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Fe
O with hole dopingKobayashi, Masaki*; Hwang, J. I.*; Song, G.*; Oki, Yasuhiro*; Takizawa, Masaru*; Fujimori, Atsushi; Takeda, Yukiharu; Fujimori, Shinichi; Terai, Kota*; Okane, Tetsuo; et al.
Physical Review B, 78(15), p.155322_1 - 155322_4, 2008/10
Times Cited Count：5 Percentile：25.34(Materials Science, Multidisciplinary)CrTeKobayashi, Masaki*; Ishida, Yukiaki*; Hwang, J. I.*; Song, G. S.*; Fujimori, Atsushi; Yang, C. S.*; Lee, L.*; Lin, H.-J.*; Huang, D.-J.*; Chen, C. T.*; et al.
New Journal of Physics (Internet), 10, p.055011_1 - 055011_15, 2008/05
Times Cited Count：16 Percentile：65.35(Physics, Multidisciplinary)Ru
O
thin filmsTerai, Kota*; Yoshii, Kenji; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Owada, Kenji; Inami, Toshiya; Okane, Tetsuo; Arita, Masashi*; Shimada, Kenya*; et al.
Physical Review B, 77(11), p.115128_1 - 115128_6, 2008/03
Times Cited Count：19 Percentile：57.47(Materials Science, Multidisciplinary)
O
thin films exhibiting photoinduced magnetizationKobayashi, Masaki*; Oki, Yasuhiro*; Takizawa, Masaru*; Song, G. S.*; Fujimori, Atsushi; Takeda, Yukiharu; Terai, Kota*; Okane, Tetsuo; Fujimori, Shinichi; Saito, Yuji; et al.
Applied Physics Letters, 92(8), p.082502_1 - 082502_3, 2008/02
Times Cited Count：13 Percentile：46.42(Physics, Applied)SrRuO across the ferromagnetic quantum phase transitionOkamoto, Jun*; Okane, Tetsuo; Saito, Yuji; Terai, Kota*; Fujimori, Shinichi; Muramatsu, Yasuji*; Yoshii, Kenji; Mamiya, Kazutoshi*; Koide, Tsuneharu*; Fujimori, Atsushi; et al.
Physical Review B, 76(18), p.184441_1 - 184441_5, 2007/11
Times Cited Count：38 Percentile：78.81(Materials Science, Multidisciplinary)CaSrRuO, which is ferromagnetic for Sr concentration x 
0.3, has been studied by X-ray magnetic circular dichroism (XMCD) in Ru 3
and O 1
core-level X-ray absorption. XMCD signals appear at x 
0.3 and monotonically increases with x in the ferromagnetic phase. While the monotonic increase of the XMCD signals with x is of a typical Stoner-type, the absence of appreciable change in the spectral line shapes of both the Ru 3 and O 1 XMCD spectra indicate that the itinerant-electron ferromagnetism in CaSrRuO is influenced by strong electron correlation.
SrTiO films by in situ resonant photoemission spectroscopyLin, Y.-H.*; Terai, Kota*; Wadachi, Hiroki*; Kobayashi, Masaki*; Takizawa, Masaru*; Hwang, J. I.*; Fujimori, Atsushi; Nan, C.-W.*; Li, J.-F.*; Fujimori, Shinichi; et al.
Applied Physics Letters, 90(22), p.222909_1 - 222909_3, 2007/05
Times Cited Count：8 Percentile：32.92(Physics, Applied)Epitaxial BaSrTiO thin films were prepared on Nb-doped SrTiO (100) substrates by the pulsed laser deposition technique and were studied by measuring the Ti 2p 
3d resonant photoemission spectra in the valence-band region, both at room temperature and low temperature. The results demonstrated an abrupt variation in the spectral structures between 2.8 nm (7 ML) and 2.0 nm (5 ML) BaSrTiO films, suggesting that there exists a critical thickness for phase change in the range of 2.0-2.8 nm.
RuO thin filmsTerai, Kota; Yoshii, Kenji; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Owada, Kenji; Inami, Toshiya; Okane, Tetsuo; Arita, Masashi*; Shimada, Kenya*; et al.
Journal of Magnetism and Magnetic Materials, 310(2, Part2), p.1070 - 1072, 2007/03
We have studied the electronic and magnetic properties of epitaxially grown CaMnRuO (x = 1.0, 0.5) thin films by X-ray magnetic circular dichroism (XMCD) and hard X-ray photoemission spectroscopy (HXPES). The XMCD studies indicated that the spin moments of Mn and Ru are aligned in the opposite directions. The HXPES spectra indicated the Ru 4d states at around the Fermi edge (E
) and the Mn 3d states below E. From these results, we propose that the localized Mn 3d t
states and the itinerant Ru 4d t band are antiferromagnetically coupled and give rise to ferromagnetism, in analogy with the mechanism proposed for the double perovskite oxides such as Sr
FeMoO
.
VO thin filmIshida, Yukiaki*; Hwang, J. I.*; Kobayashi, Masaki*; Takeda, Yukiharu; Mamiya, Kazutoshi*; Okamoto, Jun*; Fujimori, Shinichi; Okane, Tetsuo; Terai, Kota*; Saito, Yuji; et al.
Applied Physics Letters, 90(2), p.022510_1 - 022510_3, 2007/01
Times Cited Count：24 Percentile：65.02(Physics, Applied)no abstracts in English
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：0.00(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：22.09(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：12.01(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.
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：66.39(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.
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
RuO thin filmsTerai, Kota; Okane, Tetsuo; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Inami, Toshiya; Yamagami, Hiroshi; Kobayashi, Keisuke*; Shimada, Kenya*; Arita, Masashi*; et al.
no journal, ,
no abstracts in English
RuOTerai, Kota; Okane, Tetsuo; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Yoshii, Kenji; Owada, Kenji; Inami, Toshiya; Arita, Masashi*; Shimada, Kenya*; et al.
no journal, ,
no abstracts in English
RuO thin filmsTerai, Kota; Okane, Tetsuo; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Yoshii, Kenji; Kobayashi, Keisuke*; Fujimori, Atsushi
no journal, ,
A pseudobinary alloy of CaMnRuO (CMRO) is interesting because the solid solution CMRO shows a metallic ferromagnetism although both of the end compositions does not show ferromagnetism. We have fabricated the epitaxial CMRO thin films using the pulsed laser deposition (PLD) method, and studied the ferromagnetic moments by soft X-ray absorption magnetic circular dichroism (XMCD) measurements. The XMCD studies indicated that the spin moments of Mn and Ru are aligned in antiparallel directions. We consider that the small total magnetic moment of CMRO results from the cancellation of the Ru spin moment from Mn spin moment.
