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Suzuki, Shintaro*; Takubo, Ko*; Kuga, Kentaro*; Higemoto, Wataru; Ito, Takashi; Tomita, Takahiro*; Shimura, Yasumichi*; Matsumoto, Yosuke*; Bareille, C.*; Wadachi, Hiroki*; et al.
Physical Review Research (Internet), 3(2), p.023140_1 - 023140_12, 2021/05
We report our experimental discovery of the transition temperature reaching 20 K in a Yb-based compound at ambient pressure. The Mn substitution at the Al site in an intermediate valence state of 
-YbAlB
not only induces antiferromagnetic transition at a record high temperature of 20 K but also transforms the heavy-fermion liquid state in -YbAlB into a highly resistive metallic state proximate to a Kondo insulator.
Ru M
ssbauer parameters of ruthenium-nitrosyl complexesKaneko, Masashi; Kato, Akane*; Nakashima, Satoru*; Kitatsuji, Yoshihiro
Inorganic Chemistry, 58(20), p.14024 - 14033, 2019/10
Times Cited Count：12 Percentile：63.71(Chemistry, Inorganic & Nuclear)We applied density functional theory calculations to ruthenium-nitrosyl complexes, which are known to exist in high-level radioactive waste, to give a theoretical correlation between Ru Mssbauer spectroscopic parameters (
and 
) and ligand field strength (
) for the first time. The structures of the series of complexes, [Ru(NO)L
] (L = Br
, Cl, NH
, CN), were modeled based on the corresponding single-crystal X-ray coordinates. The comparisons of the geometries and total energies between the different spin states suggested that the singlet spin state of [Ru(II)(NO
)L] complexes were the most stable. The calculated results of both the and values reproduced the experimental results by reported previously and increased in the order of L = Br, Cl, NH, CN. Finally, we estimated the ligand field strength () based on molecular orbitals, assuming C
symmetry and showed the increase of values in that order, being consistent with well-known spectrochemical series of ligands. The increase attributes to the strengthening of the abilities of 
-donor and 
-acceptor of the L-ligands to the Ru atom, resulting in the increase of the values.
Toyomori, Yuka*; Tsuji, Satoru*; Mitsuda, Shinobu*; Okayama, Yoichi*; Ashida, Shiomi*; Mori, Atsunori*; Kobayashi, Toru; Miyazaki, Yuji; Yaita, Tsuyoshi; Arae, Sachie*; et al.
Bulletin of the Chemical Society of Japan, 89(12), p.1480 - 1486, 2016/09
Times Cited Count：8 Percentile：29.47(Chemistry, Multidisciplinary)-YbAlB at high magnetic fieldsTerashima, Taku*; Matsuda, Yasuhiro*; Kuga, Kentaro*; Suzuki, Shintaro*; Matsumoto, Yosuke*; Nakatsuji, Satoru*; Kondo, Akihiro*; Kindo, Koichi*; Kawamura, Naomi*; Mizumaki, Masaichiro*; et al.
Journal of the Physical Society of Japan, 84(11), p.114715_1 - 114715_4, 2015/11
Times Cited Count：4 Percentile：34.89(Physics, Multidisciplinary)
Pr nuclear spin dynamics associated with antiferroquadrupolar order in PrV
Al
Ito, Takashi; Higemoto, Wataru; Sakai, Akito*; Nakatsuji, Satoru*; Tsujimoto, Masaki*
Physical Review B, 92(12), p.125151_1 - 125151_5, 2015/09
Times Cited Count：5 Percentile：23.78(Materials Science, Multidisciplinary)Uematsu, Daisuke*; Sagayama, Hajime*; Arima, Takahisa*; Ishikawa, Jun*; Nakatsuji, Satoru*; Takagi, Hidenori*; Yoshida, Masahiro*; Mizuki, Junichiro; Ishii, Kenji
Physical Review B, 92(9), p.094405_1 - 094405_6, 2015/09
Times Cited Count：22 Percentile：66.77(Materials Science, Multidisciplinary)-YbAl
Fe
B (
) at low temperatures and high magnetic fieldsTerashima, Taku*; Matsuda, Yasuhiro*; Kuga, Kentaro*; Suzuki, Shintaro*; Matsumoto, Yosuke*; Nakatsuji, Satoru*; Kondo, Akihiro*; Kindo, Koichi*; Kawamura, Naomi*; Mizumaki, Masaichiro*; et al.
