Abstract
Specific heat, magnetic susceptibility, and electrical transport measurements were performed at ambient pressure on high quality single-crystal specimens of $\mathrm{Ce}\mathrm{Rh}{\mathrm{In}}_{5}$ down to ultralow temperatures. We report signatures of an anomaly observed in all measured quantities consistent with a bulk thermodynamic phase transition to a superconducting state at ${T}_{c}=110\phantom{\rule{0.3em}{0ex}}\mathrm{mK}$. Occurring far below the onset of antiferromagnetism at ${T}_{N}=3.8\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, this transition appears to involve a significant portion of the available low-temperature density of electronic states, exhibiting an entropy change in line with that found in other members of the 115 family of superconductors tuned away from quantum criticality.
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