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Tsutsui, Kenji; Toyama, Takami*; Koshibae, Wataru*; Maekawa, Sadamichi
Journal of Physics; Conference Series, 400(3), p.032105_1 - 032105_4, 2012/12
Times Cited Count：1 Percentile：46.41(Physics, Applied)The two-dimensional nickelate La
Sr
NiO
has received special attention as a reference system of high-
cuprates. The undoped nickelate (
=0) has the charge-transfer gap in the optical conductivity. Upon doping of holes, a broad spectrum appears in the gap. We have shown theoretically that the broad spectrum comes from excitations to the low spin states. In the Ni 
-edge resonant inelastic X-ray scattering (RIXS) measurement, the momentum-resolved charge excitations are obtained. In this study, we examine theoretically the RIXS spectra on nickelates by using numerically exact diagonalization techniques on the two-band Hubbard model. We also calculate other spectra such as the dynamical charge density function and discuss what excitations appear in the RIXS spectrum.
Sakai, Toru; Nakano, Hiroki*
Journal of Physics; Conference Series, 400(3), p.032076_1 - 032076_4, 2012/12
Times Cited Count：0 Percentile：0.03(Physics, Applied)The magnetization process of the S=1/2 kagome-lattice quantum antiferromagnet is investigated using the numerical exact diagonalization up to 39-site clusters, in comparison with the triangular-lattice one. The finite-size scaling analysis indicates the "magnetization ramp" phenomenon, as a novel field-induced quantum phase transition, at 1/3 of the saturation magnetization in the kagome-lattice system, while the conventional 1/3 magnetization plateau in the triangular-lattice one.
SiTateiwa, Naoyuki; Matsuda, Tatsuma; Haga, Yoshinori; Fisk, Z.; Onuki, Yoshichika
Journal of Physics; Conference Series, 400(2), p.022123_1 - 022123_4, 2012/12
Times Cited Count：0 Percentile：0.03(Physics, Applied)The pressure dependent electrical resistivity of URuSi has been studied at high pressure across the first order phase boundary of 
where the ground state switches under pressure from "hidden order" (HO) to large moment antiferromagnetic (LAFM) states. We analyze the data using the polynomial in 
expression 
. The analysis finds the relation 
in the HO phase. While the pressure dependence of 
is very weak, 
is roughly proportional to . This suggests a strong correlation between the anomalous quasiparticle scattering and the superconductivity and that both have a common origin.
Higashi, Yoichi*; Nagai, Yuki; Machida, Masahiko; Hayashi, Nobuhiko*
Journal of Physics; Conference Series, 400(2), p.022025_1 - 022025_4, 2012/12
Times Cited Count：2 Percentile：63.55(Physics, Applied)no abstracts in English
Mori, Michiyasu; Hikino, Shinichi*; Takahashi, Saburo; Maekawa, Sadamichi
no journal, ,