Journal of Physics; Conference Series, 592(1), p.012020_1 - 012020_6, 2015/03
Times Cited Count：1 Percentile：43.19(Physics, Atomic, Molecular & Chemical)Valence fluctuation phenomena in rare-earth intermetallic compounds have attracted attention because the quantum criticality of the valence transition has been proposed theoretically. Recently, it was found that 
-YbAlB shows quantum criticality without tuning and has a strong mixed-valence state. In this study, we measured the magnetization curve and X-ray magnetoabsorption in -YbAlFeB (), which is a locally isostructural polymorph of -YbAlB. The magnetization and X-ray experiments were performed in fields up to 55 and 40 T, respectively. A small increase in the Yb valence was observed at fields where the magnetization curve exhibited a change in slope.
-
hybridization effect in PrTiAl and PrVAlTokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Sakai, Akito*; Nakatsuji, Satoru*; Harima, Hisatomo*
Physical Review B, 88(8), p.085124_1 - 085124_7, 2013/08
Times Cited Count：30 Percentile：75.39(Materials Science, Multidisciplinary)By means of 
Al NMR studies, we have investigated magnetic excitations and the hybridization effect between Pr 4 and conduction electrons in a pair of cubic compounds Pr
Al (=Ti, V). From Knight shift measurements we have evaluated comparative strengths for the - hybridization effect in these compounds and confirm a definite increase of hybridization on replacing Ti with V. Analysis of the spin-lattice relaxation rate 
reveals that the spectral width of magnetic fluctuations in crystalline electric field excited states is strongly temperature dependent. This result indicates that magnetic fluctuations are dominated by the strong - exchange coupling at high temperatures and thus is nicely consistent with the Kondo picture that features ln
dependence of resistivity over the same temperature region.
- and -TbAlB at low temperature and high magnetic fieldsMatsuda, Yasuhiro*; Nakamura, Toshiyuki*; Kuga, Kentaro*; Nakatsuji, Satoru*; Michimura, Shinji*; Inami, Toshiya; Kawamura, Naomi*; Mizumaki, Masaichiro*
Journal of the Korean Physical Society, 62(12), p.1778 - 1781, 2013/06
Times Cited Count：10 Percentile：55.98(Physics, Multidisciplinary)The valence state of Yb ions in - and -YbAlB has been investigated by X-ray absorption and emission spectroscopy at temperatures from 2 to 280 K. It is found that the valence gradually increases with increasing temperature toward 3+ and that the characteristic temperature of the valence fluctuations is about 290 K. We also observe a small increase in the Yb valence (
0.002) in -YbAlB by a magnetic field of 32 T at 40 K.
ground quartet systems Sm
Al (: Ti, V, Cr)Ito, Takashi; Higemoto, Wataru; Ninomiya, Kazuhiko; Sakai, Akito*; Nakatsuji, Satoru*
Journal of the Physical Society of Japan, 81(Suppl.B), p.SB050_1 - SB050_4, 2012/12
Recently, 
Al compounds (
: rare earth, : transition metal) have attracted much attention due to interesting physical properties closely related to their caged-structure. Each ion is confined in a Frank-Kasper cage consisting of 16 Al atoms and the large coordination number leads to strong - hybridization. In addition, the Frank-Kasper cage allows various multipole degrees of freedom for the -electrons at low because of a highly symmetric crystalline-electric-field (CEF). Among the Al series, Pr
Al (: Ti, V) and SmAl (: Ti, V, Cr) exhibit both these features. The 
ground doublet systems PrAl (: Ti, V) show a phase transition at 
= 2.0K (Ti) and 0.6K (V). The order parameter is believed to be an electric quadrupole active in the subspace. A possibility of the quadrupole Kondo effect has been discussed based on characteristic -dependence in specific heat, resistivity, and magnetic susceptibility. The 
ground quartet systems SmAl (: Ti, V, Cr) also exhibit a phase transition at = 6.4K (Ti), 2.3K (V), and 1.8K (Cr). A nuclear specific heat study in SmTiAl suggests that the primary order parameter is a magnetic dipole in spite of field-insensitive nature of the phase boundary. A possible importance of a secondarily ordered octupole moment was discussed. We here present a microscopic study of PrTiAl and SmAl (: Ti, V, Cr) using muon spin relaxation. In PrTiAl, no additional local field was observed in the ordered phase. This strongly supports the quadrupole ordering scenario. On the other hand, an appearance of a coherent local field was observed below in SmAl. This is consistent with the primary magnetic dipole ordering. The frequency distribution suggests that the magnetic structure is possibly different between the SmAl compounds.
