Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
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：0 Percentile：0(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.
; In NQR/NMR and 
Co NMR studySakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Zhu, J.-X.*; Ronning, F.*; Thompson, J. D.*; Ramakrishna, S. K.*; Reyes, A. P.*; Suzuki, Kohei*; Oshima, Yoshiki*; et al.
Physical Review B, 104(8), p.085106_1 - 085106_12, 2021/08
Times Cited Count：3 Percentile：27.71(Materials Science, Multidisciplinary)Antiferromagnetism in a prototypical quantum critical metal CeCoIn is known to be induced by slight substitutions of non-magnetic Zn atoms for In. In nominally 7% Zn substituted CeCoIn, an antiferromagnetic (AFM) state coexists with heavy fermion superconductivity. Heterogeneity of the electronic states is investigated in Zn doped CeCoIn by means of nuclear quadrupole and magnetic resonances (NQR and NMR). Site-dependent NQR relaxation rates indicate that the AFM state is locally nucleated around Zn substituents in the matrix of a heavy fermion state, and percolates through the bulk at the AFM transition temperature 
. At lower temperatures, an anisotropic superconducting (SC) gap below the SC transition temperature , and the SC state permeates through the AFM regions via a SC proximity effect. Applying an external magnetic field induces a spin-flop transition near 5 T, reducing the volume of the AFM regions. Consequently, a short ranged inhomogeneous AFM state survives and coexists with a paramagnetic Fermi liquid state at high fields.
-US
Metoki, Naoto; Sakai, Hironori; Suzuki, Michito; Yamamoto, Etsuji; Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo*
JPS Conference Proceedings (Internet), 3, p.013011_1 - 013011_6, 2014/06
Uranium chalcogenides are highly interesting because of the variety of the physical properties from 5
-based metal and Mott-Hibbard insulator. Especially dichalcogenide family exhibits a metal-insulator crossover depending on the chalcogenide elements, or under magnetic field and pressure. In this talk we present a recent result of our neutron scattering study on uranium dichalcogenide, which demonstrates that the metal-insulator crossover is related to the change of 5 character from localized to itinerant. The electronic structure related to this phenomenon is discussed based on the band calculation.
Si; High magnetic field nuclear magnetic resonance to 40 TSakai, Hironori; Urbano, R. R.*; Tokunaga, Yo; Kambe, Shinsaku; Suzuki, Michito; Kuhns, P. L.*; Reyes, A. P.*; Tobash, P. H.*; Ronning, F.*; Bauer, E. D.*; et al.
Physical Review Letters, 112(23), p.236401_1 - 236401_5, 2014/06
Times Cited Count：7 Percentile：49.06(Physics, Multidisciplinary)Very high field 
Si-NMR measurements using a fully Si-enriched URuSi single crystal were carried out in order to microscopically investigate the "hidden order" (HO) state and adjacent magnetic phases in the high field limit. At the lowest measured temperature of 0.4 K, a clear anomaly reflecting a Fermi surface instability near 22 T inside the HO state is detected by the Si shift, 
. Moreover, a strong enhancement of develops near a critical field 
T, and the Si-NMR signal disappears suddenly at 
, indicating the total suppression of the HO state. Nevertheless, a weak and shifted Si-NMR signal reappears for fields higher than at 4.2 K, providing evidence for a magnetic structure within the magnetic phase caused by the Ising-type anisotropy of the uranium ordered moments.
ST13
in the family 
Sugiyama, Tomoyasu*; Sugito, Hironori*; Mamiya, Ko*; Suzuki, Yoshinori*; Ando, Katsuhiko*; Onuki, Toshihiko
Journal of Bioscience and Bioengineering, 113(3), p.367 - 371, 2012/03
Times Cited Count：28 Percentile：67.71(Biotechnology & Applied Microbiology)An isolated strain ST13 was examined for the reducing activity of hexavalent chromium (Cr(VI)). XANES analysis of the precipitate shows the presence of Cr(OH)
, indicating the bacterial reduction of Cr(VI) to trivalent chromium (Cr(III)). The bacterial Cr(VI) reduction was more efficient in minimal medium supplemented with molasses than with glucose. These results strongly suggest that the isolate 
ST13 is a novel actinobacterium with Cr(VI) reducing activity that is stimulated by molasses.
