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Journal Articles

Quantum critical behavior of the hyperkagome magnet Mn$$_3$$CoSi

Yamauchi, Hiroki; Sari, D. P.*; Yasui, Yukio*; Sakakura, Terutoshi*; Kimura, Hiroyuki*; Nakao, Akiko*; Ohara, Takashi; Honda, Takashi*; Kodama, Katsuaki; Igawa, Naoki; et al.

Physical Review Research (Internet), 6(1), p.013144_1 - 013144_9, 2024/02

Journal Articles

Experimental analysis on dynamics of liquid molecules adjacent to particles in nanofluids

Hashimoto, Shunsuke*; Nakajima, Kenji; Kikuchi, Tatsuya*; Kamazawa, Kazuya*; Shibata, Kaoru; Yamada, Takeshi*

Journal of Molecular Liquids, 342, p.117580_1 - 117580_8, 2021/11

 Times Cited Count:3 Percentile:18.93(Chemistry, Physical)

Quasi-elastic neutron scattering (QENS) and pulsed-field-gradient nuclear magnetic resonance (PFGNMR) analyses of a nanofluid composed of silicon dioxide (SiO$$_{2}$$) nanoparticles and a base fluid of ethylene glycol aqueous solution were performed. The aim was to elucidate the mechanism increase in the thermal conductivity of the nanofluid above its theoretical value. The obtained experimental results indicate that SiO$$_{2}$$ particles may decrease the self-diffusion coefficient of the liquid molecules in the ethylene glycol aqueous solution because of their highly restricted motion around these nanoparticles. At a constant temperature, the thermal conductivity increases as the self-diffusion coefficient of the liquid molecules decreases in the SiO$$_{2}$$ nanofluids.

Journal Articles

Magnetic scattering in the simultaneous measurement of small-angle neutron scattering and Bragg edge transmission from steel

Oba, Yojiro*; Morooka, Satoshi; Oishi, Kazuki*; Sato, Nobuhiro*; Inoue, Rintaro*; Adachi, Nozomu*; Suzuki, Junichi*; Tsuchiyama, Toshihiro*; Gilbert, E. P.*; Sugiyama, Masaaki*

Journal of Applied Crystallography, 49(5), p.1659 - 1664, 2016/10

 Times Cited Count:13 Percentile:64.40(Chemistry, Multidisciplinary)

Journal Articles

A-Type antiferromagnetic ordering and the transition of the 5$$f$$ electronic state accompanied by unusual moment reorientation in NpRhGa$$_5$$

Jonen, Shintaro; Metoki, Naoto; Honda, Fuminori; Kaneko, Koji; Yamamoto, Etsuji; Haga, Yoshinori; Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu; Onuki, Yoshichika

Journal of the Physical Society of Japan, 75(Suppl.), p.41 - 43, 2006/08

Elastic neutron scattering experiments have been carried out in order to reveal the magnetic structure and 5f electronic state of NpRhGa$$_5$$. This material exhibits two successive antiferromagnetic transition at T$$_{N1}$$ = 36 K and T$$_{N2}$$ = 33 K, respectively. A-type antiferromagnetic structure with the propagation vector q = (0 0 1/2) has been revealed below T$$_{N1}$$. We found a remarkable change in the moment direction, namely the Np moment is parallel and perpendicular to the c-axis for T$$_{N2}$$ $$<$$ T $$<$$ T$$_{N1}$$ and T $$<$$ T$$_{N2}$$, respectively. The magnetic moment exhibits a remarkable jump at T$$_{N2}$$, indicating that the moment reorientation is associated with the change of 5f electronic state. The observed magnetic form factor indicates the dominant contribution of the orbital moment and revealed an itinerant character of the 5f electrons.

Journal Articles

Resonant magnetic X-ray scattering study of UPd$$_2$$Al$$_3$$

Ishii, Kenji; Kuzushita, Kaori; Murakami, Yoichi; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika

Journal of the Physical Society of Japan, 75(Suppl.), p.102 - 104, 2006/08

UPd$$_2$$Al$$_3$$ is an attractive material because of the coexistence of the antiferromagnetic order below $$T_N$$ = 14.5 K and superconductivity below $$T_c$$ = 2 K. In order to discuss the coupling between magnetism and superconductivity by resonant magnetic X-ray scattering (RMXS), nature of the resonance at each absorption edge should be clarified before the measurements across $$T_c$$. Therefore we performed RMXS study from U $$M_1$$ to $$M_4$$ edge at $$T_c < T < T_N$$. In addition to a huge resonance at $$M_4$$-edge, we observed a resonant feature at $$M_2$$-edge which corresponds to the transition from $$3p_{1/2}$$ to $$6d$$ orbitals, while resonance at $$M_1$$-edge and $$M_3$$-edge is rather small.

