Giant Anisotropic Magnetoresistance due to Purely Orbital Rearrangement in the Quadrupolar Heavy Fermion Superconductor PrV2Al20

We report the discovery of giant and anisotropic magnetoresistance due to the orbital rearrangement in a non magnetic correlated metal. In particular, we measured the magnetoresistance under fields up to 31.4 T in the cubic Pr-based heavy fermion superconductor PrV2Al20 with a non magnetic Gamma(3) doublet ground state, exhibiting antiferroquadrupole ordering below 0.7 K. For the [100] direction, we find that the highfield phase appears between 12 and 25 T, accompanied by a large jump at 12 T in the magnetoresistance (Delta MR similar to 100%) and in the anisotropic magnetoresistivity ratio by similar to 20%. These observations indicate that the strong hybridization between the conduction electrons and anisotropic quadrupole moments leads to the Fermi surface reconstruction upon crossing the field-induced antiferroquadrupole (orbital) rearrangement.