JAEA
  • help
  • PC | SP
  • JP | EN
          
Refine your search：     
Report No.
 - 
Clear All
Search Results: Records 1-9 displayed on this page of 9
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Visualization of anharmonic thermal vibration in filled skutterudite compounds

Kaneko, Koji; Metoki, Naoto; Kimura, Hiroyuki*; Noda, Yukio*; Matsuda, Tatsuma; Kogi, Masafumi*

Journal of the Physical Society of Japan, 77(Suppl.A), p.245 - 247, 2008/00

https://doi.org/10.1143/JPSJS.77SA.245
 Times Cited Count：3 Percentile：27.6(Physics, Multidisciplinary)

In filled skutterudite compounds, the importance of rattling is suggested in connection with the formation of heavy quasiparticles and superconductivity. A combination of the single crystal neutron diffraction and the maximum entropy method (MEM) offers an ability to unveil the thermal motion of Pr in PrOs$$_4$$Sb$$_{12}$$ without any specific model. The result reveals the widely spread Pr nuclear density distribution at room temperature, which has a trapezoidal shape in the real space with the width of roughly 0.6 ${AA}$ in the full width at half maximum. In contrast, the Pr distribution at 8 K has a sharp, isotropic gaussian shape, and the highest density locates at the center of the cage. These features indicate the strong anharmonicity of the Pr potential in the Sb cage.

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.

Journal Articles

Crystal structure and magnetic properties of new ternary uranium compounds U$$_{2/3}$$Pd$$_{2}$$Al$$_{5}$$

Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo; Yamamoto, Etsuji; Nguyen, D.; Onuki, Yoshichika

Journal of the Physical Society of Japan, 77(Suppl.A), p.365 - 367, 2008/00

https://doi.org/10.1143/JPSJS.77SA.365
 Times Cited Count：5 Percentile：38.74(Physics, Multidisciplinary)

Journal Articles

Multipole as $$f$$-electron spin-charge density in filled skutterudites

Hotta, Takashi

Journal of the Physical Society of Japan, 77(Suppl.A), p.96 - 101, 2008/00

https://doi.org/10.1143/JPSJS.77SA.96
 Times Cited Count：8 Percentile：49.99(Physics, Multidisciplinary)

In general, spin-orbit coupling is strong for $$f$$ electrons and then, spin-orbital complex degrees of freedom, i.e., ${it multipoles}$, become active in $$f$$-electron compounds. Due to recent advances in experimental techniques, multipole ordering phenomena have been actually observed in filled skutterudites with high symmetry. To understand multipole ordering, phenomenological theory has been developed and several experimental results could be explained, but it is necessary to make more effort to clarify microscopic aspects of multipole degrees of freedom in $$f$$-electron systems. Here I propose to define $$f$$-electron multipole as spin-charge density operator in one-body form from the viewpoint of multipole expansion of electron density in electromagnetism. Then, I analyze a seven-orbital Anderson model by using a numerical renormalization group method. I discuss possible multipole state of heavy lanthanide filled skutterudites.

Journal Articles

Super clean sample of URu$$_{2}$$Si$$_{2}$$

Matsuda, Tatsuma; Aoki, Dai*; Ikeda, Shugo; Yamamoto, Etsuji; Haga, Yoshinori; Okuni, Hitoshi*; Settai, Rikio*; Onuki, Yoshichika

Journal of the Physical Society of Japan, 77(Suppl.A), p.362 - 364, 2008/00

https://doi.org/10.1143/JPSJS.77SA.362
 Times Cited Count：22 Percentile：72.02(Physics, Multidisciplinary)

In the process of the single crystal growth of actinide compounds, the amount of raw actinide material should be reduced as much as possible. Considering this point, the flux method is one of the most effective methods. In order to develop the new actinide compounds include the filled skutterudite, we have been searching the suitable condition for growing the single crystal. In these trial processes, we have succeeded to grow some of the other single crystals of rare-earth and actinides compounds. For example, the single crystal of UCu$$_2$$Si$$_2$$, UCu$$_2$$Ge$$_2$$, ThCu$$_2$$Ge$$_2$$, CeCu$$_2$$Si$$_2$$, and YbCu$$_2$$Si$$_2$$ were grown by the Sn-flux method. In the case of UCu$$_2$$Si$$_2$$ and YbCu$$_2$$Si$$_2$$, the de Haas-van Alphen signals are detected by using these crystals. Recently, we also succeeded in growing the highest quality single crystal of URu$$_2$$Si$$_2$$ by the Czochralski-pulling method in a tetra-arc furnace and detecting the de Haas-van Alphen signal.

Journal Articles

Antiferro-quadrupole state of orbital-degenerate Kondo lattice model with $$f^{2}$$ configuration

Onishi, Hiroaki; Hotta, Takashi*

Journal of the Physical Society of Japan, 77(Suppl.A), p.199 - 201, 2008/00

https://doi.org/10.1143/JPSJS.77SA.199
 Times Cited Count：3 Percentile：27.6(Physics, Multidisciplinary)

Journal Articles

Pressure effect on ferromagnet UTeS

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

Journal of the Physical Society of Japan, 77(Suppl.A), p.359 - 361, 2008/00

https://doi.org/10.1143/JPSJS.77SA.359
 Times Cited Count：1 Percentile：11.66(Physics, Multidisciplinary)

The ferromagnet UTeS was studied by measurement the resistivity under high pressure. The Curie temperature $$T_{rm C}$$ rapidly increases from 87 K to 166 Kat 8 GPa. The result suggests that there is a correlation between the electrical conductivity and magnetic transition temperature, implying the strong hybridization.

Journal Articles

Heavy fermion superconductivity with the strong Pauli paramagnetic effect on NpPd$$_5$$Al$$_2$$

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

Journal of the Physical Society of Japan, 77(Suppl.A), p.159 - 164, 2008/00

https://doi.org/10.1143/JPSJS.77SA.159
 Times Cited Count：3 Percentile：27.6(Physics, Multidisciplinary)

Superconducting properties are investigated on the new neptunium-based superconductor NpPd$$_5$$Al$$_2$$. The large electronic specific heat, anisotropy of magnetic as well as superconducting properties and strong paramagnetic effect implies spin-singlet pairing with anisotropic superconducting gap.

Journal Articles

Superconducting properties of CePt$$_3$$Si and CeIrSi$$_3$$ without inversion symmetry in the crystal structure

Onuki, Yoshichika; Miyauchi, Yuichiro*; Tsujino, Masahiko*; Ida, Yuki*; Settai, Rikio*; Takeuchi, Tetsuya*; Tateiwa, Naoyuki; Matsuda, Tatsuma; Haga, Yoshinori; Harima, Hisatomo*

Journal of the Physical Society of Japan, 77(Suppl.A), p.37 - 42, 2008/00

https://doi.org/10.1143/JPSJS.77SA.37
 Times Cited Count：6 Percentile：43.17(Physics, Multidisciplinary)

Superconducting upper critical field of CePt$$_3$$Si and CeIrSi$$_3$$ without inversion symmetry was studied in detail. In CePt$$_3$$Si coexisting with antiferromagnetism, rather isotropic critical field was observed. On the other hand, huge anisotropy was detected in CeIrSi$$_3$$. These results are discussed in connection with the formation of the heavy fermion state.

9 (Records 1-9 displayed on this page)
  • 1