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We present a study of electrical transport properties of $R$Bi$_2$ ($R$ = La,Ce) under hydrostatic pressure up to $\sim$ 2.5 GPa. These measurements arecomplemented by thermodynamic measurements of the specific heat on CeBi$_2$ atdifferent pressures up to 2.55 GPa. For CeBi$_2$, we find a moderate increaseof the antiferromagnetic transition, $T_\text N$, from 3.3 K to 4.4 K bypressures up to 2.55 GPa. Notably, resistance measurements for both CeBi$_2$and LaBi$_2$ show signatures of superconductivity for pressures above $\sim$1.7 GPa. However, the absence of superconducting feature in specific heatmeasurements for CeBi$_2$ indicates that superconductivity in CeBi$_2$ (andmost likely LaBi$_2$ as well) is not bulk and likely originates from traces ofBi flux, either on the surface of the plate-like samples, or trapped inside thesample as laminar inclusions.

Physical properties of $R$Bi$_2$ ($R=$La, Ce) under pressure