Signatures of a magnetic field-induced unconventional nematic liquid in the 
frustrated and anisotropic spin-chain cuprate LiCuSbO4

Grafe, H. -J.; Nishimoto, S.; Iakovleva, M.; Vavilova, E.; Spillecke, L.; Alfonsov, A.; Sturza, M. -I.; Wurmehl, S.; Nojiri, H.; Rosner, H.; Richter, J.; Roessler, U. K.; Drechsler, S. -L.; Kataev, V.; Buechner, B.

doi:10.1038/s41598-017-06525-0

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Signatures of a magnetic field-induced unconventional nematic liquid in the frustrated and anisotropic spin-chain cuprate LiCuSbO₄

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Rosner, H.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Grafe, H.-.-J., Nishimoto, S., Iakovleva, M., Vavilova, E., Spillecke, L., Alfonsov, A., et al. (2017). Signatures of a magnetic field-induced unconventional nematic liquid in the frustrated and anisotropic spin-chain cuprate LiCuSbO₄. Scientific Reports, 7: 6720, pp. 1-16. doi:10.1038/s41598-017-06525-0.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-CA73-A

Abstract

Modern theories of quantum magnetism predict exotic multipolar states in weakly interacting strongly frustrated spin-1/2 Heisenberg chains with ferromagnetic nearest neighbor (NN) inchain exchange in high magnetic fields. Experimentally these states remained elusive so far. Here we report strong indications of a magnetic field-induced nematic liquid arising above a field of similar to 13 T in the edge-sharing chain cuprate LiSbCuO4 = LiCuSbO4. This interpretation is based on the observation of a field induced spin-gap in the measurements of the Li-7 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. An underlying theoretical microscopic approach favoring a nematic scenario is based essentially on the NN XYZ exchange anisotropy within a model for frustrated spin-1/2 chains and is investigated by the DMRG technique. The employed exchange parameters are justified qualitatively by electronic structure calculations for LiCuSbO4.