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 ${\mathrm{PrV}}_2{\mathrm{Al}}_{20}$ with a non magnetic ${\mathrm{\Gamma }}_3$ doublet ground state, exhibiting antiferroquadrupole ordering below 0.7 K. For the [100] direction, we find that the high-field phase appears between 12 and 25 T, accompanied by a large jump at 12 T in the magnetoresistance ($\mathrm{\Delta }MR\sim 100\%$) and in the anisotropic magnetoresistivity ratio by $\sim 20\%$. 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.

• Received 23 January 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.256601