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Journal Articles

Electronic structures of ferromagnetic superconductors UGe$$_{2}$$ and UCoGe studied by angle-resolved photoelectron spectroscopy

Fujimori, Shinichi; Okochi, Takuo*; Kawasaki, Ikuto*; Yasui, Akira*; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi; Yamagami, Hiroshi; Haga, Yoshinori; et al.

Physical Review B, 91(17), p.174503_1 - 174503_9, 2015/05

 Times Cited Count:23 Percentile:70.81(Materials Science, Multidisciplinary)

The electronic structures of the ferromagnetic superconductors UGe$$_2$$ and UCoGe in the paramagnetic phase were studied by angle-resolved photoelectron spectroscopy using soft X-rays ($$h nu$$ = 400-500 eV). The quasi-particle bands with large contributions from U 5$$f$$ states were observed in the vicinity of EF, suggesting that the U 5$$f$$ electrons of these compounds have an itinerant character. Their overall band structures were explained by the band-structure calculations treating all the U 5$$f$$ electrons as being itinerant. Meanwhile, the states in the vicinity of EF show considerable deviations from the results of band-structure calculations, suggesting that the shapes of Fermi surface of these compounds are qualitatively different from the calculations, possibly caused by electron correlation effect in the complicated band structures of the low-symmetry crystals. Strong hybridization between U 5$$f$$ and $$mathrm{Co} 3d$$ states in UCoGe were found by the $$mathrm{Co}$$ 2p-3d resonant photoemission experiment, suggesting that $$mathrm{Co} 3d$$ states have finite contributions to the magnetic, transport, and superconducting properties.

Journal Articles

Itinerant nature of U 5$$f$$ states in uranium mononitride revealed by angle-resolved photoelectron spectroscopy

Fujimori, Shinichi; Okochi, Takuo*; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi; Yamagami, Hiroshi; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika

Physical Review B, 86(23), p.235108_1 - 235108_8, 2012/12

 Times Cited Count:35 Percentile:78.81(Materials Science, Multidisciplinary)

The electronic structure of the antiferromagnet uranium nitride (UN) has been studied by angle resolved photoelectron spectroscopy using soft X-rays. The band structure as well as the Fermi surfaces in the paramagnetic phase are well explained by the band-structure calculation treating all the U 5$$f$$ electrons as being itinerant, suggesting that itinerant description of the U 5$$f$$ states is appropriate for this compound. On the other hand, changes in the spectral function due to the antiferromagnetic transition were very small. The shapes of the Fermi surfaces in a paramagnetic phase are highly three-dimensional, and the nesting of Fermi surfaces is unlikely as the origin of the magnetic ordering.

Journal Articles

The SNARE protein SYP71 expressed in vascular tissues is involved in symbiotic nitrogen fixation in ${it Lotus japonicus}$ nodules

Hakoyama, Tsuneo*; Oi, Ryo*; Hazuma, Kazuya*; Suga, Eri*; Adachi, Yuka*; Kobayashi, Mayumi*; Akai, Rie*; Sato, Shusei*; Fukai, Eigo*; Tabata, Satoshi*; et al.

Plant Physiology, 160(2), p.897 - 905, 2012/10

 Times Cited Count:29 Percentile:67.94(Plant Sciences)

Journal Articles

Electronic configuration of Mn ions in the $$pi$$-$$d$$ molecular ferromagnetic $$beta$$-Mn phthalocyanine studied by soft X-ray magnetic circular dichroism

Kataoka, Takashi*; Sakamoto, Yuta*; Yamazaki, Yo*; Singh, V. R.*; Fujimori, Atsushi*; Takeda, Yukiharu; Okochi, Takuo*; Fujimori, Shinichi; Okane, Tetsuo; Saito, Yuji; et al.

