The unusual ferromagnetism of LaCrGe₃ through the lens of magnetic domain depinning

The ferromagnetic compound LaCrGe₃ (T_C = 85 K) has proven to be a playground for studying the suppression of ferromagnetism under pressure. While LaCrGe₃ is known as an example in which a ferromagnetic quantum critical point is avoided by the appearance of an alternative magnetic phase, certain probes also revealed features similar to the ones in UGe₂ and ZrZn₂ which indicate two ferromagnetic phases FM1 and FM2. In LaCrGe₃, however, the existence of FM1 and FM2 has not been recognized in magnetization measurements so far. I will present our results from coercivity measurements and from a simple domain de-pinning model which support the presence of two FM phases. This revelation allows us to explain the unusual magnetization curve seen in previous studies, and may help to explain a range of anomalous behaviors observed in LaCrGe₃ at ambient pressure.