Abstract
By means of time-dependent specific heat experiments, we have studied the long-time electron spin-lattice relaxation mechanisms of three tetranuclear mixed-valence clusters of manganese ions (Mn4Cl, Mn4Ac and Mn4Me), which have the same magnetic core but different ligand molecules, and thus varying anisotropy. The relaxation of the spins towards equilibrium takes place, below 1 K, via an incoherent tunneling mechanism in the magnetic ground doublet, in which process energy is exchanged with the phonon bath. It is shown that the spin-lattice relaxation rate increases when the tunneling probabilities increase, thus indicating that quantum tunneling brings the spins towards equilibrium. For Mn4Me, this fast relaxation enables the magnetic system to undergo a transition to a long-range ordered state below TC=0.21 K.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.