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Magnetization measurements of a molecular clusters Mn12 with a spin groundstate of S = 10 show resonance tunneling at avoided energy level crossings. Theobserved oscillations of the tunnel probability as a function of the magneticfield applied along the hard anisotropy axis are due to topological quantumphase interference of two tunnel paths of opposite windings. Mn12 is thereforethe second molecular clusters presenting quantum phase interference.Comment: 3 pages, 4 figures, MMM'01 conference (12-16 Nov.

Quantum phase interference (Berry phase) in single-molecule magnets of [Mn12]2−