Search Results 1-20 of 50

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  • High energy magnetic excitations of two-dimensional t-t'-U Hubbard model  [in Japanese]

    Hoshina Yasutoshi , Tohyama Takami

    Meeting Abstracts of the Physical Society of Japan 73.1(0), 2111-2111, 2018

    J-STAGE 

  • Weyl Fermions in Metallic Ferromagnet SrRuO<sub>3</sub>  [in Japanese]

    Itoh Shinichi , Endoh Yasuo , Yokoo Tetsuya , Ibuka Soshi , Park Je-Geun , Kaneko Yoshio , S. Takahashi Kei , Tokura Yoshinori , Nagaosa Naoto

    … <p>Magnetic excitations in a polycrystalline sample of the metallic ferromagnet SrRuO<sub>3</sub> … were observed by neutron Brillouin scattering, i.e., inelastic neutron scattering near the forward direction, on the High Resolution Chopper Spectrometer (HRC) installed at MLF J-PARC. …

    hamon 27(2), 67-70, 2017

    J-STAGE 

  • VIII-5 Study of Dynamics on High Resolution Chopper Spectrometer  [in Japanese]

    Itoh Shinichi , Ibuka Soshi , Yokoo Tetsuya , Masuda Takatsugu , Yoshizawa Hideki , Sato Taku J.

    … <p>The High Resolution Chopper Spectrometer (HRC) is an inelastic neutron scattering instrument to study dynamics of materials in a wide energy space with high resolutions. … In high resolution experiments in a conventional energy momentum space, dynamics in numbers of strongly correlated electron systems have been revealed. …

    RADIOISOTOPES 65(12), 535-544, 2016

    J-STAGE 

  • High-energy Magnetic Excitations in Electron-doped High-<i>T</i><sub>c</sub> Cuprate  [in Japanese]

    Fujita Masaki , Ishii Kenji

    … <p>We introduce the inelastic neutron and synchrotron X-ray scattering studies on the magnetic excitation in the electron-doped copper oxide. … The recent development of state-of-the-art spectrometers at large facilities such as J-PARC enables us to study composite dynamics in the energy-momentum space arising from the interacting degrees of freedom. … High-<i>T</i><sub>c</sub> …

    hamon 25(1), 18-21, 2015

    J-STAGE 

  • High-energy spin and charge excitations in electron-doped copper oxide superconductors.

    Ishii K , Fujita M , Sasaki T , Minola M , Dellea G , Mazzoli C , Kummer K , Ghiringhelli G , Braicovich L , Tohyama T , Tsutsumi K , Sato K , Kajimoto R , Ikeuchi K , Yamada K , Yoshida M , Kurooka M , Mizuki J

    … The evolution of electronic (spin and charge) excitations upon carrier doping is an extremely important issue in superconducting layered cuprates and the knowledge of its asymmetry between electron- and hole-dopings is still fragmentary. … Here we combine X-ray and neutron inelastic scattering measurements to track the doping dependence of both spin and charge excitations in electron-doped materials. …

    Nature communications (5), 2014-04-25

    IR 

  • 27pXJ-3 Thermal variation of high- energy magnetic excitations in underdoped La_<1.925>Sr_<0.075>CuO_4 across T  [in Japanese]

    Kawamura S. , Yamada K. , Sato K. , Matsuura M. , Fujita M. , Kajimoto R. , Ji Sungdae , Nakamura M. , Inamura Y. , Arai M.