Journal Articles

$$R$$-dependence of spin exchange interactions in $$R$$MnO$$_{3}$$ ($$R$$ = Rare-Earth Ions)

Kajimoto, Ryoichi; Mochizuki, Hidenori*; Yoshizawa, Hideki*; Shintani, Hiroshi*; Kimura, Tsuyoshi*; Tokura, Yoshinori*

Journal of the Physical Society of Japan, 74(9), p.2430 - 2433, 2005/09

 Times Cited Count:38 Percentile:79.67(Physics, Multidisciplinary)

Magnon excitations have been investigated for PrMnO$$_{3}$$ showing the $textit{A}$-type antiferromagnetic ordering and TbMnO$$_{3}$$ forming a long-period spin ordering by inelastic neutron scattering. Combined with a result of LaMnO$$_{3}$$ [K.~Hirota $textit{et al.}$], the systematic data revealed that the ferromagnetic exchange interaction between nearest-neighbor (NN) Mn sites within the $$ab$$ plane drastically decreases in $$R$$MnO$$_{3}$$ as the ionic radius of $$R$$ is reduced. In addition, finite next-nearest-neighbor (NNN) coupling is evident in TbMnO$$_{3}$$. In contrast, the exchange interaction along the $$c$$ axis shows much weaker $$R$$ dependence consistent with the Mn-O-Mn bond angle. These observations confirm a scenario that explains the evolution of spin structures in $$R$$MnO$$_{3}$$ in terms of the competition between the NN and NNN interactions [T.Kimura $textit{et al.}$].

Journal Articles

Neutron scattering study on 5f itinerant antiferromagnet UPdGa$$_5$$

Ikeda, Shugo; Metoki, Naoto; Haga, Yoshinori; Kaneko, Koji; Matsuda, Tatsuma; Onuki, Yoshichika

Physica B; Condensed Matter, 359-361, p.1030 - 1032, 2005/06

 Times Cited Count:1 Percentile:5.91(Physics, Condensed Matter)

We have succeeded to grow a single crystal of uranium ternary intermetallic compound UPdGa$$_5$$ by the Ga self-flux method. The magnetic susceptibility showed a weak temperature dependence and small anisotropy,consistent with an itinerant character of 5$$f$$ electrons. We observed a clear drop in the susceptibility and electrical resistivity below the Neel temperature $$T_N$$= 31 K. The magnetic structure was studied by means of a neutron diffraction measurement. We observed an antiferromagnetic peak with the propagation vector $$Q$$=[0,0,1/2]. The uranium 5$$f$$ moment of 0.33$$mu$$$$_{B}$$ parallel to the $$c$$-axis was found to order ferromagnetically in the basal $$c$$-plane and coupled antiferromagnetically along the $$c$$-axis.

Journal Articles

High-energy resolution inelastic neutron scattering experiment on magnetic fracton dispersion in near-percolating three-dimensional Heisenberg antiferromagnet, RbMn$$_{0,4}$$Mg$$_{0.6}$$F$$_{3}$$

Ito, Shinichi*; Kajimoto, Ryoichi; Adams, M. A.*

Journal of the Physical Society of Japan, 74(1), p.279 - 282, 2005/01

 Times Cited Count:3 Percentile:26.36(Physics, Multidisciplinary)

Magnetic fractons in the near-percolating three-dimensional (3D) Heisenberg antiferromagnet, RbMn$$_{0.4}$$Mg$$_{0.6}$$F$$_{3}$$, have been studied using inelastic neutron scattering with high energy resolution ($$Delta E=17.5 mu$$eV) and at low temperature ($$T=1.5$$ K). It is demonstrated that the fractons follow the dispersion relation of $$q^z$$ (q being the wave number). The observed exponent, $$z=2.5$$, is in good agreement with the fractal dimension of the 3D system ($$D_f=2.48$$), as predicted by theory.

Journal Articles

Magnetic structure of CoO studied by neutron and synchrotron X-ray diffraction

Tomiyasu, Keisuke*; Inami, Toshiya; Ikeda, Naoshi*

Physical Review B, 70(11), p.184411_1 - 184411_6, 2004/11

 Times Cited Count:46 Percentile:83.95(Materials Science, Multidisciplinary)

Below $$T$$$$_{N}$$ = 289 K, the antiferromagnet CoO exhibits magnetic long-range order described by a propagation vector along the trigonal axis, whereas the lattice is distorted monoclinicly along both the tetragonal and the trigonal axes. In order to elucidate this inconsistency, we performed neutron and synchrotron X-ray diffraction experiments on single crystals of CoO, and found a new series of magnetic reflections represented by a propagation vector along the tetragonal axis below $$T$$$$_{N}$$N. These results suggest an altered magnetic structure of CoO, which includes both the trigonal and the tetragonal propagation vectors, has a monoclinic symmetry and which is in accordance with the distorted lattice symmetry.

