Relaxation rates of magnetization in LiYF4:Ho3+ crystals

Manifestation of the anticrossing of energy levels in EPR spectra of spin clusters

“…The matrix of spin Hamiltonian (2) in the singlet-triplet basis can be written as (3) I assume that the relation |D zz /2 + b z | ≫ b x is fulfilled and thus the impurity of the state T + in the state T 0 can be neglected. The dependence of the energy levels on the magnetic field H 0 is shown in Fig.…”

“…Many of them, e.g., magnetization tunneling, are related to the Landau-Zener effect and occur at a fast passage of the anticrossing region (see, e.g., [1]). Some effects are associated with a change in the relaxation rate in the vicinity of the anticrossing and other reasons (see, e.g., [2][3][4]). In this work, I disregard the features that can occur at fast passage and dwell only on the analysis of slow passage of the anticrossing region.…”