This paper explores the energy scales of the doped Anderson lattice model using dynamical mean-field theory (DMFT), using a continuous-time quantum Monte Carlo (CTQMC) impurity solver. We show that the low temperature properties of the lattice cannot be scaled using the single ion local Kondo temperature TK but instead are governed by a doping-dependent coherence temperature T∗ which can be used to scale the temperature dependence of the spectral function, transport properties, and entropy. At half-filling T∗ closely approximates the single ion TK, but as the filling nc is reduced to zero, T∗ also vanishes. The coherence temperature T∗ is shown to play a role of effective impurity Kondo temperature in the lattice model, and physical observables show significant evolution at T∗. In the DMFT framework we showed that the hybridization strength of the effective impurity model is qualitatively affected by the doping level, and determines T∗ in the lattice model.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics