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We report measurements of thermal conductivity (κ) as a function of magnetic field in single crystals of the chiral skyrmion material Cu₂OSeO₃ in the temperature range 0.5 K ≤ T ≤ 15 K. Traversing phase boundaries associated with the low-temperature skyrmion and tilted conical spin phases, recently identified in small-angle neutron scattering studies,^a,b gives rise to sharp signatures in κ(H) for H ||〈100〉that are attributed to changes in the magnon thermal conductivity. Different crystallographic orientations for the applied field and heat flow will be discussed.

^a A. Chacon et al., Nature Phys. 14, 936 (2018).

^b F. Qian et al., Sci. Adv. 3, 7323 (2018).