A μSR search for magnetism in the cluster compound Nb6F15

We report zero and longitudinal field studies seeking evidence of magnetism at low temperature in the cluster compound Nb6F15, which consists of a cubic lattice of Nb6 octahedra with a single unpaired electron per octahedron. We find characteristic FμF oscillations, but they exhibit no perturbation (e.g. due to magnetic ordering) down to 3 K. The implications are discussed in comparison with results from NMR and other techniques, where evidence of antiferromagnetism has been found at low temperature.