反強磁性フント則結合をもつ5f^2一重項の基底状態の2軌道アンダーソン格子モデルに基づく反強磁性スピンのゆらぎを自己無撞着に繰り込む理論

概要

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The pseudo-spin dynamical susceptibility based on the two-orbital Anderson lattice model of 5f^2-singlet ground state with the antiferromagnetic Hund's-rule coupling is investigated. We employ the energy level scheme of 5f^2-state in the body centered tetragonal crystalline field that are obtained by diagonalizing the pseudo-spin Hamiltonian i.e. the Hamiltonian of the antiferromagnetic Hund's-rule coupling. This energy level scheme is shown by the two orbitals of two 5f-electrons and the pseudo-spins. We look into the pseudo-spin dynamical susceptibility based on this two-orbital Anderson lattice model with two 5f-electrons with the pseudo-spins within the self-consistent renormalization theory of spin fluctuations (SCR theory). The SCR theory enables us to deal with the pseudo-spin dynamical susceptibility beyond the random phase approximation. From the investigations it is possible for us to analyze the results of neutron scattering experiments of URu_2Si_2 and the ones of nuclear spin relaxation rates in nuclear magnetic resonance of URu_2Si_2.
近畿大学工業高等専門学校の論文
2004-12-01