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Pressure evolution of the normal- and superconducting-state properties of the line-nodal material CaSb$_2$ revealed by $^{123}$Sb nuclear quadrupole resonance
CaSb$_2$ is the Dirac line-nodal material that exhibits a superconducting (SC) transition at 1.7 K. In spite of its conventional SC state at ambient pressure, the transition temperature $T_{\mathrm{c}}$ shows a peak structure against hydrostatic pressure. We performed ac magnetic susceptibility and $^{123}$Sb nuclear quadrupole resonance (NQR) measurements on single-crystalline …