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Izumi, Yudai*; Kamohara, Masumi*; Nakagawa, Kazumichi*; Tanaka, Masahito*; Agui, Akane; Muro, Takayuki*; Matsushita, Tomohiro*
no journal, ,
no abstracts in English
Fujimori, Shinichi; Okochi, Takuo; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi; Yamagami, Hiroshi; Ikeda, Shugo; Matsuda, Tatsuma; Haga, Yoshinori; Yamamoto, Etsuji; et al.
no journal, ,
Angle resolved photoemission spectroscopy in soft X-ray (SX-ARPES) has been recognized as a powerful experimental tool to reveal electronic structures of strongly correlated materials. Meanwhile, although actinide compounds attract much attention in recent years due to their exotic superconducting and magnetic properties, their electronic structures are not well understood. Since SX-ARPES can probe bulk U 5f electronic structures, it is possible to explore the mechanism of superconductivity or magnetism in actinide compounds. In the present study, we show recent results of SX-ARPES studies on superconducting and magnetic uranium compounds. Experiments were performed at the soft X-ray beamline SPring-8 BL23SU. We have clearly observed energy band dispersion and Fermi surface of U 5f origin in these compounds. The obtained data are compared with theoretical models, and the mechanisms of superconductivity and magnetism in uranium compounds are discussed.
Agui, Akane; Mizumaki, Masaichiro*; K
mbre, T.*
no journal, ,
no abstracts in English
Ukai, Masatoshi*; Fujii, Kentaro; Saito, Yuji; Yokoya, Akinari
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Yokoya, Akinari; Fujii, Kentaro; Ukai, Masatoshi*
no journal, ,
We have developed an EPR apparatus installed in a soft X-ray beamline, BL23SU in SPring-8, to study DNA radical processes induced by K-shell photoionization/excitation at specific elements constituting DNA. "
" EPR measurement for thin layers of DNA related molecule reveals that (1) short-lived radicals are observed in evaporated thin film of guanine and adenine bases only when irradiated with soft X-rays, (2) the EPR spectra are different between oxygen and nitrogen K-edge region, (3) the photon energy dependence of the radical yields are similar to those of XANES. Interestingly, (4) physically adsorbed water on sample surface of the evaporated base film seem to quench the base radical generation, and (5) photon energy dependence of total radical yield of a calf thymus DNA film shows a large peak at oxygen K-edge region. These results indicate that hydrated waters to DNA might strongly modify the short-lived radical process.
Jarrige, I.; Rueff, J.-P.*; Shieh, S.*; Wang, J.*; Matsumura, Takashi*; Ishii, Hirofumi*; Hiraoka, Nozomu*; Cai, Y.*
no journal, ,