    Meeting Abstracts of the Physical Society of Japan 68.1.3(0), 655, 2013

    J-STAGE 

  • QED_<2+1> in Graphene: Symmetries of Dirac Equation in 2+1 Dimensions

    KOSINSKI Piotr , MASLANKA Pawel , SLAWINSKA Jagoda , ZASADA Ilona , Department of Theoretical Physics and Computer Science University of Lodz , Department of Theoretical Physics and Computer Science University of Lodz , Department of Theoretical Physics and Computer Science University of Lodz:Solid State Physics Department University of Lodz , Solid State Physics Department University of Lodz

    … It is well-known that the tight-binding Hamiltonian of graphene describes the low-energy excitations that appear to be massless chiral Dirac fermions. … Thus, in the continuum limit one can analyze the crystal properties using the formalism of quantum electrodynamics in 2+1 dimensions (QED_<2+1>) which provides the opportunity to verify the high energy physics phenomena in the condensed matter system. …

    Progress of theoretical physics 128(4), 727-739, 2012-10-25

    References (25)

  • Decisive Role of Neutron Scattering on Research for Low Dimensional Magnetism  [in Japanese]

    Endoh Yasuo

    … <p>Since the citation of this award is "neutron scattering research for low dimensional antiferromagnetism, metallic ferromagnetism as well as magnetic excitations in the superconducting oxides", I mainly describe here that neutron scattering is devoted as the decisive tool for the research of 'low dimensional magnetism'. …

    hamon 20(3), 223-228, 2010

    J-STAGE 

  • Spin-Wave Excitations in Effectively Half-Filled Mott Insulators

    KOIZUMI Hiroyasu

    … We study spin-wave excitations in an effectively half-filled Hubbard model, where the effectively half-filled situation is realized when all holes doped in the exactly half-filled parent compound become self-trapped lattice polarons, and their hopping rate is much slower than the neutron scattering time of magnetic excitation measurements. …

    Journal of the Physical Society of Japan 77(10), "104704-1"-"104704-10", 2008-10-15

    References (31)

  • Spin-Wave Excitations in Effectively Half-Filled Mott Insulators

    Koizumi Hiroyasu

    … We study spin-wave excitations in an effectively half-filled Hubbard model, where the effectively half-filled situation is realized when all holes doped in the exactly half-filled parent compound become self-trapped lattice polarons, and their hopping rate is much slower than the neutron scattering time of magnetic excitation measurements. …

    Journal of the Physical Society of Japan 77(10), 104704-104704, 2008

    J-STAGE 

  • Novel Spin Excitations in Optimally Electron-Doped Pr_<0.89>LaCe_<0.11>CuO_4

    FUJITA Masaki , MATSUDA Masaaki , FAK Bjorn , FROST Christopher D. , YAMADA Kazuyoshi

    … To study the detailed structure of the magnetic excitation spectrum, we performed a neutron scattering experiment on optimally electron-doped Pr<SUB>0.89</SUB>LaCe<SUB>0.11</SUB>CuO4 (<I>T</I><SUB>c</SUB>=25.5 K). … Well-defined spin excitations existed up to an energy of ω∼180 meV, which is consistent with the recent observation by Wilson <I>et al.</I> …

    Journal of the Physical Society of Japan 75(9), "93704-1"-"93704-4", 2006-09-15

    J-STAGE  References (19)

  • Magnetic Excitations in CoO

    Tomiyasu Keisuke , Itoh Shinichi

    Journal of the Physical Society of Japan 75(8), 084708-084708, 2006-08-15

    DOI 

  • Magnetic Excitations in CoO

    TOMIYASU Keisuke , ITOH Shinichi

    Magnetic excitations in CoO below <I>T</I><SUB>N</SUB>=289 K were investigated on single crystals and a powder specimen by using inelastic neutron-scattering spectrometers installed at a steady state neutron-source and a pulsed neutron source. … In single-crystal data, dispersion relations of the two magnetic excitation modes below 70 meV were determined along the symmetric directions. …

    Journal of the Physical Society of Japan 75(8), "84708-1"-"84708-11", 2006-08-15

    J-STAGE  References (24)

  • R-Dependence of Spin Exchange Interactions in RMnO_3 (R = Rare-Earth Ions)