Journal Articles

Phonon density of states in Sr$$_{2}$$FeCoO$$_{6-delta}$$ and SrBaFeCoO$$_{6-delta}$$; Effects induced by magnetic order and transport coherence

Rykov, A. I.*; Nomura, Kiyoshi*; Sawada, Tsuguo*; Mitsui, Takaya; Seto, Makoto*; Tamegai, Tsuyoshi*; Tokunaga, Masashi*

Physical Review B, 68(22), p.224401_1 - 224401_7, 2003/12

 Times Cited Count:8 Percentile:42.24(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Single crystal growth and magnetic properties of 5$$f$$-itinerant antiferromagnet UPdGa$$_5$$

Ikeda, Shugo; Metoki, Naoto; Haga, Yoshinori; Kaneko, Koji; Matsuda, Tatsuma; Onuki, Yoshichika; Galatanu, A.

Journal of the Physical Society of Japan, 72(10), p.2622 - 2626, 2003/10

 Times Cited Count:16 Percentile:65.26(Physics, Multidisciplinary)

A single crystal of uranium ternary intermetallic compound UPdGa$$_5$$ was grown by the Ga self-flux method. The magnetic susceptibility showed a weak temperature dependence and small anisotropy, consistent with an itinerant character of 5$$f$$ electrons. We observed a clear drop in the susceptibility and electrical resistivity below the N$'{e}$el temperature $$T_{rm N}$$= 31 K. The magnetic structure was studied by means of a neutron diffraction measurement. We observed an antiferromagnetic peak with the propagation vector $textbf{textit{Q}}$=[0,0,1/2]. The uranium 5$$f$$ moment of 0.33$$mu_{rm B}$$/U parallel to the $$c$$-axis was found to order ferromagnetically in the basal $$c$$-plan and coupled antiferromagnetically along the $$c$$-axis.

Journal Articles

Magnetic resonant X-ray scattering in KCuF$$_{3}$$

Takahashi, Manabu*; Usuda, Manabu; Igarashi, Junichi

Physical Review B, 67(6), p.064425_1 - 064425_7, 2003/02

 Times Cited Count:21 Percentile:67.70(Materials Science, Multidisciplinary)

We study the magnetic resonant X-ray scattering (RXS) spectra around the K edge of Cu in KCuF$$_{3}$$ on the basis of an ab initio calculation. We use the full-potential linearlized augumented plane wave method in the LDA+U scheme, and introduce the lattice distortion as inputs of the calculation. We obtain finite intensity on magnetic superlattice spots by taking account of the spin-orbit interaction. We also calculate the RXS intensity on orbital superlattice spots. It is found that the intensity increases with increasing Jahn-Teller distortion.

Journal Articles

Simulation study on collisionless loss of runaway electrons by magnetic perturbations in a tokamak

Tokuda, Shinji; Yoshino, Ryuji

Nuclear Fusion, 39(9), p.1123 - 1132, 1999/09

 Times Cited Count:22 Percentile:57.16(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Neutron scattering study of the antiferromagnetic ordering in UPt$$_{3}$$ at mK-temperatures

Koike, Yoshihiro*; Metoki, Naoto; Kimura, Noriaki*; Yamamoto, Etsuji; Haga, Yoshinori; Onuki, Yoshichika*;

Physica B; Condensed Matter, 259-261, p.662 - 663, 1999/00

 Times Cited Count:3 Percentile:22.25(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Long range antiferromagnetic ordering observed below 20 mk in the heavy fermion superconductor UPt$$_{3}$$

Koike, Yoshihiro*; Metoki, Naoto; Kimura, Noriaki*; Yamamoto, Etsuji; Haga, Yoshinori; Onuki, Yoshichika*;

Journal of the Physical Society of Japan, 67(4), p.1142 - 1145, 1998/04

 Times Cited Count:24 Percentile:85.46(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Neutron scattering study of the magnetic structure of DyCu$$_{2}$$

Koike, Yoshihiro*; Metoki, Naoto; Morii, Yukio; ; Settai, Rikio*; Onuki, Yoshichika*

Journal of the Physical Society of Japan, 66(12), p.4053 - 4054, 1997/12

 Times Cited Count:5 Percentile:47.29(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Polarization analyzing system for X-ray magnetic kerr rotation in X-ray magnetic resonant scattering

Mori, K.*; Namikawa, Kazumichi*; ; ; Ando, Masami*

Review of Scientific Instruments, 64(7), p.1825 - 1830, 1993/07

 Times Cited Count:5 Percentile:52.74(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Observation of X-ray magnetic Kerr rotation at Gd L absorption edges

Mori, K.; Namikawa, Kazumichi*; Koyama, Yasuki*; Ando, Masami*

Japanese Journal of Applied Physics, 32(Suppl.32-2), p.323 - 325, 1993/00

no abstracts in English

Journal Articles

Magnetic substate population in $$^{1}$$$$^{2}$$C+$$^{1}$$$$^{2}$$C inelastic scattering

; ; ; ; ; ; ;

Phys.Lett.,B, 159(2-3), p.90 - 94, 1985/00

no abstracts in English

Journal Articles

Critical magnetic scattering of neutrons in chromium

; YORIHIKO.TSUNODA*; NOBUHIKO.KUNITOMI*

Journal of Applied Physics, 39(2), p.1227 - 1228, 1968/00

 Times Cited Count:5

no abstracts in English

Journal Articles

21 (Records 1-20 displayed on this page)