Magnetic Properties and Kondo Effect in Ce₃TiBi₅ under High Pressure

Abstract The magnetic properties and Kondo effect in Ce₃TiBi₅ with a quasi-one-dimensional structure were investigated using in situ high-pressure resistivity measurements up to 48 GPa. At ambient pressure, Ce₃TiBi₅ undergoes an antiferromagnetic (AFM) transition at T_N ∼ 5 K. Under high pressures within 8.9 GPa, we find that Kondo scattering contributes differently to the high-temperature resistance, R(T), depending on the applied current direction, demonstrating a significantly anisotropic Kondo effect. The complete P–T phase diagram has been constructed, in which the pressure dependence of T_N exhibits a dome-like shape. The AFM order remains robust under pressure, even when the coherence temperature T^* far exceeds 300 K. We attribute the observed anisotropic Kondo effect and the robust AFM to the underlying anisotropy in electronic hybridization under high pressure.