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Journal Articles

Al-impurity-induced magnetic excitations in heavily over-doped La$$_{1.7}$$Sr$$_{0.3}$$Cu$$_{0.95}$$Al$$_{0.05}$$O$$_{4}$$

Ikeuchi, Kazuhiko*; Nakajima, Kenji; Kawamura, Seiko; Kajimoto, Ryoichi; Wakimoto, Shuichi; Suzuki, Kensuke*; Fujita, Masaki*

AIP Advances (Internet), 8(10), p.101318_1 - 101318_5, 2018/10

 Times Cited Count:0 Percentile:100(Nanoscience & Nanotechnology)

By means of inelastic neutron scattering, we measured magnetic excitations in a sizable single crystal of La$$_{1.7}$$Sr$$_{0.3}$$Cu$$_{0.95}$$Al$$_{0.05}$$O$$_{4}$$, which is an Al-substituted system of the heavily hole-doped cuprate system La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ with an effective concentration of holes of $$X_{rm eff}$$ = 0.25.

Journal Articles

Detailed study of the structure of the low-energy magnetic excitations in overdoped La$$_{1.75}$$Sr$$_{0.25}$$CuO$$_{4}$$

Ikeuchi, Kazuhiko*; Kikuchi, Tatsuya*; Nakajima, Kenji; Kajimoto, Ryoichi; Wakimoto, Shuichi; Fujita, Masaki*

Physica B; Condensed Matter, 536, p.717 - 719, 2018/05

 Times Cited Count:1 Percentile:86.6(Physics, Condensed Matter)

To examine the detailed structure of low-energy magnetic excitations in a high-transition-temperature superconducting cuprate with heavily hole-doping, we performed inelastic neutron scattering experiments on La$$_{1.75}$$Sr$$_{0.25}$$CuO$$_{4}$$. We observed clear dispersion relations of the previously reported incommensurate (IC) magnetic correlations at $$Q_{rm tet}$$ = (0.5 $$pm$$ $$delta$$, 0.5)/(0.5, 0.5 $$pm$$ $$delta$$). In addition, we show the emergence of continuum magnetic excitations with a ring shape centered at $$Gamma$$ point $$Q_{rm tet}=(0.5, 0.5)$$ in a constant energy spectrum at $$T$$ = 50 K. The radius of the ring ($$r$$ = 0.109) is smaller than the incommensurability ($$delta$$ = 0.118). This suggests that the origin of the ring-like excitations is different from that of the IC magnetic correlations, and the low-energy magnetic excitations of the La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ system are inherently composed of these two kinds of excitations.

Journal Articles

Quantitative characterization of the nanoscale local lattice strain induced by Sr dopants in La$$_{1.92}$$Sr$$_{0.08}$$CuO$$_{4}$$

Lin, J. Q.*; Liu, X.*; Blackburn, E.*; Wakimoto, Shuichi; Ding, H.*; Islam, Z.*; Sinha, S. K.*

Physical Review Letters, 120(19), p.197001_1 - 197001_6, 2018/05

 Times Cited Count:0 Percentile:100(Physics, Multidisciplinary)

The nanometer scale lattice deformation brought about by the dopants in the high temperature superconducting cuprate La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ $$(x=0.08)$$ was investigated by measuring the associated X-ray diffuse scattering around multiple Bragg peaks. Our results address the long-term concern of dopant introduced local lattice inhomogeneity, and show that the associated nanometer scale lattice deformation is marginal and cannot be responsible for the patched variation in the spectral gaps observed with scanning tunneling microscopy in the cuprates.

Journal Articles

Fe-impurity-induced magnetic excitations in heavily over-doped La$$_{1.7}$$Sr$$_{0.3}$$Cu$$_{0.95}$$Fe$$_{0.05}$$O$$_{4}$$

Ikeuchi, Kazuhiko*; Kikuchi, Tatsuya*; Nakajima, Kenji; Kajimoto, Ryoichi; Wakimoto, Shuichi; Fujita, Masaki*

Journal of Physics; Conference Series, 969(1), p.012024_1 - 012024_5, 2018/04

 Times Cited Count:1 Percentile:23.99

Journal Articles

Current status of research and development at Japan Atomic Energy Agency

Oigawa, Hiroyuki; Wakimoto, Shuichi

Denki Hyoron, 103(2), p.50 - 65, 2018/02

no abstracts in English

Journal Articles

Observation of momentum-dependent charge excitations in hole-doped cuprates using resonant inelastic X-ray scattering at the oxygen $$K$$ edge

Ishii, Kenji*; Toyama, Takami*; Asano, Shun*; Sato, Kentaro*; Fujita, Masaki*; Wakimoto, Shuichi; Tsutsui, Kenji*; Sota, Shigetoshi*; Miyawaki, Jun*; Niwa, Hideharu*; et al.