Tokunaga, Yo; Saito, Yo*; Sakai, Hironori; Kambe, Shinsaku; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*; Kawasaki, Yu*; Kishimoto, Yutaka*
Physical Review B, 84(21), p.214403_1 - 214403_7, 2011/12
Times Cited Count：8 Percentile：36.17(Materials Science, Multidisciplinary)We report NMR studies of TbCoGa, which has the tetragonal HoCoGa structure and exhibits two antiferromagnetic (AF) transitions at 
=36.2 K and 
=5.4 K. From a symmetry analysis of internal magnetic fields at orthorhombic Ga sites, we have successfully determined the magnetic structures in the AF-I (
) and AF-II (
) phases. The AF-I phase is a collinear AF order with a propagation vector ![$$q=[1/2, 0, 1/2]$$](/search/images/ERYT0WZRF2ZCYIBQFQQDCLZSLUSA.gif)
and ordered moments parallel to the [001] direction. In the AF-II phase, on the other hand, we found a non-collinear AF structure described by double propagation vectors ![$$q_1=[1/2, 0, 1/2]$$](/search/images/ERYV4MJ3LMYS4MRMEAYCYIBRF2ZF0JA.gif)
and ![$$q_{2}=[0, 1/2, 1/2]$$](/search/images/ERYV44ZSPU4VWMBMEAYS4MRMEAYS4MS3EQ.gif)
, where the moments tilt away from the [001] direction toward [100], keeping a constant value along the [001] direction. In the context of these results we discuss the possible presence of magnetic frustration in this system.
Mn
Te by X-ray fluorescence holographyHappo, Naohisa*; Tekehara, Yuki*; Fujiwara, Makoto*; Tanaka, Koichi*; Semba, Shinya*; Hosokawa, Shinya*; Hayashi, Koichi*; Hu, W.; Suzuki, Motohiro*; Asada, Hironori*
e-Journal of Surface Science and Nanotechnology (Internet), 9, p.247 - 250, 2011/06
MnTe investigated by X-ray fluorescence holographyHappo, Naohisa*; Tekehara, Yuki*; Fujiwara, Makoto*; Tanaka, Koichi*; Semba, Shinya*; Hosokawa, Shinya*; Hayashi, Koichi*; Hu, W.; Suzuki, Motohiro*; Asada, Hironori*
Japanese Journal of Applied Physics, 50(5), p.05FC11_1 - 05FC11_2, 2011/05
Times Cited Count：5 Percentile：23.4(Physics, Applied)Horiguchi, Hironori; Nakamura, Takemi; Kumada, Hiroaki*; Yanagie, Hironobu*; Suzuki, Minoru*; Sagawa, Hisashi
Proceedings of 14th International Congress on Neutron Capture Therapy (ICNCT-14) (CD-ROM), p.234 - 237, 2010/10
Recurrent breast cancer has been considered the application for boron neutron capture therapy using the JRR-4. The investigation of irradiation conditions for the recurrent breast cancer was performed by simulation with the JCDS. We performed the preliminary dosimetry of the model to verify the efficient irradiation conditions such as the neutron energy modes and multiple field technique. From the result, when the 30 Gy-Eq dose as minimum dose was delivered to the cancers, comparable dose distribution was delivered at the healthy tissues by both a one-port irradiation from anterior direction and a two-port irradiation from tangential direction. We revealed that the two-port irradiation was not valid to reduce the healthy tissues dose due to the isotopic scattering of neutrons in the body. We concluded that the optimal irradiation condition was the one-port irradiation with thermal neutron beam mode in terms of less healthy tissues dose and shorter irradiation time.
Pr nuclear spin dynamics in PrPb
; 
La NMR study in Pr
La
PbTokunaga, Yo; Sakai, Hironori; Chudo, Hiroyuki; Kambe, Shinsaku; Yasuoka, Hiroshi; Suzuki, Hiroyuki*; Walstedt, R. E.*; Homma, Yoshiya*; Aoki, Dai*; Shiokawa, Yoshinobu*
Physical Review B, 82(10), p.104401_1 - 104401_6, 2010/09
Times Cited Count：5 Percentile：26.3(Materials Science, Multidisciplinary)La NMR studies have been performed on PrPb substituted with 3% La. The temperature dependence of the local magnetic susceptibility around La ions has been extracted from the La Knight shift. These data show that the non-magnetic 
crystalline-electric-field (CEF) ground state (GS) is preserved even at the nearest neighboring Pr ions, although their CEF level scheme is slightly modified due to the La substitution. On the other hand, the temperature dependence of the nuclear spin-lattice relaxation rate is found to be well reproduced by assuming the same CEF level scheme over a wide temperature range. However, shows a strong upturn below 10 K, which is not expected from the non-magnetic CEF GS. We show that the low temperature anomaly can be quantitatively understood in terms of a cross-relaxation process between Pr and La nuclear spins.
