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The structural and magnetic properties of the geometrically frustratedspin-$1/2$ capped-kagome antiferromagnet (RbCl)Cu$_{5}$P$_{2}$O$_{10}$ areinvestigated via temperature dependent x-ray diffraction, magnetization, heatcapacity, and $^{31}$P NMR experiments on a polycrystalline sample. Itundergoes a structural transition at around $T_{\rm t} \simeq 310$ K from ahigh temperature trigonal ($P\bar{3}m1$) to a low temperature monoclinic($C2/c$) unit cell, where the low temperature structure features thecapped-kagome geometry of Cu$^{2+}$ ions. Interestingly, it shows the onset oftwo successive magnetic transitions at $T_{\rm N1} \simeq 20$ K and $T_{\rm N2}\simeq 7$ K. The shape of the $^{31}$P NMR spectra unfold the possible natureof the transitions below $T_{\rm N1}$ and $T_{\rm N2}$ to be of incommensurateand commensurate antiferromagnetic type, respectively. A large value of theCurie-Weiss temperature as compared to $T_{\rm N1}$ sets the frustrationparameter $f \simeq 8$, ensuring strong magnetic frustration in the compound.From the $^{31}$P NMR spin-lattice relaxation rate, the leadingantiferromagnetic exchange coupling is estimated to be $J/k_{\rm B} \simeq 117$K. These unusual double magnetic transitions make this compound beguiling forfurther investigations.

Structural and double magnetic transitions in the frustrated spin-$\frac{1}{2}$ capped-kagome antiferromagnet (RbCl)Cu$_{5}$P$_{2}$O$_{10}$