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The honeycomb Kitaev-Heisenberg model is a source of a quantum spin liquidwith Majorana fermions and gauge flux excitations as fractional quasiparticles.In the quest of finding a pertinent material, $\alpha$-RuCl$_{3}$ recentlyemerged as a prime candidate. Here we unveil highly unusual low-temperatureheat conductivity $\kappa$ of $\alpha$-RuCl$_{3}$: beyond a magnetic field of$B_c\approx$ 7.5 T, $\kappa$ increases by about one order of magnitude,resulting in a large magnetic field dependent peak at about 7 K, both forin-plane as well as out-of-plane transport. This clarifies the unusual magneticfield dependence unambiguously to be the result of severe scattering of phononsoff putative Kitaev-Heisenberg excitations in combination with a drasticfield-induced change of the magnetic excitation spectrum. In particular, anunexpectedly large energy gap arises, which increases approximately linearlywith the magnetic field and reaches a remarkably large$\hbar\omega_0/k_B\approx $ 50 K at 18 T.

Large field-induced gap of Kitaev-Heisenberg paramagnons in $\alpha$-RuCl$_{3}$