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The nature of unconventional charge density wave in kagome metals is currently under intense debate. Here the authors report the coexistence of the 2 × 2 × 1 charge density wave in the kagome sublattice and the Sb 5p-electron assisted 2 × 2 × 2 charge density waves in CsV₃Sb₅.

Finite momentum superconducting pairing refers to a class of unconventional superconducting states where Cooper pairs acquire a non-zero momentum. Here the authors report a new superconducting state in bulk 4Hb-TaS₂, where magnetic fields induce finite momentum pairing via magnetoelectric coupling.

The understanding of charge density wave (CDW) correlations in cuprate superconductors remains hampered due to the lack of scattering phase information. Here, Chen et al. discover a reproducible CDW domain memory effect upon repeated cycling to temperatures well above the CDW ordering temperature.

Honeycomb lattices of divalent, high-spin Co ions are predicted to host dominant Kitaev exchange interactions expanding opportunities to realize the elusive Kitaev Quantum Spin Liquid (KQSL) state. Hydrostatic pressure studies on leading candidate material Na₃Co₂SbO₆ revealed a transition into a low-spin Co state, quenching the orbital degrees of freedom necessary to realize a KQSL state, but leading to possible emergence of quantum paramagnetism in the compressed honeycomb lattice of S=1/2 divalent Co ions.

The interplay between magnetism and charge density wave in the kagome magnet FeGe is under debate. By using elastic and inelastic X-ray scattering, angle-resolved photoemission spectroscopy, and first principles calculations, Miao et al. propose that the charge density wave is stabilized by spin-phonon coupling.

We establish a spin nematic phase in the square-lattice iridate Sr₂IrO₄ and find a complete breakdown of coherent magnon excitations at short-wavelength scales, suggesting a many-body quantum entanglement in the antiferromagnetic state.

Kitaev quantum spin liquids are an exciting potential platform for hosting rich condensed matter physics. Here, the authors characterize the most promising material candidate, the honeycomb iridate H₃LiIr₂O₆ and reveal a broad continuum of collective excitations absent of a momentum dependence–suggestive of a disordered topological spin liquid.

Antiferromagnetic excitonic insulators are a distinct form of excitonic insulator, in which electrons and holes are bound by magnetic exchange rather than Coulomb attraction. Here, Mazzone et al. show, using X-ray scattering, that Sr3Ir2O7 realizes this particular state.

It was recently proposed that the coupling between phonons and fractional excitations of a Kitaev quantum spin liquid can be detected in its phonon dynamics. Here, the authors report signatures of this coupling, manifested in low-energy phonon anomalies measured by inelastic X-ray scattering with meV resolution.