Electronic Order with Staggered Kondo and Crystalline Electric Field Singlets

Abstract

Novel electronic order is found theoretically for a system where even number of localized electrons per site are coupled with conduction electrons. For precise quantitative study, a variant of the Kondo lattice model is taken with crystalline electric field (CEF) singlet and triplet states for each site. Using the dynamical mean-field theory combined with the continuous-time quantum Monte Carlo method, a staggered order with alternating Kondo and CEF singlets is identified for a case with one conduction electron per site being distributed in two conduction bands each of which is quarter-filled. This electronic order accompanies a charge density wave (CDW) of conduction electrons that accumulate more on Kondo-singlet sites than on CEFsinglet sites. Possible relevance of the present order to the scalar order in PrFe4P12 is discussed.

Diagonal Composite Order in a Two-Channel Kondo Lattice

“…Then highly accurate treatment of the reservoir is required for numerical approach. Recently, a continuous-imaginary-time quantum Monte Carlo (CTQMC) scheme [15] has proven powerful enough in solving the effective impurity problem at finite temperature [16,17].…”

New Aspects of Electronic Ordered States due tof2Configuration of Pr-Based Systems

“…21) A recent theory predicts the periodic ordering of the inequivalent totally symmetric singlet states: the Kondo singlet arising from p-f hybridization and the CF singlet with less hybridization. 22) This mechanism rouses again the discussion on the dual nature of localized and itinerant f electrons considered for the heavy-electron superconductor UPd 2 Al 3 .…”

Spin Density Wave Driven by Quadrupolar Kondo Effect in Two-Channel Kondo Lattice

“…These features are similar to the staggered order with Kondo and crystalline electric field singlets found in our previous work. 12) We make a comment on the region with J 0.3, where the SDW transition temperature becomes extremely small as seen in Fig. 3(a).…”