Solid State Communications, 152(9), p.806 - 809, 2012/05

 Times Cited Count:19 Percentile:60.56(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Electronic structure of heavy fermion uranium compounds studied by core-level photoelectron spectroscopy

Fujimori, Shinichi; Okochi, Takuo*; Kawasaki, Ikuto; Yasui, Akira; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi; Yamagami, Hiroshi; Haga, Yoshinori; et al.

Journal of the Physical Society of Japan, 81(1), p.014703_1 - 014703_9, 2012/01

 Times Cited Count:37 Percentile:82.27(Physics, Multidisciplinary)

High-energy-resolution core-level and valence-band photoelectron spectroscopic studies were performed for the heavy Fermion uranium compounds UGe$$_2$$, UCoGe, URhGe, URu$$_2$$Si$$_2$$, UNi$$_2$$Al$$_3$$, UPd$$_2$$Al$$_3$$, and UPt$$_3$$ as well as typical localized and itinerant uranium compounds to understand the relationship between the uranium valence state and their core-level spectral line shapes. The core-level spectra of UGe$$_2$$, UCoGe, URhGe, URu$$_2$$Si$$_2$$, and UNi$$_2$$Al$$_3$$ are rather similar to those of itinerant compounds, suggesting that U 5$$f$$ electrons in these compounds are well hybridized with ligand states. On the other hand, the core-level spectra of UPd$$_2$$Al$$_3$$ and UPt$$_3$$ show considerably different spectral line shapes from those of the itinerant compounds, suggesting that U 5$$f$$ electrons in UPd$$_2$$Al$$_3$$ and UPt$$_3$$ are less hybridized with ligand states, leading to the correlated nature of U 5$$f$$ electrons in these compounds.

Journal Articles

Resonant angle-resolved photoelectron spectroscopy of substitutional solid solutions of CeRu$$_2$$Si$$_2$$

Okane, Tetsuo; Kawasaki, Ikuto; Yasui, Akira; Okochi, Takuo*; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; et al.

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA060_1 - SA060_3, 2011/07

 Times Cited Count:1 Percentile:11.37(Physics, Multidisciplinary)

Journal Articles

Band structures of CeRu$$_2$$(Si$$_{1-x}$$Ge$$_{x}$$)$$_2$$ studied by resonant soft X-ray ARPES

Okane, Tetsuo; Okochi, Takuo*; Takeda, Yukiharu; Fujimori, Shinichi; Yasui, Akira; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; Sugi, Motoki*; et al.

Physica Status Solidi (B), 247(3), p.397 - 399, 2010/03

Journal Articles

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Kataoka, Takashi*; Kobayashi, Masaki*; Sakamoto, Yuta*; Song, G. S.*; Fujimori, Atsushi*; Chang, F.-H.*; Lin, H.-J.*; Huang, D. J.*; Chen, C. T.*; Okochi, Takuo*; et al.

Journal of Applied Physics, 107(3), p.033718_1 - 033718_7, 2010/02

AA2009-0977.pdf:1.0MB

 Times Cited Count:53 Percentile:85.88(Physics, Applied)

Journal Articles

Electronic states of magnetic refrigerator materials Mn$$_{0.9}$$Fe$$_{1.1}$$P$$_{0.55}$$As$$_{0.45}$$ using soft X-ray magnetic circular dichroism

Takeda, Yukiharu; Okane, Tetsuo; Okochi, Takuo*; Fujimori, Shinichi; Saito, Yuji; Yamagami, Hiroshi; Yabuta, Hisato*; Takabatake, Toshiro*

Journal of Physics; Conference Series, 200, p.012199_1 - 012199_4, 2010/02

 Times Cited Count:2 Percentile:64.66

no abstracts in English

Journal Articles

Atmospheric deposition, 3; Cloud water and fog deposition

Okochi, Hiroshi*; Katata, Genki

Taiki Kankyo Gakkai-Shi, 45(1), p.A1 - A12, 2010/01

no abstracts in English

Journal Articles

Bulk 5$$f$$ electronic states of the uranium monochalcogenide US as seen via soft X-ray photoemission

