This paper reviews experimental evidence and the related theoretical background on exotic
phenomena arising from local quadrupolar degrees of freedom. Recent extensive studies on …

Over the past 35 years, research on unconventional superconductivity in heavy-fermion
systems has evolved from the surprising observations of unprecedented superconducting …

PrV 2 Al 20 is a rare example of a heavy-fermion system based on strong hybridization
between conduction electrons and nonmagnetic quadrupolar moments of the cubic Γ 3 …

We report the discovery of a pressure-induced heavy fermion superconductivity in a
nonmagnetic orbital ordering state in the cubic compound PrTi 2 Al 20. In particular, we …

The cubic compound PrTi 2 Al 20 is a quadrupolar Kondo lattice system that exhibits
quadrupolar ordering due to the non-Kramers Γ 3 ground doublet and has strong …

Orbital degrees of freedom in condensed matter could play important roles in forming a
variety of exotic electronic states by interacting with conduction electrons. In 4 f-electron …

Crystal growth and full structure determination of compounds adopting the CeCr2Al20
structure type, LnTi2Al20 (Ln= La–Pr, Sm, and Yb), LnV2Al20 (Ln= La–Pr, and Sm), and …

PrV 2 Al 20 is a heavy-fermion superconductor based on the cubic Γ 3 doublet that exhibits
nonmagnetic quadrupolar ordering below∼ 0.6 K. Our magnetotransport study on PrV 2 Al …

This review summarizes the synthetic aspects, the structural and crystal chemical
peculiarities as well as the physical properties of the members of the CeCr2Al20 type family …

Materials with non-Kramers doublet ground states naturally manifest the two-channel Kondo
effect, as the valence fluctuations are from a non-Kramers doublet ground state to an excited …