Slow relaxations of Dy(III) single-ion magnets dominated by simultaneous binding of chelating ligands in low-symmetry ligand-fields

Electronic effect and geometry distortion of low-symmetry ligand-field on anisotropy barrier (Ueff) of spin reversal have been compared in three Dy(III) single-ion magnets through simultaneous binding of chelating ligands. The...

Synthesis, structure and properties of [Co(NCS)2(4-(4-chlorobenzyl)pyridine)2]n, that shows slow magnetic relaxations and a metamagnetic transition

[Co(NCS)2(4-(4-chlorobenzyl)pyridine)2]n shows a metamagnetic behavior and slow relaxations of magnetization indicative of a single chain magnet behavior.

ARBITRARILY SLOW RELAXATIONS IN A SPIN-BOSON MODEL UNDER THE NONINTERACTING-BLIP APPROXIMATION

A two-level system coupled to a thermal bath of bosons in the noninteracting-blip approximation, is studied in dependence on the low frequency behavior of the spectral density of the reservoir. The long time evolution of the polarization and the populations exhibits a discontinuity in correspondence of the power four of the super-ohmic regime. By approaching this boundary, the long time inverse power law relaxations become arbitrarily slow. The role of the temperature changes in the transition to powers larger than four, enhancing the amplitude of the long time polarization.