5f electrons.

175 (Records 1-20 displayed on this page)