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Journal Articles

Magnetic structure of divalent europium compound EuGa$$_{4}$$ studied by single-crystal time-of-flight neutron diffraction

Kawasaki, Takuro; Kaneko, Koji; Nakamura, Ai*; Aso, Naofumi*; Hedo, Masato*; Nakama, Takao*; Ohara, Takashi; Kiyanagi, Ryoji; Oikawa, Kenichi; Tamura, Itaru; et al.

Journal of the Physical Society of Japan, 85(11), p.114711_1 - 114711_5, 2016/11

 Times Cited Count:5 Percentile:47.01(Physics, Multidisciplinary)

Journal Articles

Single crystal neutron diffraction study of high neutron absorbing compound EuGa$$_{4}$$

Kawasaki, Takuro; Kaneko, Koji; Aso, Naofumi*; Nakamura, Ai*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*; Ohara, Takashi; Kiyanagi, Ryoji; Oikawa, Kenichi; et al.

JPS Conference Proceedings (Internet), 1, p.014009_1 - 014009_4, 2014/03

Journal Articles

Uniaxial-pressure control of magnetic phase transitions in a frustrated magnet CuFe$$_{1-x}$$Ga$$_{x}$$O$$_{2}$$ (x =0, 0.018)

Nakajima, Taro*; Mitsuda, Setsuo*; Takahashi, Keiichiro*; Yoshitomi, Keisuke*; Masuda, Kazuya*; Kaneko, Chikafumi*; Homma, Yuki*; Kobayashi, Satoru*; Kitazawa, Hideaki*; Kosaka, Masashi*; et al.

Journal of the Physical Society of Japan, 81(9), p.094710_1 - 094710_8, 2012/09

Journal Articles

Uniaxial-pressure control of magnetic phase transitions in a frustrated magnet CuFe$$_{1-x}$$Ga$$_{x}$$O$$_{2}$$ ($$x$$ = 0, 0.018)

Nakajima, Taro*; Mitsuda, Setsuo*; Takahashi, Keiichiro*; Yoshitomi, Keisuke*; Masuda, Kazuya*; Kaneko, Chikafumi*; Homma, Yuki*; Kobayashi, Satoru*; Kitazawa, Hideaki*; Kosaka, Masashi*; et al.

Journal of the Physical Society of Japan, 81(9), p.094710_1 - 094710_8, 2012/09

 Times Cited Count:12 Percentile:62.78(Physics, Multidisciplinary)

Journal Articles

Fractal dimension in percolating Heisenberg antiferromagnets

Ito, Shinichi*; Kajimoto, Ryoichi; Adams, M. A.*; Bull, M. J.*; Iwasa, Kazuaki*; Aso, Naofumi*; Yoshizawa, Hideki*; Takeuchi, Tetsuya*

Journal of Magnetism and Magnetic Materials, 310(2, Part2), p.1549 - 1551, 2007/03

We investigated static and dynamical properties in the three-dimensional percolating Heisenberg antiferromagnets, RbMn$$_c$$Mg$$_{1-c}$$F$$_3$$, with the magnetic concentration close to the percolation threshold, $$c_P = 0.312$$, around the superlattice point well below $$T_N$$. In neutron diffraction experiment, the wave number dependence of the elastic scattering component was well fitted to $$q^{-x}$$. Magnetic fractons were also studied using inelastic neutron scattering, and the observed fractons showed the dispersion relation of $$q^z$$. The determined exponents, $$x = 2.43 pm 0.05$$ and $$z = 2.5 pm 0.1$$, were in good agreement with the fractal dimension ($$D_f = 2.48$$).

Journal Articles

Single crystal synchrotron X-ray diffraction study under pressure in UGe$$_{2}$$

Aso, Naofumi*; Owada, Kenji; Watanuki, Tetsu; Machida, Akihiko; Omura, Ayako; Inami, Toshiya; Homma, Yoshiya*; Shiokawa, Yoshinobu*; Hirota, Kazuma*; Sato, Noriaki*

Journal of the Physical Society of Japan, 75(Suppl.), p.88 - 90, 2006/08

no abstracts in English

Journal Articles

Magnetization dynamics in the normal and superconducting phases of UPd$$_2$$Al$$_3$$, 1; Surveys in reciprocal space using neutron inelastic scattering

Hiess, A.*; Bernhoeft, N.*; Metoki, Naoto; Lander, G.*; Roessli, B.*; Sato, Noriaki*; Aso, Naofumi*; Haga, Yoshinori; Koike, Yoshihiro*; Komatsubara, Takemi*; et al.

Journal of Physics; Condensed Matter, 18(27), p.R437 - R451, 2006/07

This topical review presents results from neutron inelastic scattering experiments on single crystals of UPd$$_2$$Al$$_3$$. We present a detailed and complete characterization of the wave vector- and energy-dependent magnetization dynamics in UPd$$_2$$Al$$_3$$ as measured by neutron inelastic scattering primarily in the form of extensive surveys in energy-momentum space under a wide range of experimental conditions, and put our observations in context with data that has been published previously by two independent groups. This study yields unique insight into the low-temperature ground state, which exhibits a microscopic coexistence of antiferromagnetism and superconductivity, makingUPd$$_2$$Al$$_3$$ one of the most accessible heavy-fermion superconductors that can be fully characterized by neutron spectroscopy.

