Chiral anomaly and ultrahigh mobility in crystalline HfT e5

HfT e₅ is predicted to be a promising platform for studying topological phases. Here through an electrical transport study, we present an observation of chiral anomaly and ultrahigh mobility in HfT e₅ crystals. Negative magnetoresistivity in HfT e₅ is observed when the external magnetic and electrical fields are parallel (B//E) and quickly disappears once B deviates from the direction of E. Quantitative fitting further confirms the chiral anomaly as the underlying physics. Moreover, by analyzing the conductivity tensors of longitudinal and Hall traces, ultrahigh mobility and ultralow carrier density are revealed in HfT e₅ , which paves the way for potential electronic applications.