Non local theory of excitations applied to the Hubbard model (2009)
Kakehashi, Y., Nakamura, T., Fulde, P.
We propose a nonlocal theory of single-particle excitations. It is based on an off-diagonal effective medium and the projection operator method for treating the retarded Green function. The theory...
First-principles dynamical CPA to finite-temperature magnetism of transition metals (2009)
Kakehashi, Y., Tamashiro, T., Patoary, M. A. R., Nakamura, T.
We present here the first-principles dynamical CPA (coherent potential approximation) combined with the tight-binding LMTO LDA+U method towards quantitative calculations of the electronic structure...
Evidence of Strong Electron Correlations in Gamma-Iron (2009)
Kakehashi, Y., Patoary, M. Atiqur R., Tamashiro, T.
Single-particle excitation spectra of gamma-Fe in the paramagnetic state have been investigated by means of the first-principles dynamical coherent potential approximation theory which has recently...
Kakehashi, Y., Shimabukuro, T., Yasuda, C.
A new wavefunction which improves the Gutzwiller-type local ansatz method has been proposed to describe the correlated electron system. The ground-state energy, double occupation number, momentum...
Dynamical CPA and Tight-Binding LMTO Approach to Correlated Electron System (2008)
Kakehashi, Y., Shimabukuro, T., Tamashiro, T, Nakamura, T.
Dynamical Coherent-Potential Approximation (CPA) to correlated electrons has been extended to a system with realistic Hamiltonian which consists of the first-principles tight-binding Linear Muffintin...
Marginal Fermi Liquid Theory in the Hubbard Model (2005)
We find Marginal Fermi Liquid (MFL) like behavior in the Hubbard model on a square lattice for a range of hole doping and on-site interaction parameter U. Thereby we use a self-consistent projection...
Ab initio investigation of the Invar anomaly in ordered fcc Fe-Pt alloys (2005)
Khmelevskyi, S., Ruban, A. V., Kakehashi, Y., Mohn, P., Johansson, B.
Influence of surface roughness on the charging of insulating spacers in vacuum (2001)
Yamamoto, O, Takuma, T, Hamada, S, Kakehashi, Y, Ikoma, S, Nisimura, K, ...
CURIE-TEMPERATURE "SLATER-PAULING CURVE" (1988)
The systematic variation of the Curie-temperature "Slater-Pauling curve" has been explained for the first time on the basis of the finite-temperature theory of the local environment effect. The...
FINITE-TEMPERATURE THEORY OF MAGNETISM IN AMORPHOUS AND LIQUIDS (1988)
A finite-temperature theory of magnetism to amorphous and liquids is presented on the basis of the functional integral method. Numerical results for liquid Fe and Ni explain well the ratio of the...
ITINERANT-ELECTRON SPIN GLASS IN IRON-BASE ALLOYS (1988)
On the basis of the numerical calculations for the fcc Fe-Ni alloys, we have shown that the close-packed Fe alloys form a new type of itinerant-electron spin glass because of the non-linear magnetic...
VARIATIONAL APPROACH TO FINITE-TEMPERATURE MAGNETISM IN THE DEGENERATE NARROW BANDS (1988)
The variational approach which describes the local electron correlations at finite temperatures has been extended to the degenerate-band case. It reduces TC in the static approximation by a factor of...
CURIE-TEMPERATURE "SLATER-PAULING CURVE" (1988)
The systematic variation of the Curie-temperature "Slater-Pauling curve" has been explained for the first time on the basis of the finite-temperature theory of the local environment effect. The...
FINITE-TEMPERATURE THEORY OF MAGNETISM IN AMORPHOUS AND LIQUIDS (1988)
A finite-temperature theory of magnetism to amorphous and liquids is presented on the basis of the functional integral method. Numerical results for liquid Fe and Ni explain well the ratio of the...
ITINERANT-ELECTRON SPIN GLASS IN IRON-BASE ALLOYS (1988)
On the basis of the numerical calculations for the fcc Fe-Ni alloys, we have shown that the close-packed Fe alloys form a new type of itinerant-electron spin glass because of the non-linear magnetic...
VARIATIONAL APPROACH TO FINITE-TEMPERATURE MAGNETISM IN THE DEGENERATE NARROW BANDS (1988)
The variational approach which describes the local electron correlations at finite temperatures has been extended to the degenerate-band case. It reduces TC in the static approximation by a factor of...
CURIE-TEMPERATURE "SLATER-PAULING CURVE" (1988)
The systematic variation of the Curie-temperature "Slater-Pauling curve" has been explained for the first time on the basis of the finite-temperature theory of the local environment effect. The...
FINITE-TEMPERATURE THEORY OF MAGNETISM IN AMORPHOUS AND LIQUIDS (1988)
A finite-temperature theory of magnetism to amorphous and liquids is presented on the basis of the functional integral method. Numerical results for liquid Fe and Ni explain well the ratio of the...
ITINERANT-ELECTRON SPIN GLASS IN IRON-BASE ALLOYS (1988)
On the basis of the numerical calculations for the fcc Fe-Ni alloys, we have shown that the close-packed Fe alloys form a new type of itinerant-electron spin glass because of the non-linear magnetic...
VARIATIONAL APPROACH TO FINITE-TEMPERATURE MAGNETISM IN THE DEGENERATE NARROW BANDS (1988)
The variational approach which describes the local electron correlations at finite temperatures has been extended to the degenerate-band case. It reduces TC in the static approximation by a factor of...
CONDITIONS FOR THE EXISTENCE OF ORDERED STRUCTURE IN BINARY ALLOY SYSTEMS (1977)
The conditions for the existence of superlattice structures of fcc binary alloys are discussed by determining the ground state of the pairwise interaction model for arbitrary concentration. The...
CONDITIONS FOR THE EXISTENCE OF ORDERED STRUCTURE IN BINARY ALLOY SYSTEMS (1977)
The conditions for the existence of superlattice structures of fcc binary alloys are discussed by determining the ground state of the pairwise interaction model for arbitrary concentration. The...
CONDITIONS FOR THE EXISTENCE OF ORDERED STRUCTURE IN BINARY ALLOY SYSTEMS (1977)
The conditions for the existence of superlattice structures of fcc binary alloys are discussed by determining the ground state of the pairwise interaction model for arbitrary concentration. The...