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RuO
" [J. Phys. Soc. Jpn. 71 (2002) 1993]Nomura, Takuji; Yamada, Kosaku*
Journal of the Physical Society of Japan, 78(1), P. 018001_1, 2009/01
The minus signs at the heads of the third and fifth lines in the right-hand side of eq. (37) should be plus signs.
RuO; Multi-band theoryNomura, Takuji; Hirashima, Dai*; Yamada, Kosaku*
Journal of the Physical Society of Japan, 77(2), p.024701_1 - 024701_10, 2008/02
Times Cited Count：8 Percentile：49.93(Physics, Multidisciplinary)We investigate possible collective spin excitation by calculating the dynamical spin susceptibility in the spin-triplet superconducting state of SrRuO. The effect of the fluctuating triplet-pairing condensate on the spin susceptibility is taken into account. The triplet pairing symmetry is assumed to be the most promising form: 
(
) 
(
+ 
. For small (maybe realistic) anisotropy of pairing interaction in spin space, we expect a possible low-energy spin-wave mode as a peak structure in the imaginary part of the dynamical spin susceptibility, isolated from the spin excitation continuum. The present work is a natural extension of previous single-band calculations to a more realistic three-band calculation.
Nomura, Takuji; Yamada, Kosaku*
Nihon Butsuri Gakkai-Shi, 59(12), p.893 - 897, 2004/12
A number of superconductors exhibiting anisotropic pairing have been discovered so far. In anisotropic superconductors, the attractive force originates from the 
component of the pair-scattering amplitude. We provide a unified view on the microscopic mechanism of anisotropic superconductivity on the basis of the Fermi liquid theory.
CoO
HONishikawa, Yunori; Ikeda, Hiroaki*; Yamada, Kosaku*
Journal of the Physical Society of Japan, 73(5), p.1127 - 1130, 2004/05
Times Cited Count：17 Percentile：65.14(Physics, Multidisciplinary)no abstracts in English
-wave spin-triplet superconductivity in the CoO
superconductor; A Case study on a 2D triangular lattice in the repulsive hubbard modelIkeda, Hiroaki*; Nishikawa, Yunori; Yamada, Kosaku*
Journal of the Physical Society of Japan, 73(1), p.17 - 20, 2004/01
Times Cited Count：52 Percentile：84.72(Physics, Multidisciplinary)no abstracts in English
Yanase, Yoichi*; Jujo, Takanobu*; Nomura, Takuji; Ikeda, Hiroaki*; Hotta, Takashi; Yamada, Kosaku*
Physics Reports; A Review Section of Physics Letters, 387(1-4), p.1 - 149, 2003/11
Times Cited Count：212 Percentile：83.22(Physics, Multidisciplinary)In this article we review essential natures of superconductivity in strongly correlated electron systems from a universal point of view. Here we consider materials such as high-
cuprates, BEDT-TTF organic superconductors, ruthenate SrRuO, and heavy fermion superconductors. After the review of experimental results, we explain the formalism to discuss superconducting properties of strongly correlated electron systems based on the Dyson-Gor'kov equations. Then, we introduce theoretical retults on cuprates, organics, ruthenate, and heavy fermion superconductors in this order.
Nomura, Takuji; Yamada, Kosaku*
no journal, ,
Theory of the microscopic mechanism of anisotropic superconductivity in strongly correlated electron systems is presented. After addressing the general theory on the basis of the perturbation theory in electron-electron interaction, we will focus on the spin-triplet superconductivity realized in SrRuO. Analysis of physical quantities is also presented.
