Incoherent Landau-Zener-Stuckelberg Transitions in Single-Molecule Magnets
arXiv:0811.0010 · doi:10.1103/PhysRevB.79.104423
Abstract
It is shown that in experiments on single molecule magnets (SMM's) in which transitions between two lowest spin states are induced by sweeping the applied magnetic field along the easy axis, the transitions are fully incoherent. Nuclear spins and the dipolar coupling of molecular spins are identified as the main sources of decoherence, and the form of the decoherence is calculated. The Landau-Zener-Stuckelberg (LZS) process is examined in light of this decoherence, and it is shown that the correct formula for the spin-flip probability is better given by a more recent formula of Kayanuma's than that of LZS. The two formulas are shown to be identical in the limit of rapid sweeps. An approximate way of incorporating the molecular spin dipole field into the rate equations for this process is developed.
arXiv commentVersion 2. References updated, and new commentary on slow and ultra-slow LZS sweeps
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- Intermolecular mechanism for multiple maxima in molecular dynamic susceptibility
- Adiabatic theorems for linear and nonlinear Hamiltonians
- Observation of coherent oscillation in single-passage Landau-Zener transitions
- Tunneling and inversion symmetry in single-molecule magnets: the case of the Mn12 wheel molecule
- Low-Temperature Magnetization Relaxation in Magnetic Molecular Solids
- Dynamic Symmetries and Quantum Nonadiabatic Transitions
- Low-Temperature Magnetization Dynamics of Magnetic Molecular Solids in a Swept Field
- Phonoemissive Spin Tunneling in Molecular Nanomagnets
- Oscillator bath simulation of the spin bath