Investigating the pressure dependence of the superconducting (SC) transition temperature $T_{\mathrm{c}}$ is crucial for understanding the SC mechanism. Herein, we report on the pressure dependence of $T_{\mathrm{c}}$ in the nonmagnetic topological line-nodal material ${\mathrm{CaSb}}_2$ based on measurements of electric resistance and alternating current magnetic susceptibility. $T_{\mathrm{c}}$ initially increases with increasing pressure and peaks at $\sim$ 3.1 GPa. With a further increase in pressure, $T_{\mathrm{c}}$ decreases and finally becomes undetectable at 5.9 GPa. Because no signs of phase transition or Lifshitz transition are observed in the normal state, the peculiar peak structure of $T_{\mathrm{c}}$ suggests that ${\mathrm{CaSb}}_2$ has an unconventional SC character.

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• Superconductivity
• Superconductors
• Topological materials
• AC susceptibility measurements
• Band structure methods
• Pressure effects
• Resistivity measurements