Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Hitoshi Ohkuni"'
Autor:
Hitoshi Ohkuni, E. Yamamoto, Yoshihiko Inada, Yoshichika Onuki, Yoshinori Haga, Rikio Settai, Miho Nakashima
Publikováno v:
Journal of Physics: Condensed Matter. 15:S2011-S2014
We carried out a de Haas–van Alphen (dHvA) experiment under pressure on a heavy-fermion superconductor, URu2Si2. The dHvA frequency, which corresponds to a nearly spherical Fermi surface, increases slightly with increasing pressure, while the corre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a7af33aa94a2647c457094708c99f73
https://doi.org/10.1088/0953-8984/15/28/316
https://doi.org/10.1088/0953-8984/15/28/316
Autor:
Yoshichika Ōnuki, Rikio Settai, E. Yamamoto, Yoshinori Haga, H. Aoki, Noriaki Kimura, Hitoshi Ohkuni, Yoshihiko Inada
Publikováno v:
Physica B: Condensed Matter. 280:276-280
The f-electron systems of the cerium and uranium compounds have attracted attention in the context of heavy fermion and anisotropic superconductivity. We clarified an itinerant f-electron nature for UPt 3 by the de Haas–van Alphen experiments, dete
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c6115e2cfbcd7bd1c8b271742a6bba80
https://doi.org/10.1016/s0921-4526(99)01684-1
https://doi.org/10.1016/s0921-4526(99)01684-1
Autor:
Yoshinori Haga, Tetsuo Honma, Satoshi Tsutsui, Etsuji Yamamoto, M. Nakada, Yoshichika Ōnuki, Hitoshi Ohkuni, Saburo Nasu
Publikováno v:
Hyperfine Interactions. 126:335-340
We have performed 238U Mossbauer spectroscopy of uranium-based heavy fermion superconductors, UPd2Al3 and URu2Si2, in order to investigate their physical properties, mainly their magnetic properties. The slow relaxation of magnetic hyperfine interact
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::85e92d2338f379c50f6fea51a3be8684
https://doi.org/10.1023/a:1012626913681
https://doi.org/10.1023/a:1012626913681
Autor:
Takahiro Ito, Hiroshi Kumigashira, Yoshichika Onuki, T. Takahashi, Hitoshi Ohkuni, Yoshinori Haga, Tetsuo Honma, E. Yamamoto
Publikováno v:
Physical Review B. 60:13390-13395
We have performed a high-resolution angle-resolved photoemission spectroscopy (ARPES) on single-crystal ${\mathrm{URu}}_{2}{\mathrm{Si}}_{2}$ to study the band structure and the Fermi surface in the paramagnetic phase. The valence-band structure cons
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c22b199d5983535ae60221ddc414f88
https://doi.org/10.1103/physrevb.60.13390
https://doi.org/10.1103/physrevb.60.13390
Autor:
Etsuji Yamamoto, Hitoshi Ohkuni, Koichi Kindo, Yoshinori Haga, Kiyohiro Sugiyama, Tetsuo Honma, Yoshichika Onuki, Miho Nakashima
Publikováno v:
Journal of the Physical Society of Japan. 68:3394-3401
We have carried out the magnetization measurements in high magnetic fields up to 60 T and in the wide temperature range from 1.3 to 77 K for a heavy femion superconductor URu 2 Si 2 . A sharp metamagnetic transition with three steps is found below 14
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c850a45d4a436f905e08ed0c8f726dc8
https://doi.org/10.1143/jpsj.68.3394
https://doi.org/10.1143/jpsj.68.3394
Autor:
Hitoshi Ohkuni, Saburo Takahashi, Hiroshi Yamagami, Yoshihiko Inada, Yoshichika Ōnuki, Tetsuo Honma, Yoshifumi Tokiwa, E. Yamamoto, Takashi Yanagisawa, K. Sakurai, Yoshinori Haga, Rikio Settai
Publikováno v:
Philosophical Magazine B. 79:1045-1077
We have succeeded in growing a high-quality single crystal of URu2Si2 with a residual resistivity ratio of 255 and performed magnetoresistance and de Haas–van Alphen (dHvA) experiments. The dHvA oscillations were observed clearly in both the normal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bc6e3d5668d4de877210f3d8868a0485
https://doi.org/10.1080/13642819908214859
https://doi.org/10.1080/13642819908214859
Autor:
Etsuji Yamamoto, Hitoshi Ohkuni, N. Suzuki, Yoshichika Onuki, Yoshinori Haga, Tetsuo Honma, Y. Koike, Naoto Metoki
Publikováno v:
Journal of the Physical Society of Japan. 68:338-341
Neutron scattering experiments have been carried out for a heavy fermion superconductor URu 2 Si 2 . We found that the (1 0 0) magnetic Bragg peak intensity is reduced by 1–2% in magnitude below the superconducting transition temperature of 1.15 K.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09150f7cd3ba74596cbaecb86818b57a
https://doi.org/10.1143/jpsj.68.338
https://doi.org/10.1143/jpsj.68.338
Autor:
Yoshinori Haga, Masato Hedo, Tetsuo Honma, K. Sakurai, Hitoshi Ohkuni, Yoshihumi Tokiwa, Yoshichika Ōnuki, E. Yamamoto, Saburo Takahashi, Yoshihiko Inada
Publikováno v:
Physica B: Condensed Matter. :1060-1065
We succeeded in growing high-quality single crystals of CeRu 2 and URu 2 Si 2 and observed the de Haas–van Alphen (dHvA) oscillations in both the normal and superconducting mixed states. The dHvA frequency does not change in magnitude between the n
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6328ac08df15f603bdfedb9d7ec2adb5
https://doi.org/10.1016/s0921-4526(98)01164-8
https://doi.org/10.1016/s0921-4526(98)01164-8
Autor:
Dai Aoki, Yoshinori Haga, Hitoshi Ohkuni, Yoshichika Ōnuki, Tatsuma D. Matsuda, Eetsuji Yamamoto, Shugo Ikeda, Rikio Settai
Publikováno v:
Journal of the Physical Society of Japan. 77:362-364
We succeeded in growing a high-quality single crystal of URu 2 Si 2 by the Czochralski pulling method and applying the solid state electro-transport method under ultrahigh vacuum. The sample quality strongly depends on the position in the ingot. For
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5d5485774e697e4c5f2398747a21ef5a
https://doi.org/10.1143/jpsjs.77sa.362
https://doi.org/10.1143/jpsjs.77sa.362
Autor:
Tatsuma D. Matsuda, Alexander V. Andreev, Ladislav Havela, K. Miyake, Vladimir Sechovsky, Hideyuki Sato, Yuji Aoki, Rikio Settai, Hitoshi Sugawara, Yoshinori Haga, Hiroaki Ikeda, Y. O¯nuki, E. Yamamoto, Hitoshi Ohkuni
Publikováno v:
Journal of Magnetism and Magnetic Materials. :271-276
In order to investigate the metamagnetic anomaly (MA) observed in several heavy-fermion compounds, field dependence of specific heat C(B) and magnetocaloric effect have been measured in the prototypical 4f-electron compound CeRu2Si2, and compared to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::54d3d7fd7d3d50f2df62b44f8506360b
https://doi.org/10.1016/s0304-8853(97)00484-8
https://doi.org/10.1016/s0304-8853(97)00484-8