  In a one-dimensional (1D) system with degenerate ground states, their domain
boundaries, dubbed solitons, emerge as topological excitations often carrying
unconventional charges and spins; however, the soliton excitations are only
vital in the non-ordered 1D regime. Then a question arises; how do the solitons
conform to a 3D ordered state? Here, using a quasi-1D organic ferroelectric,
TTF-CA, with degenerate polar dimers, we pursue the fate of a spin-soliton
charge-soliton composite matter in a 1D polar-dimer liquid upon its transition
to a 3D ferroelectric order by resistivity, NMR and NQR measurements. We
demonstrate that the soliton matter undergoes neutral spin-spin soliton pairing
and spin-charge soliton pairing to form polarons, coping with the 3D order. The
former contributes to the magnetism through triplet excitations whereas the
latter carries electrical current. Our results reveal the whole picture of a
soliton matter that condenses into the 3D ordered state.