Journal Articles

Neutron scattering investigation on quantum spin system SrCu$$_{2}$$(BO$$_{3}$$)$$_{2}$$

Kakurai, Kazuhisa; Nukui, Katsuyuki*; Aso, Naofumi*; Nishi, Masakazu*; Kadowaki, Hiroaki*; Kageyama, Hiroshi*; Ueda, Yutaka*; Regnault, L.-P.*; C$'e$pas, O.*

Progress of Theoretical Physics Supplement, (159), p.22 - 32, 2005/10

no abstracts in English

Journal Articles

High energy-resolution inelastic neutron scattering experiments on triplet bound state excitations in SrCu$$_{2}$$(BO$$_{3}$$)$$_{2}$$

Aso, Naofumi*; Kageyama, Hiroshi*; Nukui, Katsuyuki*; Nishi, Masakazu*; Kadowaki, Hiroaki*; Ueda, Yutaka*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 74(8), p.2189 - 2192, 2005/08

 Times Cited Count:7 Percentile:46.33(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Phonon anomaly on Na$$_x$$HfNCl superconductors with ${it T}$$$_c$$=22 K

Shamoto, Shinichi; Hirai, Atsuo*; Yamanaka, Shoji*; Aso, Naofumi*; Kajitani, Tsuyoshi*

Journal of Neutron Research, 12(4), p.295 - 300, 2004/12

Inelastic neutron scattering measurements have been performed on superconducting Na$$_x$$HfNCl powder samples with x=0.27 and 0.38 (T$$_c$$ =22 K). We have observed several temperature dependent phonon anomalies, e.g., at E=15, 29, 76, and 81 meV for the former sample. A phonon peak with E=14.5 meV at Q=6 $AA $^{-1}$$ increases for both samples with decreasing temperature below T=40 K, which is much higher than T$$_c$$. The phonon peak is assigned to an ab-plane vibrational mode, E$$_u$$, of chlorine and hafnium atoms, which strongly modifies the electronic band structure. The phonon anomaly is discussed in terms of carrier inhomogeneity.

Journal Articles

Higher-order collinear interaction and magnetic excitation in the 5f localized system U$$_{3}$$Pd$$_{20}$$Si$$_{6}$$

Metoki, Naoto; Koike, Yoshihiro; Haga, Yoshinori; Kaneko, Koji; Araki, Shingo; McEwen, K. A.*; Kogi, Masafumi*; Aso, Naofumi*; Lander, G. H.; Komatsubara, Takemi*; et al.

Journal of Physics; Condensed Matter, 15(28), p.S1957 - S1963, 2003/07

 Times Cited Count:2 Percentile:15.73(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Magnetic structure, phase diagram, and a new type of spin-flop transition dominated by higher order interaction in a localized 5$$f$$ system U$$_{3}$$Pd$$_{20}$$Si$$_{6}$$

Koike, Yoshihiro; Metoki, Naoto; Haga, Yoshinori; McEwen, K. A.*; Kogi, Masafumi*; Yamamoto, Ryunosuke*; Aso, Naofumi*; Tateiwa, Naoyuki*; Komatsubara, Takemi*; Kimura, Noriaki*; et al.

Physical Review Letters, 89(7), p.077202_1 - 077202_4, 2002/08

 Times Cited Count:7 Percentile:48.12(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Dzyaloshinski-Moriya interaction in the 2D spin gas system SrCu$$_{2}$$(BO$$_{3}$$)$$_{2}$$

C$'e$pas, O.*; Kakurai, Kazuhisa; Regnault, L. P.*; Ziman, T.*; Boucher, J. P.*; Aso, Naofumi*; Nishi, Masakazu*; Kageyama, Hiroshi*; Ueda, Yutaka*

Physical Review Letters, 87(16), p.167205_1 - 167205_4, 2001/10

 Times Cited Count:100 Percentile:92.6(Physics, Multidisciplinary)

no abstracts in English

Oral presentation

Low energy magnetic excitation in TbMnO$$_3$$

Kajimoto, Ryoichi; Mitsui, Yukari*; Yoshizawa, Hideki*; Aso, Naofumi*; Shintani, Hiroshi*; Kimura, Tsuyoshi*; Tokura, Yoshinori*

no journal, , 

no abstracts in English

Oral presentation

Magnetic structure analysis of high neutron absorbing compound EuGa$$_{4}$$

Kawasaki, Takuro; Kaneko, Koji; Aso, Naofumi*; Nakamura, Ai*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*; Ohara, Takashi; Kiyanagi, Ryoji; Oikawa, Kenichi; et al.

no journal, , 

no abstracts in English

Oral presentation

New neutron scattering results on the spin dynamics in UNi$$_2$$Al$$_3$$ and UPd$$_2$$Al$$_3$$

Scheneidewind, A.*; Hiess, A.*; Stockert, O.*; Aso, Naofumi*; Sato, Noriaki*; Raymond, S.*; Kaneko, Koji; Blackburn, E.*; Steffens, P.*; Lander, G. H.*

no journal, , 

Oral presentation

Single crystal neutron diffraction study of high neutron absorbing compound EuX$$_{4}$$ (X = Al, Ga)

Kawasaki, Takuro; Kaneko, Koji; Aso, Naofumi*; Nakamura, Ai*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*; Moyoshi, Taketo*; Nakao, Akiko*; Hanashima, Takayasu*; et al.

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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