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arXiv · 2610.27663

Lattice symmetry breaking and strain control of single-$\mathbf{q}$ magnetism in Na$_3$Co$_2$SbO$_6$

Yuchen Gu·Wu Xie·Xintong Li·Junhong Liu·Xianghong Jin·Dmitry Khalyavin·Fabio Orlandi·Pascal Manuel·Ping Miao·Yuan Li
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Abstract

Distinguishing single-$\mathbf{q}$ from multi-$\mathbf{q}$ magnetism constrains microscopic spin Hamiltonians. Here we determine the ground state of the candidate Kitaev magnet Na$_3$Co$_2$SbO$_6$ through its coupling to the lattice. High-resolution neutron diffraction reveals a spontaneous monoclinic-to-triclinic distortion at the magnetic transition, in contrast to the absence of detectable lattice-symmetry breaking in triple-$\mathbf{q}$ Na$_2$Co$_2$TeO$_6$. Together with strain-selective magnetic responses, this identifies single-$\mathbf{q}$ order in Na$_3$Co$_2$SbO$_6$ over the proposed symmetry-preserving double-$\mathbf{q}$ state. Uniaxial compression along a low-symmetry in-plane direction achieves the domain selection that magnetic-field training could not, revealing the intrinsic field-induced phase boundaries of the dominant domain. These results establish strain as a symmetry-conjugate field for magnetic domains and highlight magnetoelastic coupling as a route to diagnose, manipulate, and potentially tune magnetic states.

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Yuchen Gu, Wu Xie, Xintong Li, Junhong Liu, Xianghong Jin, Dmitry Khalyavin, Fabio Orlandi, Pascal Manuel, Ping Miao, Yuan Li. 2026-10-20. Lattice symmetry breaking and strain control of single-$\mathbf{q}$ magnetism in Na$_3$Co$_2$SbO$_6$. https://arxiv.org/abs/2610.27663

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