By means of a specific heat, susceptibility, and high-pressure electrical resistivity study, we show that the local magnetic moments of the intercalated V ions in ${\mathrm{V}}_5{\mathrm{S}}_8$ realize a prototype of Kondo lattice system, where an antiferromagnetic order of the moments coexists with a Fermi liquid in the ${\mathrm{VS}}_2$ layers with intermediate heavy fermion properties. Our data analysis suggests a simultaneous suppression of Fermi-liquid behavior and of antiferromagnetic order at a critical pressure, $P_c=10$ GPa, the signature of a quantum critical point. This result supports a Kondo lattice scenario and raises the question whether, in the paramagnetic phase at higher pressures, the heavy quasiparticles survive or form a non-Fermi liquid phase governed by the Kondo interaction.

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• High-pressure studies
• Kondo effect
• RKKY interaction
• Heavy-fermion systems
• Strongly correlated systems
• Transition metal dichalcogenides