Oba, Hironori; Suzuki, Hiroshi*; Esaka, Fumitaka; Taguchi, Tomitsugu; Yamada, Yoichi; Yamamoto, Hiroyuki; Sasase, Masato*; Yokoyama, Atsushi
Journal of the Vacuum Society of Japan, 52(6), p.292 - 295, 2009/07
no abstracts in English
Yogo, Akifumi; Sato, Katsutoshi; Nishikino, Masaharu; Mori, Michiaki; Teshima, Teruki*; Numasaki, Hodaka*; Murakami, Masao*; Demizu, Yusuke*; Akagi, Takashi*; Nagayama, Shinichi*; et al.
Applied Physics Letters, 94(18), p.181502_1 - 181502_3, 2009/05
Times Cited Count：110 Percentile：94.75(Physics, Applied)Tokunaga, Yo; Suzuki, Hiroyuki*; Sakai, Hironori; Chudo, Hiroyuki; Kambe, Shinsaku; Yasuoka, Hiroshi; Homma, Yoshiya*; Aoki, Dai*; Shiokawa, Yoshinobu*
Journal of Physics; Conference Series, 150, p.042211_1 - 042211_4, 2009/00
Times Cited Count：2 Percentile：74.15(Thermodynamics)The first La-NMR measurement has been carried out on a La dilute system of PrPb. We have succeeded to detect La-NMR signal on a powder sample of PrLaPb and extracted the temperature dependence of the Knight shift 
in a temperature range between 1.5 and 220 K. has been found to maintain a linear relation with the bulk-susceptibility 
in wide temperature range, except for a small deviation in the temperature region below 6 K. The slopes of the 
vs 
plots yield for the hyperfine coupling constants 
the value 375 Oe/
. From the NMR results, we discuss the effect of the La substitutions on microscopic magnetic properties of PrPb.
CMatsumura, Takeshi*; Inami, Toshiya; Kosaka, Masashi*; Kato, Yoshiaki*; Inukai, Takaki*; Ochiai, Akira*; Nakao, Hironori*; Murakami, Yoichi*; Katano, Susumu*; Suzuki, Hiroyuki*
Journal of the Physical Society of Japan, 77(10), p.103601_1 - 103601_4, 2008/10
Times Cited Count：14 Percentile：62.95(Physics, Multidisciplinary)
nucleus 
CrOnishi, Takeo*; Gelberg, A.*; Sakurai, Hiroyoshi*; Yoneda, Kenichiro*; Aoi, Nori*; Imai, Nobuaki*; Baba, Hidetada*; Von Brentano, P.*; Fukuda, Naoki*; Ichikawa, Yuichi*; et al.
Physical Review C, 72(2), p.024308_1 - 024308_7, 2005/08
Times Cited Count：21 Percentile：77.65(Physics, Nuclear)no abstracts in English
Morita, Kenji*; Suzuki, Hironori*; Soda, Kazuo*; Iwahara, Hiroiku*; Nakamura, Hirofumi; Hayashi, Takumi; Nishi, Masataka
Journal of Nuclear Materials, 307-311(2), p.1461 - 1465, 2002/12
Times Cited Count：2 Percentile：17.03(Materials Science, Multidisciplinary)no abstracts in English
Yamaki, Tetsuya; Kawahito, Shimpei; Sawada, Shinichi; Asano, Masaharu; Ishiguro, Hironori*; Mohammad Ali, A.*; Nakagawa, Nobuyoshi*; Suzuki, Akihiro*; Terai, Takayuki*; Maekawa, Yasunari
no journal, ,
no abstracts in English
Yamaki, Tetsuya; Kawahito, Shimpei; Sawada, Shinichi; Asano, Masaharu; Ishiguro, Hironori*; Mohammad Ali, A.*; Nakagawa, Nobuyoshi*; Suzuki, Akihiro*; Terai, Takayuki*
no journal, ,
no abstracts in English
Komeda, Masao; Horiguchi, Hironori; Yamamoto, Kazuyoshi; Kumada, Hiroaki; Suzuki, Minoru*
no journal, ,
no abstracts in English
LaPbTokunaga, Yo; Suzuki, Hiroyuki*; Sakai, Hironori; Kambe, Shinsaku; Chudo, Hiroyuki; Homma, Yoshiya*; Aoki, Dai*; Shiokawa, Yoshinobu*
no journal, ,
no abstracts in English
