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Ni
In
Sakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Zhu, J.-X.*; Ronning, F.*; Thompson, J. D.*; Kotegawa, Hisashi*; To, Hideki*; Suzuki, Kohei*; Oshima, Yoshiki*; et al.
Physical Review B, 106(23), p.235152_1 - 235152_8, 2022/12
Times Cited Count：1 Percentile：9.28(Materials Science, Multidisciplinary)We investigate the electronic state of Ni-substituted CeCoNi
In by nuclear quadrupole and magnetic resonance (NQR/NMR) techniques. The heavy fermion superconductivity below 
K for 
is suppressed by Ni substitutions, and 
reaches zero for 
. The 
In NQR spectra for 
and 0.25 can be explained by simulating the electrical field gradient that is calculated for a virtual supercell with density functional theory. The spin-lattice relaxation rate 
indicates that Ni substitution weakens antiferromagnetic correlations that are not localized near the substituent but instead are uniform in space. The temperature (
) dependence of 
for shows a maximum around 
K and decreases toward almost zero when temperature is further reduced as if a gap might be opening in the magnetic excitation spectrum; however, the magnetic specific heat and the static magnetic susceptibility evolve smoothly through 
with a 
dependence. The peculiar T dependence of and non-Fermi-liquid specific heat and susceptibility can be interpreted in a unified way by assuming nested antiferromagnetic spin fluctuations in a quasi-two-dimensional electronic system.
Nakamura, Shoji; Kimura, Atsushi; Hales, B. P.; Iwamoto, Osamu; Shibahara, Yuji*; Uehara, Akihiro*; Fujii, Toshiyuki*
JAEA-Conf 2018-001, p.199 - 203, 2018/12
Study on cross-section measurements has been promoted for 
Cs among long-lived fission products in ImPACT Project. The feasibility study on 
Se sample preparation also has been conducted to measure its cross sections in future. During the feasibility study, we started the neutron-capture cross-section measurements of stable Se isotopes. This paper reports research progresses on preparation of a radioactive Cs sample, neutron irradiation experiments with the Cs sample, and cross-section measurements of stable Se isotopes.
symmetry in CeCu
Ge; Soft X-ray absorption and hard X-ray photoemission spectroscopyAratani, Hidekazu*; Nakatani, Yasuhiro*; Fujiwara, Hidenori*; Kawada, Moeki*; Kanai-Nakata, Yuina*; Yamagami, Kohei*; Fujioka, Shuhei*; Hamamoto, Satoru*; Kuga, Kentaro*; Kiss, Takayuki*; et al.
Physical Review B, 98(12), p.121113_1 - 121113_6, 2018/09
Times Cited Count：5 Percentile：23.50(Materials Science, Multidisciplinary)Nakamura, Shoji; Kimura, Atsushi; Hales, B. P.; Iwamoto, Osamu; Tsubata, Yasuhiro; Matsumura, Tatsuro; Shibahara, Yuji*; Uehara, Akihiro*; Fujii, Toshiyuki*
JAEA-Conf 2017-001, p.15 - 22, 2018/01
Neutron nuclear data of long lived fission products (LLFPs) have been required as basic data for the technology of reduce environmental impact involved in high level radioactive wastes (HLW). The innovative large project called by "Impusing Paradigm Change through Disruptive Technologies Program: ImPACT" have been started from October, 2014. In the ImPACT project, some research groups of JAEA engaged in the Project No.2 (Nuclear Reaction Data Measurements), and have started measurements of neutron capture cross-section at J-PARC/MLF/ANNRI. In our research, we selected cesium-135 (Cs) nuclide (half life: 2.3
10
yr.) among LLFPs in the HLW, and decided to measure the neutron capture cross-sections of Cs. When measurement, the Cs sample might contained cecium-137 (
Cs) as impurities because it's impossible to chemically separate each other. To measure the cross-sections of Cs, there should be also needed to know the cross-sections of Cs. In this work, sample maintenance also has been examined especially for selen-79 (Se) nuclide among LLFPs having difficulty in sample preparations. In this oral session, the outline of our research project will be presented together with a research motivation, situations of past reported data, total schedules, progress, future plans, and some of high light data for neutron capture cross-section measurements.
; NQR relaxation ratesSakai, Hironori; Ronning, F.*; Hattori, Takanori; Tokunaga, Yo; Kambe, Shinsaku; Zhu, J.-X.*; Wakeham, N.*; Yasuoka, Hiroshi; Bauer, E. D.*; Thompson, J. D.*
Journal of Physics; Conference Series, 807(3), p.032001_1 - 032001_6, 2017/04
Times Cited Count：3 Percentile：66.52(Physics, Condensed Matter)We have used nuclear quadrupole resonance (NQR) to probe microscopically the response of a prototypical quantum critical metal CeCoIn to substitutions of small amounts of Cd for In. Approximately half of the Cd substituents induce local Ce moments in their close proximity, as observed by site-dependent longitudinal nuclear spin relaxation rates . To reaffirm that localized 
moments are induced around the Cd substituents, we find a Gaussian spin-echo decay rate 
of transverse nuclear spin relaxation. Further, 
for the NQR subpeak is found to be proportional to temperatures, again indicating local moments fluctuations around the Cd substituents, while that for the NQR main peak shows a 
-dependence. The latter temperature dependence is close to 0.75 in pure CeCoIn and indicates that the bulk electronic state is located close to a two dimensional quantum critical instability.
