Abstract
Thorough resistivity measurements on single crystals of CeZn${}_{11}$ under pressure $p$ and magnetic field $H$ are presented. At ambient pressure, CeZn${}_{11}$ orders antiferromagnetically at ${T}_{N}=2$ K. The pressure dependence of the resistivity reveals an increase of the Kondo effect. We determine the pressure evolution of the magnetic exchange interaction between conduction and localized $4f$ electrons. It qualitatively reproduces the pressure evolution of the magnetic ordering temperature ${T}_{{O}_{1}}$ (with ${T}_{{O}_{1}}={T}_{N}$ at ambient pressure). In addition to ${T}_{{O}_{1}}$, a new anomaly ${T}_{{O}_{2}}$ appears under pressure. Both anomalies are found to increase with applied pressure up to $4.9$ GPa, indicating that CeZn${}_{11}$ is far from a pressure induced quantum critical point. Complex $T$-$H$ phase diagrams are obtained under pressure which reveal the instability of the ground state in this compound.
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