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Modern theories of quantum magnetism predict exotic multipolar states inweakly interacting strongly frustrated spin-1/2 Heisenberg chains withferromagnetic nearest neighbor (NN) inchain exchange in high magnetic fields.Experimentally these states remained elusive so far. Here we report theevidence for a long-sought magnetic field-induced nematic state arising above afield of $\sim 13$ T in the edge-sharing chain cuprate LiSbCuO$_4$ $\equiv$LiCuSbO$_4$. This interpretation is based on the observation of a field inducedspin-gap in the measurements of the $^7$Li NMR spin relaxation rate $T_1^{-1}$as well as a contrasting field-dependent power-law behavior of $T_1^{-1}$ vs.$T$ and is further supported by static magnetization and ESR data. Anunderlying theoretical microscopic approach favoring a nematic scenario isbased essentially on the NN XYZ exchange anisotropy within a model forfrustrated spin-1/2 chains. It is investigated by the DMRG technique. Theemployed exchange parameters are justified qualitatively by electronicstructure calculations for LiCuSbO$_4$.

Evidence for a magnetic field-induced unconventional nematic state in the frustrated and anisotropic spin-chain cuprate LiCuSbO$_4$