35 research outputs found
Competition between crystalline electric field singlet and itinerant states of f electrons
A new kind of phase transition is proposed for lattice fermion systems with
simplified f^2 configurations at each site. The free energy of the model is
computed in the mean-field approximation for both the itinerant state with the
Kondo screening, and a localized state with the crystalline electric field
(CEF) singlet at each site. The presence of a first-order phase transition is
demonstrated in which the itinerant state changes into the localized state
toward lower temperatures. In the half-filled case, the insulating state at
high temperatures changes into a metallic state, in marked contrast with the
Mott transition in the Hubbard model. For comparison, corresponding states are
discussed for the two-impurity Kondo system with f^1 configuration at each
site.Comment: 10 pages LaTeX , 2 eps figures Accepted for publication in Z.Phys.
SP-A Suppresses Lung Cancer Progression
Excel Spread Sheet of Sycan River, site SY-5, water surface elevation and a bed profile comparison from the dates 4/12/2004, 5/3/2005, 6/25/2004, and 05/13/2004
Partial Ferromagnetism in Semimetallic Two-Band Models(New Developments in Strongly Correlated Electron Systems)
この論文は国立情報学研究所の電子図書館事業により電子化されました