Effect of Zn-site substitution with Ga on non-Fermi liquid behavior in PrIr2Zn20

Simultaneous collapse of antiferroquadrupolar order and superconductivity in PrIr$_{2}$Zn$_{20}$ by nonhydrostatic pressure

“…A theory based on the two-channel Anderson lattice model shows that T R increases as the c-f hybridization is increased [17]. In fact, an experimental study substituting Cd and Ga for Zn in PrIr 2 Zn 20 confirmed that T R is controlled by the strength of c-f hybridization [38]. Therefore, T R can be regarded as the measure of the strength of the c-f hybridization.…”

“…However, this relation does not hold for P > 6 GPa, where T R decreases with pressure. On the other hand, by substituting Ga for Zn in PrIr 2 Zn 20 , T R is increased as a result of the increase in the 4p electron density of states of the conduction bands [38]. Therefore, the decrease in T R for P > 6 GPa may result from the decrease of the density of states at the Fermi level.…”