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The magnetic properties and spin dynamics of the spin frustratedpolyoxometalate {W72V30}, where 30 V^{4+} ions (s = 1/2) occupy the sites of anicosidodecahedron, have been investigated by low temperature magnetization,magnetic susceptibility, proton and vanadium nuclear magnetic resonance, andtheoretical studies. The field-dependent magnetization at 0.5 K increasesmonotonically up to 50 T without any sign of staircase behavior. Thislow-temperature behavior cannot be explained by a Heisenberg model based on asingle value of the nearest-neighbor exchange coupling. We analyze thisbehavior upon assuming a rather broad distribution of nearest-neighbor exchangeinteractions. Slow spin dynamics of {W72V30} at low temperatures is observedfrom the magnetic field and temperature dependence of nuclear spin-latticerelaxation rate 1/T_1 measurements.

Exchange randomness and spin dynamics in the frustrated magnetic Keplerate {W72V30}