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Journal Articles

Photoemission study of (V$$_{1-x}$$$$M$$$$_{x}$$)$$_{2}$$O$$_{3}$$ ($$M$$=Cr,Ti)

Mo, S.-K.*; Kim, H.-D.*; Denlinger, J. D.*; Allen, J. W.*; Park, J.-H.*; Sekiyama, Akira*; Yamasaki, Atsushi*; Suga, Shigemasa*; Saito, Yuji; Muro, Takayuki*; et al.

Physical Review B, 74(16), p.165101_1 - 165101_12, 2006/10

 Times Cited Count:44 Percentile:84.54(Materials Science, Multidisciplinary)

We present high-resolution bulk-sensitive photoemission spectra of (V$$_{1-x}$$$$M$$$$_{x}$$)$$_{2}$$O$$_{3}$$ ($$M$$=Cr,Ti). The measurements were made for the paramagnetic metal (PM), paramagnetic insulator (PI), and antiferromagnetic insulator (AFI) phases of (V$$_{1-x}$$$$M$$$$_{x}$$)$$_{2}$$O$$_{3}$$. In the PM phase, we observe a prominent quasiparticle peak in general agreement with theory, which combines dynamical mean-field theory with the local density approximation. For both the PI and AFI phases, the vanadium 3$$d$$ parts of the valence spectra are not simple one peak structures. For the PI phase, there is not yet a good theoretical understanding of these structures. Spectra taken in the same phases with different compositions show interesting monotonic changes as the dopant concentration increases, regardless of the dopant species. With increased Cr-doping, the AFI phase gap decreases and the PI phase gap increases.

Journal Articles

Characterization of surface carbon films on weathered Japanese roof tiles by soft X-ray spectroscopy

Muramatsu, Yasuji; Yamashita, Michiru*; Motoyama, Muneyuki*; Hirose, Mika*; Denlinger, J. D.*; Gullikson, E. M.*; Perera, R. C. C.*

X-Ray Spectrometry, 34(6), p.509 - 513, 2005/11

 Times Cited Count:0 Percentile:0.02(Spectroscopy)

Surface carbon films on the weathered Japanese roof tiles were characterized by soft X-ray spectroscopy. From the X-ray absorption measurements, it was confirmed that the surface carbon films were oxidized by weathering. On the ohterhand, from the X-ray emission measurements, it can be confirmed that the degree of the orientation was kept in the inner carbon films.

Journal Articles

Element-selective observation of electronic structure transition between semiconducting and metallic states in boron-doped diamond using soft X-ray emission and absorption spectroscopy

Iihara, Junji*; Muramatsu, Yasuji; Takebe, Toshihiko*; Sawamura, Akitaka*; Namba, Akihiko*; Imai, Takahiro*; Denlinger, J. D.*; Perera, R. C. C.*

Japanese Journal of Applied Physics, Part 1, 44(9A), p.6612 - 6617, 2005/09

 Times Cited Count:12 Percentile:44.84(Physics, Applied)

Electronic structure transition between semiconducting and metallic states in boron (B) -doped diamonds was element-selectively observed by soft X-ray emission and absorption spectroscopy using synchrotron radiation. For the lightly B-doped diamonds, the B 2$$p$$-density of states (DOS) in the valence band were enhanced with a steep-edge-feature near the Fermi level, and localized acceptor levels, characteristic of semiconductors, were clearly observed both in B 2$$p$$- and C 2$$p$$-DOS in the conduction bands. For the heavily B-doped diamonds, the localized acceptor levels developed into extended energy levels and new energy levels were generated to form an extended conduction band structure which overlapped with the valence band. Thus, this clarified that the metallic energy band structure is actually formed by heavy boron doping. Such valence and conduction band structures observed by soft X-ray emission and absorption spectroscopy well accounted for the electrical properties of the B-doped diamonds.

Journal Articles

Evaluation of carbon films on the Japanese smoked roof tile "Ibushi-Kawara" by angle-dependent soft X-ray emission spectroscopy using synchrotron radiation

Muramatsu, Yasuji; Yamashita, Michiru*; Motoyama, Muneyuki*; Denlinger, J. D.*; Gullikson, E. M.*; Perera, R. C. C.*

Spectrochimica Acta, Part B, 59(8), p.1317 - 1322, 2004/08

 Times Cited Count:2 Percentile:10.72(Spectroscopy)

Polarized emission spectra from graphite have been measured by an EPMA and discussed by means of molecular orbital calculation of 2p electrons densities of state of graphite by some of the present authors. The present study treats the refined measurements of the polarized C K-emission band spectra from the highly oriented pyrolytic graphite (HOPG) and discusses the structure of the surface carbons of Japanese traditional smoked roof tiles, Ibushi Kawara.

Journal Articles

Soft X-ray emission spectroscopy of polycyclic aromatic hydrocarbons

Muramatsu, Yasuji; Tomizawa, Kana; Denlinger, J. D.*; Perera, R. C. C.*

Journal of Electron Spectroscopy and Related Phenomena, 137-140(1-3), p.823 - 826, 2004/07

High-resolution CK X-ray emission spectra of polycyclic aromatic hydrocarbons (PAH) were measured using synchrotron radiation. The main peak energies in the PAH X-ray spectra shifted to a higher energy region as the ratio of hydrogenated outer carbon atoms to the non-hydrogenated inner carbon atoms increased. Discrete variational (DV)-X$$alpha$$ molecular orbital calculations provided theoretical confirmation that the spectral features depend on the ratio of hydrogenated/non-hydrogenated carbon atoms, which suggests that the features around the main peaks provide the information of the degree of hydrogenation in PAH compounds.

Journal Articles

Characterization of carbon films on the Japanese smoked roof tile "Ibushi-Kawara" by high-resolution soft X-ray spectroscopy

Muramatsu, Yasuji; Motoyama, Muneyuki*; Denlinger, J. D.*; Gullikson, E. M.*; Perera, R. C. C.*

Japanese Journal of Applied Physics, Part 1, 42(10), p.6551 - 6555, 2003/10

 Times Cited Count:5 Percentile:25.22(Physics, Applied)

Carbon films on Japanese smoked roof tile "Ibushi-Kawara" were characterized by high-resolution soft X-ray spectroscopy using synchrotron radiation. By comparing the soft X-ray emission and absorption spectra of Kawara with the reference carbon compounds, it was determined that the carbon films on Kawara consist of mostly carbon-black-like sp2 carbon atoms and that the surface also contains polyethylene-like sp3 carbon atoms. The take-off/incident-angle dependence on the X-ray emission/absorption spectra of Kawara implies that the carbon-black-like sp2 carbon atoms partially form a layer structure parallel to the basal clay plane. From the take-off-angle dependence of the p/s-peak intensity ratio in the X-ray emission spectra, the layer ordering of the carbon films is estimated to be 50% of highly oriented pyrolytic graphite (HOPG). Therefore, the metallic oxidized color and durability are due to the layer structure and the random structure that connects the layer-structured clusters, respectively.

Journal Articles

Prominent quasiparticle peak in the photoemission spectrum of the metallic phase of V$$_{2}$$O$$_{3}$$

Mo, S.-K.*; Denlinger, J. D.*; Kim, H.-D.*; Park, J.-H.*; Allen, J. W.*; Sekiyama, Akira*; Yamasaki, Atsushi*; Kadono, Koji*; Suga, Shigemasa*; Saito, Yuji; et al.

Physical Review Letters, 90(18), p.186403_1 - 186403_4, 2003/05


 Times Cited Count:134 Percentile:95.62(Physics, Multidisciplinary)

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