We study single-crystal CeCoIn${}_5$ with uniaxial pressure up to 3.97 kbar applied along the $c$ axis. We find a nonlinear dependence of the superconducting transition temperature $T_c$ on pressure, with a maximum close to 2 kbar. The transition also broadens significantly as pressure increases. We discuss the temperature dependence in terms of the general trend that $T_c$ decreases in anisotropic heavy-fermion compounds as they move toward three-dimensional behavior.

• Received 16 October 2010

DOI:https://doi.org/10.1103/PhysRevB.83.144510