Alternating-spin-chain compound AgVOAsO${}_4$ probed by ${}^{75}$As NMR

Abstract

${}^{75}$As NMR measurements were performed on a polycrystalline sample of spin-1/2 alternating-spin-chain Heisenberg antiferromagnet AgVOAsO${}_4$. Temperature-dependent NMR shift $K(T)$, 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 $J/k_{\mathrm{B}}\simeq 38.4$ K, alternation ratio $\alpha =J^{\prime }/J\simeq 0.68$, and spin gap $\Delta /k_{\mathrm{B}}\simeq 15$ K. The transferred hyperfine coupling between the ${}^{75}$As nucleus and V${}^{4+}$ spins obtained by comparing the NMR shift with bulk susceptibility amounts to $A_{\mathrm{hf}}\simeq 3.3$ T/${\mu }_{\mathrm{B}}$. Our temperature-dependent spin-lattice relaxation rate $1/T_1(T)$ also shows an activated behaviour at low temperatures, thus confirming the presence of a spin gap in AgVOAsO${}_4$.

6 pages, 5 figures

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