Magnetic properties of V-jarosite AV3(SO4)2(OH)6 (A=Na,K) with kagome lattice

We have newly synthesized V-jarosite, NaV3(SO4)2(OH)6 and KV3(SO4)2(OH)6, with kagome lattice using the hydrothermal reaction method. Structural parameters were refined by powder X-ray diffraction. It was found that these compounds show a ferromagnetic behavior below 50 K and that the field dependence of magnetization has no hysteresis. Thus, it can be concluded that magnetic interactions of intralayer are ferromagnetic and those of interlayer are antiferromagnetic. Results of 23Na NMR also will be presented in this report