Realistic model of cubic hastatic order

We study the role of Kondo physics in cubic materials with non-Kramers doublet grounds states, motivated by PrV2Al20 and other compounds. These systems generically display a two-channel Kondo effect, involving valence fluctuations between the non-Kramers doublet ground state and an excited Kramers doublet. In contrast to the single channel case, here the formation of a heavy Fermi liquid or Kondo insulator requires a channel symmetry-breaking phase transition, known as hastatic order. Introducing a simple but realistic two-channel Anderson lattice model, we explore the experimental consequences of hastatic order. These include a necessary breaking of time-reversal symmetry as indicated by the development of a conduction electron magnetic moment.