Quantum criticality in La-doped CeIn

Applying pressure to CeIn₃ suppresses the antiferromagnetic ordering (T_N) to zero temperature and induces a magnetic to paramagnetic transition at a critical pressure 2.65 GPa. However, the nature of quantum criticality in CeIn₃ is still under debate, where both conventional and unconventional critical states are observed from various physical property measurements. Here we report experiments of Ce_1-xLa_xIn₃ system under pressure. The pressure evolution of T_N in Ce_1-xLa_xIn₃ series is similar to that of CeIn₃. For 50% La substitution, T_N of 4 K decreases with pressure and was completely suppressed at 1.31 GPa, where the non-fermi liquid behavior is observed. Interestingly, electrical resistivity and Hall coefficient measurements as a function of doping and pressure suggest that f-electrons in Ce_1-xLa_xIn₃ are delocalized before the system reaches the quantum critical point (QCP). [1] In this talk, the origin of the local maximum in Hall coefficient and the itinerant character of f-electrons beyond the QCP will be discussed comparatively for pure and La-diluted CeIn₃.

[1] S. Kim et al., J. Phys: Condens. Matter 33, 065604 (2021)