    KAJIMOTO Ryoichi , MOCHIZUKI Hidenori , YOSHIZAWA Hideki , SHINTANI Hiroshi , KIMURA Tsuyoshi , TOKURA Yoshinori

    … Magnon excitations have been investigated for PrMnO_3 showing an A-type antiferromagnetic ordering and TbMnO_3 forming a long-period spin ordering by inelastic neutron scattering. …

    Journal of the Physical Society of Japan 74(9), 2430-2433, 2005-09-15

    References (17)

  • High Energy Magnetic Excitations from the Edge-sharing CuO2Chains in Ca2Y2Cu5O10

    Matsuda Masaaki , Kakurai Kazuhisa , Yethiraj Mohana , Oka Kunihiko

    Journal of the Physical Society of Japan 74(5), 1578-1581, 2005-05-15

    DOI 

  • High Energy Magnetic Excitations from the Edge-sharing CuO2 Chains in Ca2Y2Cu5O10

    MATSUDA Masaaki , KAKURAI Kazuhisa , YETHIRAJ Mohana , OKA Kunihiko

    … up to ∿14 meV that in the magnetically ordered state there is an anomalous broadening of spin-wave excitations along the chain, which is caused mainly by the antiferromagnetic interchain interactions [M. … In this study we extended an energy range of the measurement up to∿25 meV. … One mode corresponds to the relatively sharp spin-wave excitations, which broaden with increasing q_<chain> …

    Journal of the Physical Society of Japan 74(5), 1578-1581, 2005-05

  • R-Dependence of Spin Exchange Interactions in RMnO3 (R = Rare-Earth Ions)

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

    … Magnon excitations have been investigated for PrMnO<SUB>3</SUB> …

    Journal of the Physical Society of Japan 74(9), 2430-2433, 2005

    J-STAGE 

  • High Energy Magnetic Excitations from the Edge-sharing CuO2 Chains in Ca2Y2Cu5O10

    Matsuda Masaaki , Kakurai Kazuhisa , Yethiraj Mohana , Oka Kunihiko

    … up to ∼14 meV that in the magnetically ordered state there is an anomalous broadening of spin-wave excitations along the chain, which is caused mainly by the antiferromagnetic interchain interactions [M. … In this study we extended an energy range of the measurement up to ∼25 meV. … One mode corresponds to the relatively sharp spin-wave excitations, which broaden with increasing <I>q</I><SUB>chain</SUB> …

    Journal of the Physical Society of Japan 74(5), 1578-1581, 2005

    J-STAGE 

  • Spin Dependent Quantum Renormalization Factor in the One-Dimensional Heisenberg Antiferromagnetic Systems Determined by Inelastic Neutron Scattering Experiments

    ITOH Shinichi , ENDOH Yasuo , KAKURAI Kazuhisa , TANAKA Hidekazu

    … Inelastic neutron scattering experiments on the one-dimensional Heisenberg antiferromagnetic systems, CsNiCl_3 (S = 1), CsVCl_3 (S = 3/2) and CsCrCl_3 (S = 2), were performed, and the dispersion relation of the magnetic excitations at low temperature (E(q)) as well as the temperature dependence of the inverse magnetic correlation length (κ(T)) were measured. …

    Journal of the Physical Society of Japan 73(1), 269-274, 2004-01-15

    References (34)

  • Spin Dependent Quantum Renormalization Factor in the One-Dimensional Heisenberg Antiferromagnetic Systems Determined by Inelastic Neutron Scattering Experiments

    Itoh Shinichi , Endoh Yasuo , Kakurai Kazuhisa , Tanaka Hidekazu

    … (<I>S</I>=2), were performed, and the dispersion relation of the magnetic excitations at low temperature (<I>E</I>(<I>q</I>)) as well as the temperature dependence of the inverse magnetic correlation length (κ(<I>T</I>)) were measured. …

    Journal of the Physical Society of Japan 73(1), 269-274, 2004

    J-STAGE 

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