Pressure-dependent magnetotransport measurement in Kagome metal Yb${}_{0.5}$Co_3Ge${}_3$

Abstract

Kagome materials are known to be an ideal platform that hosts a plethora of interesting phases such as topological states, electronic correlation, and magnetism, owing to their unique band structure and geometry. We report magnetotransport measurement in Kagome metal Yb${}_{0.5}$Co_3Ge${}_3$ as a function of pressure. Below $\sim 25^{\circ }$ K the temperature dependence of resistance shows an upturn that is accompanied by a strong negative magnetoresistance, which could be attributed to Kondo effect. Upon pressurization above 1 GPa the resistance shows a reduction as a function of temperature below $4^{\circ }$ K, along with a further enhanced negative magnetoresistance. This might indicate an onset of a pressure-induced Kondo coherence effect.