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Journal Articles

Electronic structure of heavy fermion uranium compounds studied by core-level photoelectron spectroscopy

Fujimori, Shinichi; Okochi, Takuo*; Kawasaki, Ikuto; Yasui, Akira; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi; Yamagami, Hiroshi; Haga, Yoshinori; et al.

Journal of the Physical Society of Japan, 81(1), p.014703_1 - 014703_9, 2012/01

 Times Cited Count:35 Percentile:83.28(Physics, Multidisciplinary)

High-energy-resolution core-level and valence-band photoelectron spectroscopic studies were performed for the heavy Fermion uranium compounds UGe$$_2$$, UCoGe, URhGe, URu$$_2$$Si$$_2$$, UNi$$_2$$Al$$_3$$, UPd$$_2$$Al$$_3$$, and UPt$$_3$$ as well as typical localized and itinerant uranium compounds to understand the relationship between the uranium valence state and their core-level spectral line shapes. The core-level spectra of UGe$$_2$$, UCoGe, URhGe, URu$$_2$$Si$$_2$$, and UNi$$_2$$Al$$_3$$ are rather similar to those of itinerant compounds, suggesting that U 5$$f$$ electrons in these compounds are well hybridized with ligand states. On the other hand, the core-level spectra of UPd$$_2$$Al$$_3$$ and UPt$$_3$$ show considerably different spectral line shapes from those of the itinerant compounds, suggesting that U 5$$f$$ electrons in UPd$$_2$$Al$$_3$$ and UPt$$_3$$ are less hybridized with ligand states, leading to the correlated nature of U 5$$f$$ electrons in these compounds.

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

 Times Cited Count:22 Percentile:73.7(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

$$^{238}$$U M$"o$ssbauer study on the magnetic properties of uranium-based heavy fermion superconductors

Tsutsui, Satoshi; Nakada, Masami; Nasu, Saburo*; Haga, Yoshinori; Homma, Tetsuo; Yamamoto, Etsuji; Okuni, Hitoshi*; Onuki, Yoshichika

Hyperfine Interactions, 126(1-4), p.335 - 340, 2000/07

 Times Cited Count:6 Percentile:38.76(Physics, Atomic, Molecular & Chemical)

no abstracts in English

Journal Articles

$$^{238}$$U M$"o$ssbauer spectrosopic study of UPd$$_{2}$$Al$$_{3}$$ and URu$$_{2}$$Si$$_{2}$$

Tsutsui, Satoshi; Nakada, Masami; Nasu, Saburo*; Haga, Yoshinori; Homma, Tetsuo; Yamamoto, Etsuji; Okuni, Hitoshi*; Onuki, Yoshichika

Physica B; Condensed Matter, 281-282, p.242 - 243, 2000/06

 Times Cited Count:3 Percentile:22.75(Physics, Condensed Matter)

no abstracts in English

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