Work

Band-Resolved Superconducting Gaps via the Thermal Hall Effect in CeRu2

Year: 2026

Type: preprint

Abstract: 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 ($Δ_e/k_B\approx 13$K, $Δ_h/k_B\approx 8$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.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2610.22361

Authors: Hall, Darian, Cairns, Luke Pritchard, Rowland, Nico, Lyu, Yuanqi, Yamakawa, Kohtaro, Rodriguez, Josue, Chanteloup, Kirin, Perrodin, Didier, Moore, Joel E., Analytis, James G.

Institutions: Kavli Energy NanoScience Institute, University of California, Berkeley, Lawrence Berkeley National Laboratory

Language: English

Topic: Rare-earth and actinide compounds

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: California Institute of Technology, Multidisciplinary University Research Initiative

Award: G3368950466

OpenAlex ID: W7222623705

Cites: 1

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Related to: 10