Robust triple-q magnetic order with trainable spin vorticity in Na2Co2TeO6
Abstract
Recent studies suggest that the candidate Kitaev magnet Na2Co2TeO6 possesses novel triple-q magnetic order instead of conventional single-q zigzag order. Here we present dedicated experiments in search for distinct properties expected of the triple-q order, namely, insensitivity of the magnetic domains to weak C3 symmetry-breaking fields and fictitious magnetic fields generated by the spin vorticity. In structurally pristine single crystals, we show that C3 symmetry-breaking in-plane uniaxial strains do not affect the order's magnetic neutron diffraction signals. We further show that c-axis propagating light exhibits large Faraday rotations in the ordered state due to the spin vorticity, the sign of which can be trained via the system's ferrimagnetic moment. These results are in favor of the triple-q order in Na2Co2TeO6 and reveal its unique emerging behavior.
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