Thermal Transport of Fractionalized Antiferromagnetic and Field Induced States in the Kitaev Material Na${}_2$Co${}_2$TeO${}_6$

Abstract

We report an in-plane thermal transport study of the honeycomb Kitaev material Na${}_2$Co${}_2$TeO${}_6$ at subKelvin temperatures. In zero field, the $\kappa (T)$ displays a rather weak $T$-dependence but has a non-zero residual term ${\kappa }_0/T$, indicating strong phonon scattering by magnetic excitation and the possibility of itinerant spinon-like excitations coexisting with an antiferromagnetic order below 27 K. We propose the zero-field ground state is a novel fractionalized antiferromagnetic (AF*) state with both magnetic order and fractionalized excitations. With both the heat current and external field along the $a\ast$ (Co-Co bond) direction, the ${\kappa }_{a\ast }$ exhibits two sharp minima at 7.5 T and 10 T, and its value at 8.5 T is almost the same as the pure phononic transport for the high-field polarized state. This confirms the phase boundaries of the reported field-induced intermediate state and suggest its gapless continuum excitations possibly transport heat. No such intermediate phase was found in the ${\kappa }_a$ for the current and field along the $a$ (zigzag chain) direction. Finally, Na${}_2$Co${}_2$TeO${}_6$ displays a strongly anisotropic magneto-thermal conductivity since the in-plane (out-of-plane) field strongly enhances (suppresses) the ${\kappa }_{a\ast }$ and ${\kappa }_a$.

7 pages, 3 figures

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• Proximate Dirac spin liquid in honeycomb lattice $J_1$-$J_3$ XXZ model: Numerical study and application to cobaltates
• Ising-type quantum spin liquid state in PrMgAl${}_{11}$O${}_{19}$
• Field and Polarization Dependent Quantum Spin Dynamics in Honeycomb Magnet Na${}_2$Co${}_2$TeO${}_6$: Magnetic Excitations and Continuum
• Persistent spin dynamics in magnetically ordered honeycomb cobalt oxides
• Advances in honeycomb layered oxides: Part I -- Syntheses and Characterisations of Pnictogen- and Chalcogen-Based Honeycomb Layered Oxides
• Topological phase transitions and thermal Hall effect in a noncollinear spin texture
• Chiral spin state and nematic ferromagnet in the spin-1 Kitaev-$\Gamma$ model
• High Chern numbers and topological flat bands in high-field polarized Kitaev magnets on the star lattice
• Anisotropic in-plane heat transport of Kitaev magnet Na${}_2$Co${}_2$TeO${}_6$
• Itinerant and topological excitations in a honeycomb spiral spin liquid candidate
• Anisotropic magnetoelastic coupling in the honeycomb magnet Na${}_3$Co${}_2$SbO${}_6$