Pressure induced multicriticality and electronic instability in quasi-kagome ferromagnet URhSn

TL;DR

This study reveals a pressure-induced quantum phase transition in URhSn with bicritical points, involving Fermi surface reconstruction and magnetic electron behavior, highlighting complex electronic and magnetic interplay.

Contribution

It uncovers a novel pressure-induced quantum phase transition with bicritical points and Fermi surface changes in URhSn, combining localized and itinerant electron descriptions.

Findings

Identification of bicritical points at 6.25 GPa.

Observation of Fermi surface reconstruction.

Evidence of marginal Fermi-liquid behavior.

Abstract

We report an unconventional class of pressure induced quantum phase transition, possessing two bicritical points at 6.25 GPa in URhSn. This unique transformation accompanies a Fermi surface reconstruction, demarcating competing ordered phases suitably described with localized and itinerant description of the magnetic $5f$-electrons. Ferromagnetic fluctuations over a wide range of temperatures and pressures in the pressure-induced low temperature phase are evidenced by a robust $T^{5/3}$ temperature dependence of resistivity up to 11 GPa, which is a characteristic of elusive marginal Fermi-liquid state.