Takeda, Yukiharu; Okane, Tetsuo; Okochi, Takuo*; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi*; Ochiai, Akira*

Physical Review B, 80(16), p.161101_1 - 161101_4, 2009/10

 Times Cited Count:8 Percentile:36.69(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Element and orbital-specific observation of two-step magnetic transition in NpNiGa$$_5$$; X-ray magnetic circular dichroism study

Okane, Tetsuo; Okochi, Takuo*; Inami, Toshiya; Takeda, Yukiharu; Fujimori, Shinichi; Kawamura, Naomi*; Suzuki, Motohiro*; Tsutsui, Satoshi*; Yamagami, Hiroshi; Fujimori, Atsushi; et al.

Physical Review B, 80(10), p.104419_1 - 104419_7, 2009/09

 Times Cited Count:6 Percentile:29.57(Materials Science, Multidisciplinary)

Journal Articles

Observation of itinerant Ce 4$$f$$ electronic states in CeIrSi$$_3$$ studied by angle-resolved Ce 3$$drightarrow 4f$$ resonance photoemission spectroscopy

Okochi, Takuo*; Toshimitsu, Takafumi*; Yamagami, Hiroshi; Fujimori, Shinichi; Yasui, Akira; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi; Miyauchi, Yuichiro*; et al.

Journal of the Physical Society of Japan, 78(8), p.084802_1 - 084802_6, 2009/08

 Times Cited Count:10 Percentile:54.7(Physics, Multidisciplinary)

We have applied angle-resolved Ce 3$$d{rightarrow}$$4$$f$$ resonance photoemission spectroscopy to the non-centrosymmetric pressure-induced superconductor CeIrSi$$_3$$ and obtained the 4$$f$$ band-structure and Fermi surfaces. We have found that the Ce 4$$f$$ states are located mainly near the Fermi level and that the photoemission intensity derived from the dispersive conduction bands across the Fermi level shows considerable resonant enhancement. In addition, the band structure and Fermi surfaces of CeIrSi$$_3$$ are different from those of the non-$$f$$ reference compound, LaIrSi$$_3$$ and the difference is well explained by the band structure calculated within the local density approximation (LDA). These results strongly suggest that the Ce 4$$f$$ electrons in CeIrSi$$_3$$ are well hybridized with conduction bands and form itinerant electronic states.

Journal Articles

Nature of magnetic coupling between Mn ions in as-grown Ga$$_{1-x}$$Mn$$_{x}$$As studied by X-ray magnetic circular dichroism

Takeda, Yukiharu; Kobayashi, Masaki*; Okane, Tetsuo; Okochi, Takuo*; Okamoto, Jun*; Saito, Yuji; Kobayashi, Keisuke*; Yamagami, Hiroshi; Fujimori, Atsushi*; Tanaka, Arata*; et al.

Hoshako, 22(4), p.202 - 209, 2009/07

no abstracts in English

Journal Articles

Experimental observation of bulk band dispersions in the oxide semiconductor ZnO using soft X-ray angle-resolved photoemission spectroscopy

Kobayashi, Masaki*; Song, G.-S.*; Kataoka, Takashi*; Sakamoto, Yuta*; Fujimori, Atsushi; Okochi, Takuo*; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Yamagami, Hiroshi; et al.

Journal of Applied Physics, 105(12), p.122403_1 - 122403_4, 2009/06

BB2009-1947.pdf:0.84MB

 Times Cited Count:11 Percentile:45.02(Physics, Applied)

Journal Articles

Hybridization between the conduction band and 3$$d$$ orbitals in the oxide-based diluted magnetic semiconductor In$$_{2-x}$$V$$_x$$O$$_3$$

Kobayashi, Masaki*; Ishida, Yukiaki*; Hwang, J. I.*; Song, G. S.*; Takizawa, Masaru*; Fujimori, Atsushi; Takeda, Yukiharu; Okochi, Takuo*; Okane, Tetsuo; Saito, Yuji; et al.

