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Alternating spin chain compound AgVOAsO4 probed by 75As NMR

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Khuntia,  P.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Ranjith,  K. M.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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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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Baenitz,  M.
Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tsirlin,  A. A.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Ahmed, N., Khuntia, P., Ranjith, K. M., Rosner, H., Baenitz, M., Tsirlin, A. A., et al. (2017). Alternating spin chain compound AgVOAsO4 probed by 75As NMR. Physical Review B, 96(22): 224423, pp. 1-6. doi:10.1103/PhysRevB.96.224423.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002E-9FF7-A
Abstract
As-75 NMR measurements were performed on a polycrystalline sample of spin-1/2 alternating spin chain Heisenberg antiferromagnet AgVOAsO4. The temperature-dependentNMRshiftK(T), which is a direct measure of the intrinsic spin susceptibility, agrees very well with the spin-1/2 alternating-chain model, justifying the assignment of the spin lattice. From the analysis of K(T), magnetic exchange parameters were estimated as follows: the leading exchange J/k(B) similar or equal to 38.4 K and the alternation ratio alpha= J'/J similar or equal to 0.69. The transferred hyperfine coupling between the As-75 nucleus and V4+ spins obtained by comparing the NMR shift with the bulk susceptibility amounts to A(hf) similar or equal to 3.3 T mu B. The effect of interchain couplings on the low-temperature activated behavior of K(T) and the spin-lattice relaxation rate 1/T-1 is identified.