Kavli Affiliate: Joel Moore
| Summary:
Standard bulk probes of multiband superconductors cannot assign pairing gaps to specific electron or hole Fermi surfaces. Here we show that thermal Hall transport ($κ_xy$), constrained by specific heat and normal-state magnetotransport, resolves this ambiguity in the compensated heavy-fermion superconductor CeRu$_2$. Fixing the gap magnitudes ($Δ_e/k_Bapprox 13$K, $Δ_h/k_Bapprox 8$K) and band mobilities completely determines the electronic degrees of freedom in $κ_xx$ and $κ_xy$. A low-field sign reversal in $κ_xy$ places the larger gap on the heavy Ce $4f$ electron sheets and the smaller on the hole sheets.
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