The sample-dependent and sample-independent thermal transport properties of $\alpha$-RuCl${}_3$

Abstract

We investigated the thermal transport properties of two $\alpha$-RuCl${}_3$ crystals with different degrees of stacking disorder to understand the origin of the previously reported oscillatory feature in the field dependence of thermal conductivity. Crystal I shows only one magnetic order around 13\,K, which is near the highest T${}_N$ for $\alpha$-RuCl${}_3$ with stacking faults. Crystal II has less stacking disorder, with a dominant heat capacity at 7.6\,K along with weak anomalies at 10\,K and 13\,K. In the temperature and field dependence of thermal conductivity, no obvious anomaly was observed to be associated with the magnetic order around 13\,K for either crystal or around 10\,K for crystal II. Crystal II, with less disorder, showed clear oscillations in the field dependence of thermal conductivity, while crystal I, with more disorder, did not. For crystal I, an L-shaped region in the temperature-field space was observed where thermal Hall conductivity ${\kappa }_{xy}$/T is within $\pm$20\% of the half quantized thermal Hall conductivity ${\kappa }_{HQ}$/T. While for crystal II, ${\kappa }_{xy}$/T reaches ${\kappa }_{HQ}$/T only in the high field and high temperature regime with no indication of a plateau at ${\kappa }_{HQ}$/T. Our thermal conductivity data suggest the oscillatory features are inherent to the zig-zag ordered phase with T${}_N$ near 7\,K. Our planar thermal Hall effect measurements highlight the sensitivity of this phenomena to stacking disorder. Overall, our results highlight the importance of understanding and controlling crystallographic disorder for obtaining and interpreting intrinsic thermal transport properties in $\alpha$-RuCl${}_3$.

6 pages, 3 figures

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Cited by in corpus (14)

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• Kitaev Quantum Spin Liquids
• Stacking disorder and thermal transport properties of $\alpha$-RuCl${}_3$
• Thermal Hall effects due to topological spin fluctuations in YMnO${}_3$
• Charge-Neutral Electronic Excitations in Quantum Insulators
• Planar thermal Hall effect from phonons in cuprates
• Magnetothermal transport in ultraclean single crystals of Kitaev magnet $\alpha$-RuCl${}_3$
• Multinode quantum spin liquids in extended Kitaev honeycomb models: the view from variational Monte Carlo
• Bulk excitations in ultraclean $\alpha$-RuCl${}_3$: Quantitative evidence for Majorana dispersions in a Kitaev quantum spin liquid
• Anyon polarons as a window into competing phases of the Kitaev honeycomb model under a Zeeman field
• Intermediate phases in $\alpha$-RuCl${}_3$ under in-plane magnetic field via interlayer spin interactions
• Extrinsic contribution to bosonic thermal Hall transport
• Bond disorder in extended Heisenberg-Kitaev models: Spin textures and in-gap states in the high-field regime
• Spin-phonon coupling and thermal Hall effect in the Kitaev model