Remote hole-doping of Mott insulators on the nanometer scale (2008)
Takizawa, M., Hotta, Y., Susaki, T., Ishida, Y., Wadati, H., Takata, Y., ...
At interfaces between polar and nonpolar perovskite oxides, an unusual electron-doping has been previously observed, due to electronic reconstructions. We report on remote hole-doping at an interface...
Bulk-like d band of SrVO3 under a self-protective cap layer (2008)
Takizawa, M., Minohara, M., Kumigashira, H., Toyota, D., Oshima, M., Wadati, H., ...
We have performed a detailed angel-resolved photoemission spectroscopy study of in-situ prepared SrVO3 thin films. Naturally capped by a ``transparent'' protective layer, contributions from surface...
Charge order in La_{1.8-x}Eu_{0.2}Sr_xCuO_4 studied by resonant soft X-ray diffraction (2008)
Fink, J., Schierle, E., Weschke, E., Geck, J., Hawthorn, D., Wadati, H., ...
Resonant soft X-ray scattering with photon energies near the O K and the Cu L3 edges was used to study charge ordering in the system La_{1.8-x}Eu_{0.2}Sr_xCuO_4 as a function of temperature for x =...
Effects of electron-phonon coupling in angle-resolved photoemission spectra of SrTiO3 (2007)
Maekawa, K., Takizawa, M., Wadati, H., Yoshida, T., Fujimori, A., Kumigashira, H., ...
We have studied the O 2p valence-band structure of Nb-doped SrTiO3, in which a dilute concentration of electrons are doped into the d0 band insulator, by angle-resolved photoemission spectroscopy...
Wadati, H., Maniwa, A., Chikamatsu, A., Ohkubo, I., Kumigashira, H., Oshima, M., ...
We have performed an {\it in-situ} photoemission study of Pr_{1-x}Ca_xMnO_3 (PCMO) thin films grown on LaAlO_3 (001) substrates and observed the effect of epitaxial strain on the electronic...
Terai, K., Wadati, H., Kobayashi, M., Takizawa, M., Hwang, J. I., ...
Epitaxial Ba0.5Sr0.5TiO3 thin films were prepared on Nb-doped SrTiO3 (100)substrates by the pulsed laser deposition technique, and were studied by measuring the Ti 2p - 3d resonant photoemission...
Chikamatsu, A., Wadati, H., Kumigashira, H., Oshima, M., Fujimori, A., Lippmaa, M., ...
We report the first observation of changes in the electronic structure of La$_{1-x}$Sr$_{x}$MnO$_{3}$ (LSMO) across the filling-control metal-insulator (MI) transition by means of in situ...
Hard x-ray photoemission study of LaAlO3/LaVO3 multilayers (2007)
Wadati, H., Hotta, Y., Fujimori, A., Susaki, T., Hwang, H. Y., Takata, Y., ...
We have studied the electronic structure of multilayers composed of a band insulator LaAlO$_3$ (LAO) and a Mott insulator LaVO$_3$ (LVO) by means of hard x-ray photoemission spectroscopy, which has a...
Photoemission study of TiO2/VO2 interfaces (2006)
Maekawa, K., Takizawa, M., Wadati, H., Yoshida, T., Fujimori, A., Kumigashira, H., ...
We have measured photoemission spectra of two kinds of TiO$_2$-capped VO$_2$ thin films, namely, that with rutile-type TiO$_2$ (r-TiO$_2$/VO$_2$) and that with amorphous TiO$_2$ (a-TiO$_2$/VO$_2$)...
Electronic structure of the Mott insulator LaVO3 in a quantum well geometry (2006)
Hotta, Y., Wadati, H., Fujimori, A., Susaki, T., Hwang, H. Y.
We used x-ray photoemission spectroscopy to investigate the electronic structure of the Mott insulator LaVO3 embedded in LaAlO3. By limiting the upper layer of LaAlO3 to 3 unit cells, the underlying...
Ebata, K., Wadati, H., Takizawa, M., Fujimori, A., Chikamatsu, A., Kumigashira, H., ...
