Landau-Zener tunneling with many-body quantum effects in crystals of molecular magnets

Li-Bin Fu; Shi-Gang Chen; Bambi Hu

doi:10.1016/j.physleta.2004.02.015

paper

Landau-Zener tunneling with many-body quantum effects in crystals of molecular magnets

arXiv:cond-mat/0403395 · doi:10.1016/j.physleta.2004.02.015

Abstract

We present a quantum interpretation of the heights in hysteresis of $F e_{8}$ molecule at lower temperatures by treating the crystal as an Ising spin system with the dipolar interaction between spins. Then we apply it to two limit cases : rapid and adiabatic regions. Our theoretical analysis is in agreement with the experimental observation in these regions, which indicates that the steps in hysteresis loops of magnetization of Fe $_{8}$ at lower temperatures show a pure quantum process.

4 pages, 3 figures