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Takahiro, Katsumi*; Oizumi, Shinnosuke*; Terai, Atsushi*; Kawatsura, Kiyoshi*; Tsuchiya, Bun*; Nagata, Shinji*; Yamamoto, Shunya; Naramoto, Hiroshi; Narumi, Kazumasa; Sasase, Masato*
Journal of Applied Physics, 100(8), p.084325_1 - 084325_6, 2006/10
Times Cited Count：28 Percentile：68.27(Physics, Applied)X-ray photoelectron spectroscopy (XPS) has been applied for size estimation of Au clusters formed by ion implantation into glassy carbon. The 4f and 5d XPS spectra reveal the presence of the cluster 0.7-2.5nm in diameter, depending on the Au concentration. The elationship between XPS 4f-binding energy shift and 5d splitting is determined for the Au clusters embedded in the carbon and found to be significantly different from the previous data for the ones supported on a carbon substrate. We suppose that this difference results from the effect of the environment around a cluster on Coulomb charging during photoemission at the final state.
Fujimori, Shinichi; Terai, Kota; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Kobayashi, Keisuke; Fujimori, Atsushi; Yamagami, Hiroshi*; Ikeda, Shugo; Matsuda, Tatsuma; et al.
Journal of the Physical Society of Japan, 75(Suppl.), p.99 - 101, 2006/08
Times Cited Count：0 Percentile：0(Physics, Multidisciplinary)In the present study, we have performed SX-ARPES experiments on some heavy Fermion (HF) uranium compounds such as UPd
Al
using soft X-ray synchrotron radiation from BL23SU of SPring-8. UPdAl is an HF uranium compound which has transitions into an antiferromagnetic phase at 
K and into a superconducting phase at 
=2 K. To describe the various properties of this compound, the dual model for U 5
states is proposed. In this model, two of the three U 5f states are in a localized state while the third electron has delocalized character. We have obtained U 5f sensitive band structure of UPdAl by SX-ARPES, and the results are compared with this scenario. Temperature dependence of the U 5 electronic structure in this compound is also discussed.
Okane, Tetsuo; Takeda, Yukiharu; Fujimori, Shinichi; Terai, Kota; Saito, Yuji; Muramatsu, Yasuji; Fujimori, Atsushi; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika
Physica B; Condensed Matter, 378-380, p.959 - 960, 2006/05
Times Cited Count：4 Percentile：22.72(Physics, Condensed Matter)no abstracts in English
Fujimori, Shinichi; Terai, Kota; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Muramatsu, Yasuji; Fujimori, Atsushi; Yamagami, Hiroshi*; Ikeda, Shugo; Matsuda, Tatsuma; et al.
Physica B; Condensed Matter, 378-380, p.995 - 996, 2006/05
Times Cited Count：2 Percentile：12.56(Physics, Condensed Matter)Recently, photoemission experiments in soft X-ray region have attracted much attention due to their high sensitivities for bulk electronic structures of strongly correlated electron system. We have carried out the high-resolution photoemission experiments on some uranium compounds using soft X-ray synchrotron radiation from SPring-8 to understand their electronic structures. Bulk- and U 5-sensitive band structure and Fermi surface were obtained for itinerant U 5 compounds UFeGa
and USb, and they are compared with the results of the band structure calculations treating U 5 states as being itinerant. In addition, we show the results of photoemission study on some heavy fermion compounds such as UPdAl and UNiAl. The temperature dependences of the U 5 electronic structure of UPdAl will be also reported.
Takahiro, Katsumi*; Terai, Atsushi*; Kawatsura, Kiyoshi*; Naramoto, Hiroshi; Yamamoto, Shunya; Tsuchiya, Bun*; Nagata, Shinji*; Nishiyama, Fumitaka*
Japanese Journal of Applied Physics, Part 1, 45(3A), p.1823 - 1825, 2006/03
Times Cited Count：2 Percentile：8.69(Physics, Applied)It is found that the surface charging during Rutherford backscattering spectrometry (RBS) of insulating sapphire samples enables us to measure the charge-state distribution of probing ions backscattered at the sapphire surface. For Cu/Au-deposited Al
O
samples, two components, higher and lower-energy ones, were resolved on both Cu and Au peaks in the RBS random spectrum. For single-crystalline AlO samples, a double-peak structure was clearly observed on both Al and O surface peaks in the RBS aligned spectrum. The charge-state distribution can be obtained from the intensity of each component. The results obtained here are compared with previous data for the equilibrium charge-state distribution.
band states in the layered compound UFeGa observed by soft X-ray angle-resolved photoemission spectroscopyFujimori, Shinichi; Terai, Kota; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Muramatsu, Yasuji; Fujimori, Atsushi; Yamagami, Hiroshi*; Tokiwa, Yoshifumi*; Ikeda, Shugo; et al.
Physical Review B, 73(12), p.125109_1 - 125109_6, 2006/03
Times Cited Count：22 Percentile：66.99(Materials Science, Multidisciplinary)We have performed angle-resolved photoemission spectroscopy (ARPES) experiments on paramagnetic UFeGa using soft X-ray synchrotron radiation (
=500 eV) and derived the bulk- and U 5-sensitive electronic structure of UFeGa. Although the agreement between the experimental band strucure and the LDA calculation treating U 5 electrons as beeing itinerant is qualitative, the morphology of the Fermi surface is well explained by the calculation. This result claims that the importance of the electron correlation effect even for the itinerant U 5 compound.
Takahiro, Katsumi*; Terai, Atsushi*; Oizumi, Shinnosuke*; Kawatsura, Kiyoshi*; Yamamoto, Shunya; Naramoto, Hiroshi
Nuclear Instruments and Methods in Physics Research B, 242(1-2), p.445 - 447, 2006/01
Times Cited Count：9 Percentile：53.55(Instruments & Instrumentation)X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy have been applied to investigate amorphization processes by ion irradiation for various carbon materials, including highly oriented pyrolytic graphite (HOPG), isotropic graphite, glassy carbon (GC) and C
crystalline film. It is found that the asymmetry of the XPS C 1s line increases as the irradiation dose increases. The origin of the asymmetry appeared on the C 1s line is discussed. It is concluded that the asymmetry of the C 1s line is not correlated with the increase in the size of a graphitic layer, but is related with the structural disorders, such as a bond angle disorder.
Okane, Tetsuo; Takeda, Yukiharu; Fujimori, Shinichi; Terai, Kota; Saito, Yuji; Kobayashi, Keisuke*; Fujimori, Atsushi*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika*
no journal, ,
no abstracts in English
