48 citations · 282 across the 20 of their papers we have counts for
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Specific Heat-Coefficient of YbAl3 Studied by Combined Nearly Free Electron Conduction Band Hybridized with Localized f Electrons with Correlation Effect
Yoshiki Imai, Tetsuro Saso
Based on the recently proposed band model, the electronic specific heat of moderately heavy electron compound YbAl are investigated. The band term of the Hamiltonian consists o…
Theory for Magnetic Anisotropy of Field-Induced Insulator-to-Metal Transition in Cubic Kondo Insulator YbB_{12}
Toshiyuki Izumi, Yoshiki Imai, Tetsuro Saso
Magnetization and energy gap of Kondo insulator YbB_{12} are calculated theoretically based on the previously proposed tight-binding model composed of Yb 5d and 4f orbital…
Absence of Hybridization Gap in Heavy Electron Systems and Analysis of YbAl3 in terms of Nearly Free Electron Conduction Band
Hiroyuki Kuroiwa, Yoshiki Imai, Tetsuro Saso
In the analysis of the heavy electron systems, theoretical models with c-f hybridization gap are often used. We point out that such a gap does not exist and the simple picture with…
Anomalous magnetic phase diagram in low-carrier two-band systems and possible application to CeOs4Sb12
Yoshiki Imai, Tetsuro Saso
Magnetic properties under the external field are investigated in low-carrier two-band systems, which may explain the nontrivial phase boundary found in temperature vs. magnetic fie…
Anomalous Metal-Insulator Transition in Filled Skutterudite CeOsSb
Yoshiki Imai, Keitaro Sakurazawa, Tetsuro Saso
Anomalous metal-insulator transition observed in filled skutterudite CeOsSb is investigated by constructing the effective tight-binding model with the Coulomb repulsion…
Calculation of Optical Conductivity, Resistivity and Thermopower of Filled Skutterudite CeRuSb based on a Realistic Tight-binding Model with Strong Correlation
Tetsuro Saso
The filled-skutterudite compound CeRuSb shows a pseudo-gap structure in the optical conductivity spectra similar to the Kondo insulators, but metallic behavior below 80…
Magnetic-Field-Induced Antiferromagnetism in Two-Dimensional Hubbard Model: Analysis of CeRhIn
Keitaro Sakurazawa, Hiroshi Kontani, Tetsuro Saso
We propose the mechanism for the magnetic-field-induced antiferromagnetic (AFM) state in a two-dimensional Hubbard model in the vicinity of the AFM quantum critical point (QCP), us…
Optical conductivity of filled skutterudites
Tetsuya Mutou, Tetsuro Saso
A simple tight-binding model is constructed for the description of the electronic structure of some Ce-based filled skutterudite compounds showing an energy gap or pseudogap behavi…
Calculation of Optical Conductivity of YbB using Realistic Tight-Binding Model
Tetsuro Saso
Based on the previously reported tight-binding model fitted to the LDA+U band calculation, optical conductivity of the prototypical Kondo insulator YbB is calculated theoret…
Formation Mechanism of Hybridization Gap in Kondo Insulators based on a Realistic Band Model and Application to YbB
Tetsuro Saso, Hisatomo Harima
A new LDA+U band calculation is performed on the Kondo insulator material YbB and an energy gap of about 0.001Ryd is obtained. Based on this, a simple tight-binding model wi…
Investigation of the Two-Particle-Self-Consistent Theory for the Single-Impurity Anderson Model and an Extension to the Case of Strong Correlation
Tetsuro Saso
The two-particle-self-consistent theory is applied to the single-impurity Anderson model. It is found that it cannot reproduce the small energy scale in the strong correlation limi…
Correlation Effects in Multi-Band Hubbard Model and Anomalous Properties of FeSi
Kentaro Urasaki, Tetsuro Saso
The two-band Hubbard model with the density of states obtained from the band calculation is applied for FeSi, which is suggested to be a Kondo insulator or a correlated band insula…
A Unified Theory of Dynamical Mean Field and Spin Fluctuations
Tetsuro Saso
A new approach is proposed which encompasses the dynamical mean field theory (DMFT) for strongly correlated electron systems and the self-consistent renormalization (SCR) theory of…
Correlation Effects on Optical Conductivity of FeSi
Kentaro Urasaki, Tetsuro Saso
Effects of electron correlation in FeSi are studied in terms of the two-band Hubbard model with the density of states obtained from the band calculation. Using the self-consistent…
Thermal and Dynamical Properties of the Two-band Hubbard Model Compared with FeSi
Kentaro Urasaki, Tetsuro Saso
We study the two-band Hubbard model introduced by Fu and Doniach as a model for FeSi which is suggested to be a Kondo insulator. Using the self-consistent second-order perturbation…
Self-consistent perturbational study of insulator-to-metal transition in Kondo insulators due to strong magnetic field
Tetsuro Saso
In order to study the effects of strong magnetic field on Kondo insulators, we calculate magnetization curves and single-particle excitation spectra of the periodic Anderson model…