We have studied the chemical potential shift and changes in the electronic density of states near the Fermi level ($E_F$) as a function of carrier concentration in Pr$_{1-x}$Ca$_x$MnO$_3$ (PCMO, $0.2...
Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices (2006)
Takizawa, M., Wadati, H., Tanaka, K., Hashimoto, M., Yoshida, T., Fujimori, A., ...
We have measured photoemission spectra of SrTiO3/LaTiO3 superlattices with a topmost SrTiO3 layer of variable thickness. Finite coherent spectral weight with a clear Fermi cut-off was observed at...
Wadati, H., Yoshida, T., Chikamatsu, A., Kumigashira, H., Oshima, M., Eisaki, H., ...
Nowadays it has become feasible to perform angle-resolved photoemission spectroscopy (ARPES) measurements of transition-metal oxides with three-dimensional perovskite structures owing to the...
Wadati, H., Chikamatsu, A., Takizawa, M., Hashimoto, R., Kumigashira, H., Yoshida, T., ...
We have performed an angle-resolved photoemission spectroscopy study of La$_{0.6}$Sr$_{0.4}$FeO$_3$ using {\it in situ} prepared thin films and determined its band structure. The experimental band...
Robust Ti4+ states in SrTiO3 layers of La0.6Sr0.4MnO3/SrTiO3/ La0.6Sr0.4MnO3 junctions (2005)
Kumigashira, H., Chikamatsu, A., Hashimoto, R., Oshima, M., Ohnishi, T., Lippmaa, M., ...
We have investigated the interfacial electronic structure of La0.6Sr0.4MnO3 (LSMO)/ SrTiO3 (STO)/ LSMO heterojunctions utilizing the elemental selectivity of photoemission spectroscopy. The Ti 2p...
Valence changes associated with the metal-insulator transition in Bi$_{1-x}$La$_x$NiO$_3$ (2005)
Wadati, H., Takizawa, M., Tran, T. T., Tanaka, K., Mizokawa, T., Fujimori, A., ...
Perovskite-type BiNiO$_3$ is an insulating antiferromagnet in which a charge disproportionation occurs at the Bi site. La substitution for Bi suppresses the charge disproportionation and makes the...
Chikamatsu, A., Wadati, H., Kumigashira, H., Oshima, M., Fujimori, A., Hamada, N., ...
We have performed an in situ angle-resolved photoemission spectroscopy (ARPES) on single-crystal surfaces of La$_{0.6}$Sr$_{0.4}$MnO$_{3}$ (LSMO) thin films grown on SrTiO$_{3}$ (001) substrates by...
Manifestation of Correlation Effects in the photoemission spectra of Ca$_{1-x}$Sr$_x$RuO$_3$ (2004)
Takizawa, M., Toyota, D., Wadati, H., Chikamatsu, A., Kumigashira, H., Fujimori, A., ...
We have measured soft x-ray photoemission and O 1{\it s} x-ray absorption spectra of Ca$_{1-x}$Sr$_x$RuO$_3$ thin films prepared {\it in situ}. The coherent and incoherent parts have been identified...
Wadati, H., Chikamatsu, A., Hashimoto, R., Takizawa, M., Kumigashira, H., Fujimori, A., ...
We have measured the temperature dependence of the photoemission and x-ray absorption spectra of La$_{1-x}$Sr$_x$FeO$_3$ (LSFO) epitaxial thin films with $x=0.67$, where charge disproportionation...
Wadati, H., Kobayashi, D., Kumigashira, H., Okazaki, K., Mizokawa, T., Fujimori, A., ...
We have studied the electronic structure of epitaxially grown thin films of La$_{1-x}$Sr$_x$FeO$_3$ by {\it in-situ} photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS)...
Okazaki, K., Wadati, H., Fujimori, A., Onoda, M., Muraoka, Y., Hiroi, Z.
We have made a detailed temperature-dependent photoemission study of VO_2/TiO_2(001) thin films, which show a metal-insulator transition at \sim 300 K. Clean surfaces were obtained by annealing the...