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Orbital degrees of freedom in condensed matters could play important roles informing a variety of exotic electronic states by interacting with conductionelectrons. In 4f electron systems, because of strong intra-atomic spin-orbitcoupling, an orbitally degenerate state inherently carries quadrupolar degreesof freedom. The present work has focussed on a purely quadrupole-active systemPrIr2Zn20 showing superconductivity in the presence of an antiferroquadrupoleorder at TQ = 0.11 K. We observed non-Fermi liquid (NFL) behaviors emerging inthe electrical resistivity and the 4f contribution to the specific heat, C_4f,in the paramagnetic state at T > TQ. Moreover, in magnetic fields below 6 T,all data set of the electrical resistivity and C_4f(T) are well scaled withcharacteristic temperatures T0's. This is the first observation of the NFLstate in the nonmagnetic quadrupole-active system, whose origin isintrinsically different from that observed in the vicinity of the conventionalquantum critical point. It implies possible formation of a quadrupole Kondolattice resulting from hybridization between the quadrupoles and the conductionelectrons. Below 0.13 K, the electrical resistivity and C_4f(T) exhibitanomalies as B approaches 5 T. This is the manifestation of a field-inducedcrossover toward a Fermi-liquid ground state in the quadrupole Kondo lattice.

Quadrupole-Driven Non-Fermi Liquid and Magnetic-Field Induced Heavy Fermion States in a Non-Kramers Doublet System