Nakatsuji, Satoru*; Kuga, Kentaro*; Kimura, Kenta*; Satake, Ryuta*; Katayama, Naoyuki*; Nishibori, Eiji*; Sawa, Hiroshi*; Ishii, Rieko*; Hagiwara, Masayuki*; Bridges, F.*; et al.
Science, 336(6081), p.559 - 563, 2012/05
Times Cited Count：114 Percentile：95.24(Multidisciplinary Sciences)Frustrated magnetic materials can remain disordered to the lowest temperatures. Such is the case for Ba
CuSbO
, which is magnetically anisotropic at the atomic scale but curiously isotropic on mesoscopic length and time scales. We find that the frustration on the triangular lattice is imprinted in a nanostructured honeycomb lattice of Cu
ions that resists a coherent static Jahn-Teller distortion. The resulting two-dimensional random-bond spin-1/2 system on the honeycomb lattice has a broad spectrum of spin-dimer like excitations and low-energy spin degrees of freedom that retain.
SR evidence of nonmagnetic order and Pr hyperfine-enhanced nuclear magnetism in the cubic ground doublet system PrTiAlIto, Takashi; Higemoto, Wataru; Ninomiya, Kazuhiko; Luetkens, H.*; Baines, C.*; Sakai, Akito*; Nakatsuji, Satoru*
Journal of the Physical Society of Japan, 80(11), p.113703_1 - 113703_4, 2011/11
Times Cited Count：30 Percentile：78.75(Physics, Multidisciplinary)Asami, Itsuo*; Tsuji, Takako*; Hasegawa, Toru*; Fukuta, Shiro*; Kuroyanagi, Satoru*; Hase, Yoshihiro; Yoshihara, Ryohei; Narumi, Issei
JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 68, 2011/01
no abstracts in English
Shimamoto, Susumu*; Murase, Satoru*; Nishii, Kenji*; Naito, Fuminobu*; Matsui, Kunihiro; Takahashi, Yoshikazu; Tsuji, Hiroshi
Denki Gakkai Rombunshi, B, 122(1), p.58 - 63, 2002/01
no abstracts in English
Sn conductor for ITERTakahashi, Yoshikazu; Matsui, Kunihiro; Nishii, Kenji; Koizumi, Norikiyo; Nunoya, Yoshihiko; Isono, Takaaki; Ando, Toshinari; Tsuji, Hiroshi; Murase, Satoru*; Shimamoto, Susumu*
IEEE Transactions on Applied Superconductivity, 11(1), p.1546 - 1549, 2001/03
Times Cited Count：29 Percentile：77.42(Engineering, Electrical & Electronic)no abstracts in English
Utsumi, Wataru; Funakoshi, Kenichi*; Urakawa, Satoru*; Irifune, Tetsuo*; Tamura, Kozaburo*; Inui, Masanori*; Tsuji, Kazuhiko*; Shimomura, Osamu
Hoshako, 12(1), p.17 - 23, 1999/02
no abstracts in English
Utsumi, Wataru; Funakoshi, Kenichi*; Urakawa, Satoru*; Yamakata, Masaaki*; Tsuji, Kazuhiko*; Konishi, Hiroyuki; Shimomura, Osamu
Review of High Pressure Science and Technology, 7, p.1484 - 1486, 1998/00
no abstracts in English
Sakasai, Akira; Kubo, Hirotaka; Hosogane, Nobuyuki; Sugie, Tatsuo; Higashijima, Satoru; Itami, Kiyoshi; Asakura, Nobuyuki; Koide, Yoshihiko; Shimizu, Katsuhiro; Sakurai, Shinji; et al.
IAEA-CN-60/A2/A4-P12, 0, p.95 - 103, 1995/00
no abstracts in English
Higashijima, Satoru*; Sugie, Tatsuo; Kubo, Hirotaka; Tsuji, Shunji; Shimada, Michiya; Asakura, Nobuyuki; Hosogane, Nobuyuki; Kawano, Yasunori; Nakamura, Hiroo; Itami, Kiyoshi; et al.
Journal of Nuclear Materials, 220-222, p.375 - 379, 1995/00
Times Cited Count：32 Percentile：92.83(Materials Science, Multidisciplinary)no abstracts in English
Sakasai, Akira; Kubo, Hirotaka; Hosogane, Nobuyuki; Koide, Yoshihiko; Higashijima, Satoru*; Sugie, Tatsuo; Shimizu, Katsuhiro; Shimada, Michiya; Tsuji, Shunji
Journal of Nuclear Materials, 220-222, p.405 - 409, 1995/00
Times Cited Count：12 Percentile：74.11(Materials Science, Multidisciplinary)no abstracts in English
