Abrupt relaxation in high-spin molecules

Mean-field model suggests that the rate of resonant quantum tunneling in hi gh-spin molecules is not only field-dependent but also time-dependent. The relaxation-assisted resonant tunneling in high-spin molecules produces an a brupt magnetization change during relaxation. When the applied field is ver y close to the resonant field, a time-dependent interaction field gradually shifts the energies of different collective spin states, and magnetization tunneling is observed as two energies of the spin states coincide. (C) 200 0 Elsevier Science B.V. All rights reserved.