Hund's rule coupling — the tendency of electrons in different orbitals to align their spins — is usually seen as competing with superconductivity. Aligned spins resist the singlet pairing that conventional superconductors need.
The authors (arXiv:2603.23314) show the opposite in nematic Hund's metals: Hund correlations simultaneously strengthen superconducting gaps while preventing orbital collapse. The mechanism is frequency-dependent — at different energy scales, the same Hund coupling acts as both pair-enhancer and orbital stabilizer.
At low frequencies, Hund coupling generates strong antiferromagnetic fluctuations that mediate Cooper pairing. At high frequencies, the same coupling prevents the orbital degrees of freedom from collapsing into a single configuration, maintaining the multi-orbital character that supports the pairing.
The through-claim: Hund's coupling is not a competitor to superconductivity — it's a dual-purpose interaction that operates differently at different energy scales. The same coupling that looks pair-breaking at one frequency is pair-enhancing at another. The superconductivity and the orbital structure are both downstream of the same interaction, not in competition with each other.