23 citations · 59 across the 3 of their papers we have counts for
6 papers
A Possible Phase Transition in beta-pyrochlore Compounds
Kazumasa Hattori, Hirokazu Tsunetsugu
We investigate a lattice of interacting anharmonic oscillators by using a mean field theory and exact diagonalization. We construct an effective five-state hopping model with inter…
Effective Hamiltonian of Three-orbital Hubbard Model on Pyrochlore Lattice: Application to LiV_2O_4
Kazumasa Hattori, Hirokazu Tsunetsugu
We investigate heavy fermion behaviors in the vanadium spinel LiV_2O_4. We start from a three-orbital Hubbard model on the pyrochlore lattice and derive its low-energy effective Ha…
Theory of Ultrasonic Dispersion in Local Phonon Systems Coupled with Conduction Electrons
K. Hattori, K. Miyake
The physical origin of frequency dependence in elastic constants, which are often found in an ultrasound propagation in filled skutterudites and clathrate compounds, is investigate…
Critical Nature of Non-Fermi Liquid in Spin 3/2 Multipolar Kondo Model
Kazumasa Hattori
A multipolar Kondo model of an impurity spin S_I=3/2 interacting with conduction electrons with spin s_c=3/2 is investigated using boundary conformal field theory. A two-channel Ko…
Local Heavy Quasiparticle in Four-Level Kondo Model
Kazumasa Hattori, Yosuke Hirayama, Kazumasa Miyake
An impurity four-level Kondo model, in which an ion is tunneling among 4-stable points and interacting with surrounding conduction electrons, is investigated using both perturbativ…
Quasiparticle Interactions for f-Impurity Anderson Model with Crystalline-Electric-Field: Numerical Renormalization Group Study
Kazumasa Hattori, Satoshi Yotsuhashi, Kazumasa Miyake
The aspect of the quasiparticle interaction of a local Fermi liquid, the impurity version of f-based heavy fermions, is studied by the Wilson numerical renormalization group me…