Physical Review B, 79(20), p.205203_1 - 205203_5, 2009/05

 Times Cited Count:7 Percentile:33.25(Materials Science, Multidisciplinary)

Journal Articles

4$$f$$-derived Fermi surfaces of CeRu$$_2$$(Si$$_{1-x}$$Ge$$_{x}$$)$$_2$$ near the quantum critical point; Resonant soft-X-ray ARPES study

Okane, Tetsuo; Okochi, Takuo*; Takeda, Yukiharu; Fujimori, Shinichi; Yasui, Akira; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; Sugi, Motoki*; et al.

Physical Review Letters, 102(21), p.216401_1 - 216401_4, 2009/05

 Times Cited Count:27 Percentile:77.18(Physics, Multidisciplinary)

Journal Articles

${it TOO MUCH LOVE}$, a root regulator associated with the long-distance control of nodulation in ${it Lotus japonicus}$

Magori, Shimpei*; Kira, Erika*; Shibata, Satoshi*; Umehara, Yosuke*; Kochi, Hiroshi*; Hase, Yoshihiro; Tanaka, Atsushi; Sato, Shusei*; Tabata, Satoshi*; Kawaguchi, Masayoshi*

Molecular Plant-Microbe Interactions, 22(3), p.259 - 268, 2009/03

 Times Cited Count:101 Percentile:92.51(Biochemistry & Molecular Biology)

Legume plants tightly control the development and number of symbiotic root nodules. In ${it Lotus japonicus}$, this regulation required ${it HAR1}$ in the shoots, suggesting that a long-distance communication between the shoots and the roots may exist. To better understand its molecular basis, we isolated and characterized a novel hypernodulating mutant of ${it L. japonicus}$ named ${it too much love}$ (${it tml}$). Reciprocal grafting with wild type showed that ${it tml}$ hypernodulation is determined by the root genotype. Moreover, grafting a ${it har1}$ shoot onto a ${it tml}$ rootstock did not exhibit any obvious additive effects on the nodule number. These observations indicate that a shoot factor ${it HAR1}$ and a root factor ${it TML}$ participate in the same genetic pathway which governs the long-distance signaling of nodule number control. ${it TML}$ may function downstream of ${it HAR1}$ and the gene product ${it TML}$ might serve as a receptor or mediator of unknown mobile signal molecules that are transported from the shoots to the roots.

Journal Articles

Observation of 5$$f$$ electrons in the itinerant limit; Three-dimensional electronic structure of UB$$_2$$

Okochi, Takuo; Fujimori, Shinichi; Yamagami, Hiroshi*; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika*

Physical Review B, 78(16), p.165110_1 - 165110_5, 2008/10

 Times Cited Count:29 Percentile:72.85(Materials Science, Multidisciplinary)

We have derived the three dimensional band structure and Fermi surfaces of itinerant uranium compound UB$$_2$$ by soft X-ray angle resolved photoelectron spectroscopy. We have observed clear energy dispersions and Fermi surfaces with large contribution from U 5$$f$$ states. The obtained results have been compared with the result of band-structure calculation within the local density functional approximation as well as the results of dHvA study. The qualitative agreement has been obtained in the size and topology of the Fermi surfaces with the band structure calculation and the dHvA measurement. Meanwhile, their band structure near the Fermi level is slightly different from the calculation. This might be due to a dynamic renormalization beyond the LDA band calculations even in the very itinerant 5$$f$$ compound.

Journal Articles

Soft X-ray absorption and photoemission studies of ferromagnetic Mn-implanted 3$$C$$-SiC

Song, G.*; Kobayashi, Masaki*; Hwang, J. I.*; Kataoka, Takashi*; Takizawa, Masaru*; Fujimori, Atsushi; Okochi, Takuo; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; et al.

Japanese Journal of Applied Physics, 47(9), p.7113 - 7116, 2008/09

 Times Cited Count:3 Percentile:14.43(Physics, Applied)

59 (Records 1-20 displayed on this page)