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We have investigated the longitudinal thermal conductivity of $alpha$-RuCl$_{3}$, the magnetic state of which is considered to be proximate to a Kitaev honeycomb model, along with the spin susceptibility and magnetic specific heat. We found that the temperature dependence of the thermal conductivity exhibits an additional peak around 100 K, which is well above the phonon peak temperature ($sim$ 50 K). The higher-temperature peak position is comparable to the temperature scale of the Kitaev couplings rather than the Neel temperatures below 15 K. The additional heat conduction was observed for all five samples used in this study, and was found to be rather immune to a structural phase transition of $alpha$-RuCl$_{3}$, which suggests its different origin from phonons. Combined with experimental results of the magnetic specific heat, our transport measurement suggests strongly that the higher-temperature peak in the thermal conductivity is attributed to itinerant spin excitations associated with the Kitaev couplings of $alpha$-RuCl$_{3}$. A kinetic approximation of the magnetic thermal conductivity yields a mean free path of $sim$ 20 nm at 100 K, which is well longer than the nearest Ru-Ru distance ($sim$ 3 AA), suggesting the long-distance coherent propagation of magnetic excitations driven by the Kitaev couplings.
We report on the unusual behavior of the in-plane thermal conductivity ($kappa$) and torque ($tau$) response in the Kitaev-Heisenberg material $alpha$-RuCl$_3$. $kappa$ shows a striking enhancement with linear growth beyond H = 7 T, where magnetic or
The Kitaev quantum spin liquid displays the fractionalization of quantum spins into Majorana fermions. The emergent Majorana edge current is predicted to manifest itself in the form of a finite thermal Hall effect, a feature commonly discussed in top
We have investigated the sample dependence of the half-integer thermal Hall effect in $alpha$-RuCl$_3$ under a magnetic field tilted 45 degree from the $c$ axis to the $a$ axis. We find that the sample with the largest longitudinal thermal conductivi
$alpha$-RuCl$_{3}$ is a major candidate for the realization of the Kitaev quantum spin liquid, but its zigzag antiferromagnetic order at low temperatures indicates deviations from the Kitaev model. We have quantified the spin Hamiltonian of $alpha$-R
Magnetic properties of the substitution series Ru$_{1-x}$Cr$_x$Cl$_3$ were investigated to determine the evolution from the anisotropic Kitaev magnet $alpha$-RuCl$_3$ with $J_{rm eff} = 1/2$ magnetic Ru$^{3+}$ ions to the isotropic Heisenberg magnet