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We report the discovery of giant and anisotropic magnetoresistance due to theorbital rearrangement in a non-magnetic correlated metal. In particular, wemeasured the magnetoresistance under fields up to 31.4 T in the cubic Pr-basedheavy fermion superconductor PrV$_2$Al$_{20}$ with a non-magnetic $\Gamma _3$doublet ground state, exhibiting antiferro-quadrupole ordering below 0.7 K. Forthe [100] direction, we find that the high-field phase appears between 12 T and25 T, accompanied by a large jump at 12 T in the magnetoresistance ($\Delta MR\sim $ 100 $\% $) and in the anisotropic magnetoresistivity (AMR) ratio by$\sim $ 20 $\% $. These observations indicate that the strong hybridizationbetween the conduction electrons and anisotropic quadrupole moments leads tothe Fermi surface reconstruction upon crossing the field-inducedantiferro-quadrupole (orbital) rearrangement.

Giant Anisotropic Magnetoresistance due to Purely Orbital Rearrangement in the Quadrupolar Heavy Fermion Superconductor PrV$_2$Al$_{20}$