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Journal Articles

Photoemission spectroscopy and X-ray absorption spectroscopy studies of the superconducting pyrochlore oxide Cd$$_{2}$$Re$$_{2}$$O$$_{7}$$

Irizawa, Akinori*; Higashiya, Atsushi*; Kasai, Shuichi*; Sasabayashi, Takehisa*; Shigemoto, Akihiko*; Sekiyama, Akira*; Imada, Shin*; Suga, Shigemasa*; Sakai, Hironori; Ono, Hiroyuki*; et al.

Journal of the Physical Society of Japan, 75(9), p.094701_1 - 094701_5, 2006/09

https://doi.org/10.1143/JPSJ.75.094701
 Times Cited Count：6 Percentile：41.77(Physics, Multidisciplinary)

Photoemission spectroscopy (PES) and O $$1s$$ X-ray absorption spectroscopy (XAS) measurements have been performed for Cd$$_2$$ Re$$_2$$ O$$_7$$ single crystals. Temperature variations of their spectra reveal that the phase transition at 120 K directly changes the band structure near the Fermi level compared with another transition near 200 K. The roles of the transitions are discussed in terms of the changes in the Re-O orbital hybridization.

Journal Articles

Surface chemical reaction dynamics illuminated by high brilliance and high energy-resolution synchrotron radiation; In-situ photoemission spectroscopy for surface oxidation induced by supersonic O$$_{2}$$ molecular beams

Teraoka, Yuden; Yoshigoe, Akitaka; Moritani, Kosuke; Takakuwa, Yuji*; Ogawa, Shuichi*; Ishizuka, Shinji*; Okada, Michio*; Fukuyama, Tetsuya*; Kasai, Toshio*

Hoshako, 18(5), p.298 - 309, 2005/09

http://ci.nii.ac.jp/naid/10016126004

Representative research results in surface reaction dynamics, performed at a surface chemistry experimental station installed in the JAEA soft X-ray beamline in the SPring-8, were reviewed. As a research result in JAEA, SiO desorption mechanisms in the Si(001) oxidation at high temperature were introduced. As a collaboration with Osaka University on oxidation reaction dynamics of Cu, collision-induced atom absorption process was introduced. As a collaboration with Tohoku University on Ti(0001) oxidation reaction dynamics, it was introduced that two peaks, found in an incident energy dependence of initial sticking probability, were corresponding to potential energy barriers of dissociative adsorption of O$$_{2}$$ molecules.

Journal Articles

Resonant photoemission spectroscopy study of impurity-induced melting in Cr- and Ru-doped Nd$$_{1/2}$$A$$_{1/2}$$MnO$$_{3}$$ (A=Ca,Sr)

Kang, J.-S.*; Kim, J. H.*; Sekiyama, Akira*; Kasai, Shuichi*; Suga, Shigemasa*; Han, S. W.*; Kim, K. H.*; Choi, E. J.*; Kimura, Tsuyoshi*; Muro, Takayuki*; et al.

Physical Review B, 68(1), p.012410_1 - 012410_4, 2003/07

A2003-0329.pdf:0.49MB

https://doi.org/10.1103/PhysRevB.68.012410
 Times Cited Count：21 Percentile：68.18(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Bulk-sensitive photoemission spectroscopy of $$A_{2}$$FeMoO$$_{6}$$ double perovskites ($$A$$=Sr, Ba)

Kang, J.-S.*; Kim, J. H.*; Sekiyama, Akira*; Kasai, Shuichi*; Suga, Shigemasa*; Han, S. W.*; Kim, K. H.*; Muro, Takayuki*; Saito, Yuji; Hwang, C.*; et al.

Physical Review B, 66(11), p.113105_1 - 113105_4, 2002/09

https://doi.org/10.1103/PhysRevB.66.113105
 Times Cited Count：65 Percentile：90.15(Materials Science, Multidisciplinary)

The electronic structures of Sr$$_{2}$$FeMoO$$_{6}$$ (SFMO) and Ba$$_{2}$$FeMoO$$_{6}$$ (BFMO) double perovskites have been investigated using Fe 2p-3d resonant photoemission spectroscopy (PES) and the Cooper minimum in the Mo 4d photoionization cross section. The states close to the Fermi level are found to have a strongly mixed Mo–Fe t$$_{2g}$$ character, indicating that the Fe valence is far from pure 3+. The Fe 2p$$_{3/2}$$ x-ray absorption spectroscopy spectra reveal the mixed-valent Fe $$^{3+}$$–Fe$$^{2+}$$ configurations, and a larger Fe$$^{2+}$$ component for BFMO than for SFMO, suggesting an operative double exchange interaction. The valence-band PES spectra reveal good agreement with the local-spin-density-approximation (LSDA+U) calculation.

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