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Keywords:

  • 03.65.Yz;
  • 03.67.–a;
  • 75.45.+j;
  • 85.35.–p

Abstract

Starting from the observation that at very low temperatures an isolated nanomagnet can be treated as an effective two-state system, we introduce a model to study quantum tunnelling and decoherence phenomena. We assume that the total spin of the magnet interacts with a spin bath. We show that depending upon the interaction strengths the molecule can exhibit tunnelling with or without decoherence. We also investigate the case where the spin-spin interaction is mediated by phonons. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)