Anisotropic magnetotransport properties of the heavy-fermion superconductor CeRh2As2

Here, we report anisotropic resistivity measurements of the heavy-fermion superconductor CeRh2As2 in magnetic fields up to 16 T and temperatures down to 0.35 K. The measured CeRh2As2 resistivity shows a signature corresponding to the suggested quadrupole-density-wave order state at T0~0.5 K for both measured directions. For a magnetic field applied along the tetragonal a axis, T0 is enhanced with magnetic field reaching ~1.75 K at 16 T. Further, a magnetic field-induced transition occurs at μ0Hm ~ 8.1 T corresponding to a change to a new broken symmetry state. For a magnetic field applied along the c axis, T0 is suppressed below our base temperature ~0.35 K by μ0H ~ 4.5 T, a field close to the previously reported field-induced transition within the superconducting state suggested to be from an even-parity to an odd-parity state. Our results indicate that the multiple superconducting phases in CeRh2As2 are intimately tied to the suppression of the proposed quadrupole-density-wave phase at T0.