Enhancement of a Scalar Type of Multipole Due to Multiorbital Kondo Effect(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

論文の詳細を見る
A new feature of Kondo effect due to an orbitally degenerate impurity is presented for a crystal-field singlet-triplet case in the f^2 configuration. There are two stable states at low temperatures: one is a Fermi-liquid dominated by the f^2 singlet; the other is a non-Fermi liquid stabilized by a quadrupolar type of exchange interaction between the f^2 triplet and conduction electrons. The numerical renormalization group analysis shows that the competition of both states strongly enhances a coupling of conduction electrons with a scalar type of hexadecapolar moment of the impurity state, indicating that the charge degrees of freedom is relevant for the multiorbital case. This result supports the superiority of high-rank multipoles in f-electron systems such as the Pr-based filled skutterudite compounds.
社団法人日本物理学会の論文
2007-07-15