Low-temperature phonoemissive tunneling rates in single molecule magnets

Yun Liu, Anupam Garg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Tunneling between the two lowest energy levels of single molecule magnets with Ising type anisotropy, accompanied by the emission or absorption of phonons, is considered. Quantitatively accurate calculations of the rates for such tunneling are performed for a model Hamiltonian especially relevant to the best studied example, Fe8. Two different methods are used: high-order perturbation theory in the spin-phonon interaction and the non-Ising-symmetric parts of the spin Hamiltonian, and a novel semiclassical approach based on spin-coherent-state-path-integral instantons. The methods are found to be in good quantitative agreement with other, and consistent with previous approaches to the problem. The implications of these results for magnetization of molecular solids of these molecules are discussed briefly.

Original languageEnglish (US)
Pages (from-to)76-101
Number of pages26
JournalAnnals of Physics
Volume366
DOIs
StatePublished - Mar 1 2016

Keywords

  • Instanton
  • Molecular magnet
  • Perturbation theory
  • Phonoemissive tunneling
  • Spin-phonon interaction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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