Singlet ground state in the alternating spin-$1/2$ chain compound NaVOAsO${}_4$

Abstract

We present the synthesis and a detailed investigation of structural and magnetic properties of polycrystalline NaVOAsO${}_4$ by means of x-ray diffraction, magnetization, electron spin resonance (ESR), and ${}^{75}$As nuclear magnetic resonance (NMR) measurements as well as density-functional band structure calculations. Temperature-dependent magnetic susceptibility, ESR intensity, and NMR line shift could be described well using an alternating spin-$1/2$ chain model with the exchange coupling $J/k_{\mathrm{B}}\simeq 52$ K and an alternation parameter $\alpha \simeq 0.65$. From the high-field magnetic isotherm measured at $T=1.5$ K, the critical field of the gap closing is found to be $H_{\mathrm{c}}\simeq 16$ T, which corresponds to the zero-field spin gap of ${\Delta }_0/k_{\mathrm{B}}\simeq 21.4$ K. Both NMR shift and spin-lattice relaxation rate show an activated behavior at low temperatures, further confirming the singlet ground state. The spin chains do not coincide with the structural chains, whereas the couplings between the spin chains are frustrated. Because of a relatively small spin gap, NaVOAsO${}_4$ is a promising compound for further experimental studies under high magnetic fields.

arXiv comment14 pages, 10 figures, 2 tables

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• Diluting a triangular-lattice spin liquid: Synthesis and characterization of NaYb${}_{1-x}$Lu${}_x$S${}_2$ single crystals
• Two types of alternating spin-$\frac{1}{2}$ chains and their field-induced transitions in $\epsilon$-LiVOPO${}_4$
• One-dimensional magnetism in synthetic Pauflerite, $\beta$-VOSO${}_4$
• Quantum magnetism of ferromagnetic spin dimers in $\alpha$-KVOPO${}_4$
• Inter-chain Interactions, Multi-magnon condensation and Strain effect in chain compound NaVOPO${}_4$