(T=Ir and Co) and analysis of the energy bands by using tight-binding methodMaehira, Takahiro; Hotta, Takashi; Ueda, Kazuo; Hasegawa, Akira*
Journal of the Physical Society of Japan, 72(4), p.854 - 864, 2003/04
Times Cited Count：75 Percentile：90.01(Physics, Multidisciplinary)In order to investigate electronic properties of recently discovered heavy fermion superconductors CeTIn (T=Ir and Co), we employ the relativistic linear augmented-plane-wave (RLAPW) method to clarify the energy band structures and Fermi surfaces of those materials.The obtained energy bands mainly due to the large hybridization between Ce 
and In 5
states well reproduce the Fermi surfaces consistent with the de Haas-van Alphen experimental results. For the purpose, we construct a tight-binding model for CeTIn by including - and - hoppings as well as - hybridization, which are expressed by the Slater-Koster integrals, determined by the direct comparison with the band-calculation result. Similarity and difference between CeIrIn and CeCoIn are discussed based on the obtained tight-binding model, suggesting a significant importance of the effect of crystalline electric field to understand the difference in electronic properties among CeTIn.
Iwai, Yasunori; Misaki, Yonosuke*; Hayashi, Takumi; Yamanishi, Toshihiko; Konishi, Satoshi; Nishi, Masataka; Ninomiya, R.*; Yanagimachi, S.*; Senrui, S.*; Yoshida, Hiroshi
Fusion Science and Technology, 41(3), p.1126 - 1130, 2002/05
no abstracts in English
Sakamoto, Yoshiaki; Takebe, Shinichi; Ogawa, Hiromichi; Muraoka, Susumu; Ishii, Tomoaki*; Inagawa, Satoshi*; Gunji, Yasuyoshi*
Materials Research Society Symposium Proceedings, Vol.663, p.1207 - 1214, 2001/00
no abstracts in English
Iwai, Yasunori; Yoshida, Hiroshi; Yamanishi, Toshihiko; Senrui, S.*; Nishi, Masataka
Fusion Engineering and Design, 49-50, p.847 - 853, 2000/11
Times Cited Count：17 Percentile：71.54(Nuclear Science & Technology)no abstracts in English
Kim, E.; Endo, Akira; Yamaguchi, Yasuhiro; Yoshizawa, Michio; Nakamura, Takashi*; Shiomi, T.*
Proceedings of 10th International Congress of the International Radiation Protection Association (IRPA-10) (CD-ROM), 6 Pages, 2000/05
no abstracts in English
Meigo, Shinichiro
Nuclear Instruments and Methods in Physics Research A, 401, p.365 - 378, 1997/00
Times Cited Count：61 Percentile：95.83(Instruments & Instrumentation)no abstracts in English
Arita, Tadaaki; Yamanishi, Toshihiko; Iwai, Yasunori; Okuno, Kenji; Kobayashi, Noboru*; Yamamoto, Ichiro*
Fusion Technology, 30(3), p.864 - 868, 1996/12
no abstracts in English
Iwai, Yasunori; Yamanishi, Toshihiko; Okuno, Kenji; Yokogawa, Nobuhisa*; ; Yoshida, Hiroshi; O.K.Kveton*
Journal of Nuclear Science and Technology, 33(12), p.981 - 992, 1996/12
Times Cited Count：28 Percentile：89.28(Nuclear Science & Technology)no abstracts in English
Yamai, Hideki*; Konishi, Satoshi; Hara, Masahide*; Okuno, Kenji; Yamamoto, Ichiro*
Fusion Technology, 28(3), p.1591 - 1596, 1995/10
no abstracts in English
Yamai, Hideki*; Konishi, Satoshi; Yamanishi, Toshihiko; Okuno, Kenji
Fusion Technology, 26(3), p.654 - 658, 1994/11
no abstracts in English
; ; ;
Health Physics, 10(7), p.469 - 472, 1964/00
no abstracts in English
Sakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Ronning, F.*; Zhu, J.-X.*; Suzuki, Kohei*; Oshima, Yoshiki*; Yokoyama, Makoto*
no journal, ,
Dilute substitutions of non-magnetic dopants Zn can induce a long-ranged antiferromagnetic ordering to a heavy fermion superconductor CeCoIn. We have microscopically investigated the Zn-doped CeCoIn by means of the nuclear quadrupole/magnetic resonance (NQR/NMR) techniques.
Sakai, Hironori; Tokunaga, Yo; Haga, Yoshinori; Kambe, Shinsaku; Zhu, J.-X.*; Ronning, F.*; Ramakrishna, S. K.*; Reyes, A. P.*; Suzuki, Kohei*; Oshima, Yoshiki*; et al.
no journal, ,
Substitutions of In sites by Zn atoms in heavy fermion superconductor CeCoIn is reported to induce an antiferromagnetic order by Yokoyama et al. in Ibaraki University. Near the critical region, non-Fermi-liquid behavior has been observed in magnetization and specific heat. We have performed NMR measurements to reveal the spin fluctuations near the critical region.
Sakai, Hironori
no journal, ,
We have performed NMR/NQR experiments for slightly substituted CeCoIn by several substituents of Cd, Zn and Ni. In this presentation, the microscopic electronic states will be discussed.
