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The infinite-layer nickelates, isostructural to the high-Tc superconductorcuprates, have risen as a promising platform to host unconventionalsuperconductivity and stimulated growing interests in the condensed mattercommunity. Despite numerous researches, the superconducting pairing symmetry ofthe nickelate superconductors, the fundamental characteristic of asuperconducting state, is still under debate. Moreover, the strong electroniccorrelation in the nickelates may give rise to a rich phase diagram, where theunderlying interplay between the superconductivity and other emerging quantumstates with broken symmetry is awaiting exploration. Here, we study the angulardependence of the transport properties on the infinite-layer nickelateNd0.8Sr0.2NiO2 superconducting films with Corbino-disk configuration. Theazimuthal angular dependence of the magnetoresistance (R({\phi})) manifests therotational symmetry breaking from isotropy to four-fold (C4) anisotropy withincreasing magnetic field, revealing a symmetry breaking phase transition.Approaching the low temperature and large magnetic field regime, an additionaltwo-fold (C2) symmetric component in the R({\phi}) curves and an anomalousupturn of the temperature-dependent critical field are observed simultaneously,suggesting the emergence of an exotic electronic phase. Our work uncovers theevolution of the quantum states with different rotational symmetries andprovides deep insight into the global phase diagram of the nickelatesuperconductors.

Rotational symmetry breaking in superconducting nickelate Nd0.8Sr0.2NiO2 films