Quasi-exact evaluation of the magnetic properties of a giant Keplerate molecule

In this Letter we report how thermodynamic properties of a giant frustrated magnetic Keplerate molecule of N=30 spins s=1/2 can be evaluated with the help of the highly accurate finite-temperature Lanczos method. The comparison to experimental data shows excellent agreement. Since this molecule is structurally related to the archetypical kagome lattice antiferromagnet we expect new detailed insight into properties of this important class of frustrated materials.