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Magnetization measurements of a truly axial symmetry Mn12-tBuAc molecularnanomagnet with a spin ground state of S = 10 show resonance tunneling. Thiscompound has the same magnetic anisotropy as Mn12-Ac but the molecules arebetter isolated and the crystals have less disorder and a higher symmetry.Hysteresis loop measurements at several temperatures reveal a well-resolvedstep fine-structure which is due to level crossings of excited states. All steppositions can be modeled by a simple spin Hamiltonian. The crossover betweenthermally assisted and pure quantum tunneling can be investigated withunprecedented detail.Comment: 5 pages, 6 figure

physical review letters

Resonant Tunneling in Truly Axial Symmetry<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Mn</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:math>Single-Molecule Magnets: Sharp Crossover between Thermally Assisted and Pure Quantum Tunneling

Resonant Tunneling in Truly Axial SymmetryMn12Single-Molecule Magnets: Sharp Crossover between Thermally Assisted and Pure Quantum Tunneling