Physical Review B, 96(11), p.115148_1 - 115148_8, 2017/09

AA2017-0402.pdf:0.81MB

 Times Cited Count:14 Percentile:22.22(Materials Science, Multidisciplinary)

Journal Articles

Scaling of memories and crossover in glassy magnets

Samarakoon, A. M.*; Takahashi, Mitsuru*; Zhang, D.*; Yang, J.*; Katayama, Naoyuki*; Sinclair, R.*; Zhou, H. D.*; Diallo, S. O.*; Ehlers, G.*; Tennant, D. A.*; et al.

Scientific Reports (Internet), 7(1), p.12053_1 - 12053_8, 2017/09

AA2017-0448.pdf:3.45MB

 Times Cited Count:3 Percentile:55.48(Multidisciplinary Sciences)

Journal Articles

Observation of magnetoelastic effects in a quasi-one-dimensional spiral magnet

Wang, C.*; Daiwei, Y.*; Liu, X.*; Chen, R.*; Du, X.*; Hu, B.*; Wang, L.*; Iida, Kazuki*; Kamazawa, Kazuya*; Wakimoto, Shuichi; et al.

Physical Review B, 96(8), p.085111_1 - 085111_5, 2017/08

AA2017-0274.pdf:1.02MB

 Times Cited Count:3 Percentile:69.64(Materials Science, Multidisciplinary)

Journal Articles

Current status of research and development at Japan Atomic Energy Agency

Oigawa, Hiroyuki; Wakimoto, Shuichi

Denki Hyoron, 102(2), p.46 - 61, 2017/02

no abstracts in English

JAEA Reports

Proceedings of the Joint Workshop for the JAEA Project Researches "Structure and Electronic Properties of Functional Materials" and "Study of Spin and Lattice Dynamics in Cuprate Superconductors"

Kajimoto, Ryoichi; Nakajima, Kenji; Wakimoto, Shuichi

JAEA-Review 2016-018, 84 Pages, 2016/08

JAEA-Review-2016-018.pdf:20.69MB

The Materials and Life Science Division in J-PARC Center has been conducting "JAEA Project Researches", which consists of a several research projects utilizing neutron scattering instruments developed by JAEA in the Materials and Life Science Experimental Facility. Among the research projects, the project "Structure and electronic properties of functional materials" has been conducted in 2012-2014, and the project "the study of spin-lattice dynamics in superconductors" has started since 2015. On March 22-23, 2016, a joint workshop for these two projects was held at the Institute for Materials Research, Tohoku University. This report compiles the presentation materials and abstracts shown in the above-mentioned workshop.

Journal Articles

Neutron scattering study of spin fluctuations in La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ by four-dimensional mapping of neutron cross-sections using the 4SEASONS chopper spectrometer

Wakimoto, Shuichi; Ikeuchi, Kazuhiko*; Arai, Masatoshi; Fujita, Masaki*; Kajimoto, Ryoichi; Kawamura, Sho*; Matsuura, Masato*; Nakajima, Kenji; Yamada, Kazuyoshi*

JPS Conference Proceedings (Internet), 8, p.034013_1 - 034013_6, 2015/09

Journal Articles

High-energy magnetic excitations in overdoped La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ studied by neutron and resonant inelastic X-ray scattering

Wakimoto, Shuichi; Ishii, Kenji; Kimura, Hiroyuki*; Fujita, Masaki*; Dellea, G.*; Kummer, K.*; Braicovich, L.*; Ghiringhelli, G.*; Debeer-Schmitt, L. M.*; Granroth, G.*

Physical Review B, 91(18), p.184513_1 - 184513_7, 2015/05

 Times Cited Count:16 Percentile:29.95(Materials Science, Multidisciplinary)

Journal Articles

Influence of electron doping on magnetic order in CeRu$$_2$$Al$$_{10}$$

Kobayashi, Riki*; Kaneko, Koji; Saito, Kotaro*; Mignot, J.-M.*; Andr$'e$, G.*; Robert, J.*; Wakimoto, Shuichi; Matsuda, Masaaki*; Chi, S.*; Haga, Yoshinori; et al.

