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Takagi, Hirotaka*; Takagi, Rina*; Minami, Susumu*; Nomoto, Takuya*; Oishi, Kazuki*; Suzuki, Michito*; Yanagi, Yuki*; Hirayama, Motoaki*; Khanh, N.*; Karube, Kosuke*; et al.
Nature Physics, 19(7), p.961 - 968, 2023/07
Times Cited Count：8 Percentile：96.03(Physics, Multidisciplinary)
-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.
(An=U, Np, Pu, Am, and Cm)Suzuki, Michito; Magnani, N.*; Oppeneer, P.*
Physical Review B, 88(19), p.195146_1 - 195146_14, 2013/11
Times Cited Count：48 Percentile：85.77(Materials Science, Multidisciplinary)Recently, f electron materials containing actinide elements have drawn considerable interest, stimulated by observations of intriguingly ordered ground states forming at low temperatures. In this study, we performed a systematic analysis of the electronic ground states of actinide dioxides AnO (An=U, Np, Pu, Am, and Cm) on the basis of a state-of-art first-principles method developed by the authors. The calculations provide intuitive connections between the electronic structures and the local crystalline fields working on the 5 states in the AnO series. Particularly the mechanisms leading to the experimentally observed insulating ground states are investigated. These are found to arise from the strong spin-orbit and Coulomb interactions of the 5 orbitals. However, as a result of the different 5 configurations, these interactions work in distinctly different ways for each of the AnO compounds.
AlCKoyama, Takehide*; Ozaki, Yuzuru*; Ueda, Koichi*; Mito, Takeshi*; Kohara, Takao*; Waki, Takeshi*; Tabata, Yoshikazu*; Michioka, Chishiro*; Yoshimura, Kazuyoshi*; Suzuki, Michito; et al.
Journal of the Physical Society of Japan, 81(Suppl.B), p.SB008_1 - SB008_5, 2012/12
Times Cited Count：1 Percentile：10.8(Physics, Multidisciplinary)The normal state properties of a noncentrosymmetric superconductor MoAlC are studied by means of the nuclear magnetic resonance (NMR) experiment. The change of NMR line shape and the peak of the nuclear spin-echo decay rate at 
130 K indicate that the MoAlC exhibits the phase transition prior to the emergence of superconductivity. The reduction in the conduction electron density is inferred from the decrease in the nuclear spin-lattice relaxation rate. The nature of the newly found phase transition is discussed by considering the result of the first principle calculations, indicating a good nesting property of the Fermi surfaces.
Si with an itinerant electron pictureIkeda, Hiroaki*; Suzuki, Michito
Kotai Butsuri, 47(11), p.693 - 706, 2012/11
no abstracts in English
SiIkeda, Hiroaki*; Suzuki, Michito; Arita, Ryotaro*; Takimoto, Tetsuya*; Shibauchi, Takasada*; Matsuda, Yuji*
Nature Physics, 8(7), p.528 - 533, 2012/07
Times Cited Count：132 Percentile：96.1(Physics, Multidisciplinary)The origin of the hidden-order phase transition of URuSi has been a long-standing mystery in condensed matter physics. We examine the complete set of multipole correlations allowed in URuSi based on a first-principles theoretical approach. The results uncover that the hidden-order parameter is a rank-5 multipole (dotriacontapole) order with nematic 
symmetry. This naturally provides comprehensive explanations of all key features in the hidden-order phase including anisotropic magnetic excitations, nearly degenerate antiferromagnetic-ordered state, and spontaneous rotational symmetry breaking.
AlCKoyama, Takehide*; Ozaki, Yuzuru*; Ueda, Koichi*; Mito, Takeshi*; Kohara, Takao*; Waki, Tsuyoshi*; Tabata, Yoshikazu*; Michioka, Chishiro*; Yoshimura, Kazuyoshi*; Suzuki, Michito; et al.
Physical Review B, 84(21), p.212501_1 - 212501_4, 2011/12
Times Cited Count：12 Percentile：44.66(Materials Science, Multidisciplinary)The results of 
Al nuclear magnetic resonance and specific-heat measurements of the noncentrosymmetric superconductor MoAlC are reported. The phase transition around 130 K is inferred from a distinct change in the NMR spectrum, a clear peak in the spin-echo decay rate, and an anomaly in the specific heat. Possibility of charge-density wave ordering around 130 K is discussed by calculating the Fermi surfaces in the normal states and considering the partial quenching of the Fermi surfaces with the decrease in 1/
below the superconducting transition temperature.
Ijiri, Yuji*; Suzuki, Shunichi*; Sugihara, Yutaka*; Shimo, Michito*; Yamamoto, Hajime*; *
JNC TJ7400 2002-003, 525 Pages, 2002/03
JNC-TJ7400-2002-003.pdf:15.78MB
no abstracts in English
Ijiri, Yuji*; Suzuki, Shunichi*; Oishi, Masaya*; Sugihara, Yutaka*; Shimo, Michito*; *; *
JNC TJ7400 2001-007, 612 Pages, 2001/03
JNC-TJ7400-2001-007.pdf:118.17MB
no abstracts in English
SiSuzuki, Michito
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Suzuki, Michito
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SiSuzuki, Michito
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Suzuki, Michito
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SiSuzuki, Michito
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Suzuki, Michito
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Suzuki, Michito
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character in -US, a Mott insulator with a narrow 
- hybridization gapMetoki, Naoto; Sakai, Hironori; Suzuki, Michito; Yamamoto, Etsuji; Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo*
no journal, ,
It is revealed that the localized 5
state is stable at low temperature in US from the observation of crystal-field excitation. The crystal field excitation is strongly dumped and a magnetic quasi-elastic scattering is observed with decrease of the electrical resistivity in the order of 10
above 100 K. This is understood with the crossover of 5 electrons from the localized to the itinerant character. The band calculation by Suzuki 
. reported that US is a Mott insulator with a small - hybridization gap in the vicinity of the 
point. Therefore the crossover of 5 character is considered to be due to the hybridization effect, although the presence of the impurity level can not be ruled out experimentally.
-USSuzuki, Michito; Metoki, Naoto; Sakai, Hironori; Haga, Yoshinori
no journal, ,
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-US, a Mott insulator with a narrow - hybridization gapMetoki, Naoto; Sakai, Hironori; Suzuki, Michito; Yamamoto, Etsuji; Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo*
no journal, ,
Our neutron scattering study revealed the crossover of the 5 character in -US. This compound is a Mott insulator with a small - hybridization gap at point. The hybridization effect with a peculiar band dispersion nearly Dirac fermion would be the origin of the crossover of 5 character.
