Tricritical wings and modulated magnetic phases in LaCrGe${}_3$ under pressure

Abstract

We determined on the temperature-pressure-magnetic field ($T$-$p$-$H$) phase diagram of the ferromagnet LaCrGe${}_3$ from electrical resistivity measurements on single crystals. In ferromagnetic systems, quantum criticality is avoided either by a change of the transition order, becoming of the first order at a tricritical point, or by the appearance of modulated magnetic phases. In the first case, the application of a magnetic field reveals a wing-structure phase diagram as seen in itinerant ferromagnets such as ZrZn${}_2$ and UGe${}_2$. In the second case, no tricritical wings have been observed so far. Our investigation of LaCrGe${}_3$ reveals a double-wing structure indicating strong similarities with ZrZn${}_2$ and UGe${}_2$. But, unlike these, simpler systems, LaCrGe${}_3$ is thought to exhibit a modulated magnetic phase under pressure which already precludes it from a pressure-driven paramagnetic-ferromagnetic quantum phase transition in zero field. As a result, the $T$-$p$-$H$ phase diagram of LaCrGe${}_3$ shows both the wing structure as well as the appearance of new magnetic phases, providing the first example of this new possibility for the phase diagram of metallic quantum ferromagnets.

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