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Subject: Quantum fluids and solids ×

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    Dimensional reduction and incommensurate dynamic correlations in the S=1/2 triangular-lattice antiferromagnet Ca3ReO5Cl2
    ([London] : Nature Publishing Group UK, 2022) Zvyagin, S.A.; Ponomaryov, A.N.; Wosnitza, J.; Hirai, D.; Hiroi, Z.; Gen, M.; Kohama, Y.; Matsuo, A.; Matsuda, Y.H.; Kindo, K.
    The observation of spinon excitations in the S=1/2 triangular antiferromagnet Ca3ReO5Cl2 reveals a quasi-one-dimensional (1D) nature of magnetic correlations, in spite of the nominally 2D magnetic structure. This phenomenon is known as frustration-induced dimensional reduction. Here, we present high-field electron spin resonance spectroscopy and magnetization studies of Ca3ReO5Cl2, allowing us not only to refine spin-Hamiltonian parameters, but also to investigate peculiarities of its low-energy spin dynamics. We argue that the presence of the uniform Dzyaloshinskii-Moriya interaction (DMI) shifts the spinon continuum in momentum space and, as a result, opens a zero-field gap at the Γ point. We observed this gap directly. The shift is found to be consistent with the structural modulation in the ordered state, suggesting this material as a perfect model triangular-lattice system, where a pure DMI-spiral ground state can be realized.
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    Signatures of a magnetic field-induced unconventional nematic liquid in the frustrated and anisotropic spin-chain cuprate LiCuSbO4
    (London : Nature Publishing Group, 2017) Grafe, H.-J.; Nishimoto, S.; Iakovleva, M.; Vavilova, E.; Spillecke, L.; Alfonsov, A.; Sturza, M.-I.; Wurmehl, S.; Nojiri, H.; Rosner, H.; Richter, J.; Rößler, U.K.; Drechsler, S.-L.; Kataev, V.; Büchner, B.
    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 ~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 7Li NMR spin relaxation rate T1−1 as well as a contrasting field-dependent power-law behavior of T1−1 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.