We discover superconductivity (SC) in ${\mathrm{LaAgSb}}_2$ at ambient pressure and its close correlation with a charge density wave (CDW) under pressure. The superconducting transition temperature ($T_c$) exhibits a sharp peak at a CDW critical pressure of 3.2 GPa. We demonstrate that the carriers inhabiting the Sb-square net are crucial not only in the formation of CDW but also in SC for their relatively strong electron-phonon coupling (EPC). Furthermore, theoretical EPC strength in pristine ${\mathrm{LaAgSb}}_2$ cannot explain the observed peak with $T_c\sim 1$ K, which indicates that an additional mechanism reinforces SC only around the CDW critical pressure.

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• Charge density waves
• High-pressure studies
• Superconductivity
• Intermetallic compounds
• Dilution refrigerator
• First-principles calculations
• Magnetization measurements
• Resistivity measurements
• Specific heat measurements