Journal of the Physical Society of Japan, 83(10), p.104707_1 - 104707_5, 2014/10

 Times Cited Count:13 Percentile:28.67(Physics, Multidisciplinary)

Journal Articles

Anisotropic magnetic form factor in a detwinned single crystal of BaFe$$_2$$As$$_2$$

Kodama, Katsuaki; Ishikado, Motoyuki*; Wakimoto, Shuichi; Kiho, Kunihiro*; Lee, C.-H.*; Iyo, Akira*; Eisaki, Hiroshi*; Shamoto, Shinichi

Physical Review B, 90(14), p.144510_1 - 144510_5, 2014/10

 Times Cited Count:1 Percentile:93.63(Materials Science, Multidisciplinary)

Journal Articles

Anharmonic Pr guest modes in Pr(Os$$_{1-x}$$Ru$$_x$$)$$_4$$Sb$$_{12}$$ investigated by inelastic X-ray scattering

Tsutsui, Satoshi; Kaneko, Koji; Miyazaki, Ryoichi*; Higashinaka, Ryuji*; Aoki, Yuji*; Kobayashi, Riki*; Wakimoto, Shuichi; Baron, A. Q. R.*; Sugawara, Hitoshi*; Sato, Hideyuki*

JPS Conference Proceedings (Internet), 3, p.011060_1 - 011060_5, 2014/06

Journal Articles

Role of magnetic chirality in polarization flip upon a commensurate-incommensurate magnetic phase transition in YMn$$_{2}$$O$$_{5}$$

Wakimoto, Shuichi; Kimura, Hiroyuki*; Sakamoto, Yuma*; Fukunaga, Mamoru*; Noda, Yukio*; Takeda, Masayasu; Kakurai, Kazuhisa

Physical Review B, 88(14), p.140403_1 - 140403_5, 2013/10

 Times Cited Count:17 Percentile:32.64(Materials Science, Multidisciplinary)

Journal Articles

Polarized neutron scattering using triple axis spectrometers

Wakimoto, Shuichi

Hamon, 23(3), p.230 - 237, 2013/08

Neutron scattering cross-section by matter includes nuclear scattering and magnetic scattering. By using polarized neutrons, one can distinguish these two components and can obtain information of magnetic moment and spin arrangements. In addition, one can get details of complicated magnetic structure, such as a helical spin structure. In this article, neutron scattering techniques using triple axis spectrometers are reviewed.

Journal Articles

Powder neutron diffraction study of HoCoGa$$_{5}$$

Kobayashi, Riki; Kaneko, Koji; Wakimoto, Shuichi; Chi, S.*; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*

Journal of the Korean Physical Society, 63(3), p.337 - 340, 2013/08

 Times Cited Count:3 Percentile:67.89(Physics, Multidisciplinary)

Journal Articles

Resonant inelastic X-ray scattering study of intraband charge excitations in hole-doped high-$$T_c$$ cuprates

Wakimoto, Shuichi; Ishii, Kenji; Kimura, Hiroyuki*; Ikeuchi, Kazuhiko*; Yoshida, Masahiro*; Adachi, Tadashi*; Casa, D.*; Fujita, Masaki*; Fukunaga, Yasushi*; Gog, T.*; et al.

Physical Review B, 87(10), p.104511_1 - 104511_7, 2013/03

 Times Cited Count:7 Percentile:59.5(Materials Science, Multidisciplinary)

Journal Articles

Magnetoelectric effect driven by magnetic domain modification in LuFe$$_{2}$$O$$_{4}$$

Kambe, Takashi*; Fukada, Yukimasa*; Kano, Jun*; Nagata, Tomoko*; Okazaki, Hiroyuki*; Yokoya, Takayoshi*; Wakimoto, Shuichi; Kakurai, Kazuhisa; Ikeda, Naoshi*

Physical Review Letters, 110(11), p.117602_1 - 117602_5, 2013/03

 Times Cited Count:21 Percentile:22.74(Physics, Multidisciplinary)

207 (Records 1-20 displayed on this page)