Magnetic long-range order induced by quantum relaxation in single-molecule magnets

Abstract

Can magnetic interactions between single-molecule magnets (SMMs) in a crystal establish long-range magnetic order at low temperatures deep in the quantum regime, where the only electron spin-fluctuations are due to incoherent magnetic quantum tunneling (MQT)? Put inversely: can MQT provide the temperature dependent fluctuations needed to destroy the ordered state above some finite Tc, although it should basically itself be a T-independent process? Our experiments on two novel Mn4 SMMs provide a positive answer to the above, showing at the same time that MQT in the SMMs has to involve spin-lattice coupling at a relaxation rate equaling that predicted and observed recently for nuclear spin-mediated quantum relaxation.

4 pages, 3 figures

Cited by in corpus (5)

• Spin-enhanced magnetocaloric effect in molecular nanomagnets
• Nuclear spin dynamics in the quantum regime of a single-molecule magnet
• Magnetic dipolar ordering and relaxation in the high-spin molecular cluster compound Mn6
• Giant isotope effect in the incoherent tunneling specific heat of the molecular nanomagnet Fe8
• Effect of dipolar interactions on the magnetization of a cubic array of nanomagnets