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High pressure electrical resistivity  ρ   ab   measurements on intermetallic Pr(Co, Ni, Pt) 2 B 2 C compounds were performed down to 2 K. At ambient pressure the  $\rho _{ab} (T)$  curves for the non‐superconducting Pr(Co, Ni) 2 B 2 C compounds exhibit magnetic correlations at about 10 and 4 K, respectively. At low temperatures, PrCo 2 B 2 C shows a large spin‐dependent electron scattering in comparison to PrNi 2 B 2 C. Under applied pressure, the magnetic scattering tends to be suppressed more effectively in PrCo 2 B 2 C than in PrNi 2 B 2 C. The low‐temperature behavior of  $\rho _{ab} (T,P)$  for PrNi 2 B 2 C and PrCo 2 B 2 C suggests a spin fluctuation mechanism. On the other hand, the PrPt 2 B 2 C compound shows superconductivity at about 6 K and under pressure its superconducting transition temperature tends to be degraded at a rate  ${\rm d}T_{{\rm c}} /{\rm d}P = {-} 0.34\;{\rm K/GPa}$ , as expected in compounds with transition metals. The experimental results in Co‐, Ni‐, and Pt‐based compounds are analyzed from the point of view of the external and chemical internal pressure effects.

Pressure effects in PrT 2 B 2 C (T = Co, Ni, Pt): Applied and chemical pressure