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The layered {\beta}-NaMnO2, a promising Na-ion energy-storage material hasbeen investigated for its triangular lattice capability to promote complexmagnetic configurations that may release symmetry restrictions for thecoexistence of ferroelectric and magnetic orders. The complexity of the neutronpowder diffraction patterns underlines that the routinely adopted commensuratestructural models are inadequate. Instead, a single-phase superspace symmetrydescription is necessary, demonstrating that the material crystallizes in acompositionally modulated q= (0.077(1), 0, 0) structure. Here, Mn3+ Jahn-Tellerdistorted MnO6 octahedra form corrugated layer stacking sequences of the{\beta}-NaMnO2 type, which are interrupted by flat sheets of the {\alpha}-likeoxygen topology. Spontaneous long-range collinear antiferromagnetic order,defined by the propagation vector k= (1/2, 1/2, 1/2), appears below TN1= 200 K.Moreover, a second transition into a spatially modulated proper-screw magneticstate (k+-q) is established at TN2= 95 K, with an antiferromagnetic orderparameter resembling that of a two-dimensional (2D) system. The evolution of23Na NMR spin-lattice relaxation identifies a magnetically inhomogene-ous statein the intermediate T-region (TN2 <T< TN1), while its strong suppression belowTN2 indicates that a spin-gap opens in the excitation spectrum. High-resolutionneutron inelastic scattering confirms that the magnetic dynamics are indeedgapped ({\Delta}~5 meV) in the low-temperature magnetic phase, whilesimulations on the basis of the single-mode approximation suggest that Mn-spinsresiding on ad-jacent antiferromagnetic chains, establish sizable 2Dcorrelations. Our analysis points that novel struc-tural degrees of freedompromote, cooperative magnetism and emerging dielectric properties in thisnon-perovskite-type of manganite.

Incommensurate atomic and magnetic modulations in the spin-frustrated {\beta}-NaMnO2 triangular lattice