Destabilization of ferromagnetism by frustration and realization of a nonmagnetic Mott transition in the quarter-filled two-orbital Hubbard model

Kubo, Katsunori

Physical Review B, 103(8), p.085118_1 - 085118_7, 2021/02

https://doi.org/10.1103/PhysRevB.103.085118

Nematic and time-reversal breaking superconductivities coexisting with quadrupole order in a system

Kubo, Katsunori

Physical Review B, 101(6), p.064512_1 - 064512_10, 2020/02

https://doi.org/10.1103/PhysRevB.101.064512

Anisotropic superconductivity emerging from the orbital degrees of freedom in a non-Kramers doublet system

Kubo, Katsunori

Journal of the Physical Society of Japan, 87(7), p.073701_1 - 073701_4, 2018/07

https://doi.org/10.7566/JPSJ.87.073701

Influence of lattice structure on multipole interactions in non-Kramers doublet systems

Kubo, Katsunori; Hotta, Takashi*

Physical Review B, 95(5), p.054425_1 - 054425_6, 2017/02

https://doi.org/10.1103/PhysRevB.95.054425

Itinerant-localized transitions in magnetic phases of the periodic Anderson model

Kubo, Katsunori

Physics Procedia, 75, p.214 - 220, 2015/12

https://doi.org/10.1016/j.phpro.2015.12.027

Variational Monte Carlo study of magnetic states in the periodic Anderson model

Kubo, Katsunori

Journal of Physics; Conference Series, 592(1), p.012039_1 - 012039_6, 2015/03

https://doi.org/10.1088/1742-6596/592/1/012039

Ferromagnetism and Fermi surface transition in the periodic Anderson model; Second-order phase transition without symmetry breaking

Kubo, Katsunori

Physical Review B, 87(19), p.195127_1 - 195127_9, 2013/05

https://doi.org/10.1103/PhysRevB.87.195127

Strength and impermeability recovery of siliceous mudstone from complete failure

Sugita, Yutaka; Sanada, Masanori; Fujita, Tomoo; Hashiba, Kimihiro*; Fukui, Katsunori*; Okubo, Seisuke*

Dai-13-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.207 - 212, 2013/01

Radionuclide migration can be undesirably increased by weakening the mechanical properties of a rock mass in the excavated disturbed zone (EDZ) around the tunnels of a geolical disposal facility for high level radioactive waste. Laboratory testing of loading stress and loading time on failed siliceous mudstone specimens has identified the potential for the long-term recovery of the strength and impermeability of the rock mass in the EDZ.

Phenomenological study on crystalline rock for evaluating of long-term behavior (Contract research)

Okubo, Seisuke*; Fukui, Katsunori*; Hashiba, Kimihiro*; Hikima, Ryoichi; Tanno, Takeo; Sanada, Hiroyuki; Matsui, Hiroya; Sato, Toshinori

JAEA-Research 2011-040, 54 Pages, 2012/02

JAEA-Research-2011-040.pdf:2.85MB

With respect to high-level radioactive waste disposal, knowledge of the long-term mechanical stability of shafts and galleries excavated in rock are required, not only during construction and operation but also over a period of thousands of years after closure. Therefore, it is very important to understand the time-dependent behavior of rock for evaluating long-term mechanical stability. This report describes the results of the activities in FY2010. In Chapter 1, we provide an overview and the background to this study. In Chapter 2, the results of a long-term creep test on Tage tuff, started in FY1997 are described. In Chapter 3, the relation of loading-rate dependency of strength and stress dependency of creep life, the relationship of time dependency and probability distribution of strength or creep life and size effects are discussed to indicate more clearly the meaning of the value of "n" to express the degree of time dependency of the rock. In Chapter 4, failure criterions of a rock mass considering time dependency are discussed. In Chapter 5, the FEM analysis implemented with a generalized variable-compliance-type constitutive equation considering the change of "n" in confining pressure and strength distribution of rock mass carried out to clarify the long-term behavior of Toki granite is described. Finally, based on the numerical analysis, an in situ testing method is proposed.

Correlation effects on antiferromagnetism in Fe pnictides

Kubo, Katsunori; Thalmeier, P.*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA121_1 - SA121_3, 2011/07

https://doi.org/10.1143/JPSJS.80SA.SA121