High-quality single crystal growth and strongly correlated electronic states in rare earth and actinide compounds

We review the nature of strongly correlated electronic states in rare earth and actinide compounds, focusing on localized versus itinerant electronic states in CeRhIn₅, quantum critical phenomena in YbIr₂Zn₂₀, residual resistivity in CeCu₆, metamagnetism in heavy fermion compounds, and unconventional superconductivity in CeIrSi₃without inversion symmetry in the crystal structure, emphasizing that sample quality is essentially important to clarify the characteristic features for the heavy fermion compounds.