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We demonstrate the low temperature suppression of the platinum (Pt) spinNernst angle in bilayers consisting of the antiferromagnetic insulator hematite($\alpha$-Fe$_2$O$_3$) and Pt upon measuring the transverse spin Nernstmagnetothermopower (TSNM). We show that the observed signal stems from theinterplay between the interfacial spin accumulation in Pt originating from thespin Nernst effect and the orientation of the N\'eel vector of$\alpha$-Fe$_2$O$_3$, rather than its net magnetization. Since the latter isnegligible in an antiferromagnet, our device is superior to ferromagneticstructures, allowing to unambiguously distinguish the TSNM from thermallyexcited magnon transport (TMT), which usually dominates in ferri/ferromagnetsdue to their non-zero magnetization. Evaluating the temperature dependence ofthe effect, we observe a vanishing TSNM below ~100 K. We compare these resultswith theoretical calculations of the temperature dependent spin Nernstconductivity and find excellent agreement. This provides evidence for avanishing spin Nernst angle of Pt at low temperatures and the dominance ofextrinsic contributions to the spin Nernst effect.

Low Temperature Suppression of the Spin Nernst Angle in Pt