The effects of external pressure on a high-performing dysprosocenium single-molecule magnet are investigated using a combination of X-ray diffraction, magnetometry and theoretical calculations. The effective energy barrier () decreases from 1300 cm at ambient pressure to 1125 cm at 3 GPa. Our results indicate that compression < 1.2 GPa has a negligible effect on the Orbach process, but magnetic relaxation > 1 GPa increases Raman relaxation and/or quantum tunnelling of magnetisation.
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http://dx.doi.org/10.1039/d2cc06722f | DOI Listing |
Dalton Trans
December 2024
Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
Chem Commun (Camb)
November 2024
Department of Chemistry, The University of Manchester, Manchester, M13 9PL, UK.
Developing molecular spin technologies requires microscopic knowledge of their spin-dynamics. Calculation of phonon modes, phonon scattering and spin-phonon coupling for a dysprosocenium single-molecule magnet (SMM) give simulations of spin-dynamics that agree with experiment. They show that low-energy phonon scattering is a significant contribution to the high-performance of dysprosocenium SMMs.
View Article and Find Full Text PDFPhys Chem Chem Phys
June 2024
Department of Chemistry, The University of Manchester, Manchester M13 9PL, UK.
Dy(III) bis-cyclopentadienyl (Cp) sandwich compounds exhibit extremely strong single-ion magnetic anisotropy which imbues them with magnetic memory effects such as magnetic hysteresis, and has put them at the forefront of high-performance single-molecule magnets (SMMs). Owing to the great success of design principles focused on maximising the anisotropy barrier, ever higher values have been reported leading to significant slow down of single-phonon Orbach spin relaxation. However, anisotropy-based SMM design has largely ignored two-phonon Raman spin relaxation, which is still limiting the temperatures at which a memory effect can be observed.
View Article and Find Full Text PDFInorg Chem
May 2024
Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
The decamethyldysprosocenium cation, [Dy(Cp*)] (Cp* = {CMe}), was a target single-molecule magnet (SMM) prior to the isolation of larger dysprosocenium cations, which have recently shown magnetic memory effects up to 80 K. However, the relatively short Dy···Cp* distances of [Dy(Cp*)], together with the reduced resonance of its vibrational modes with electronic states compared to larger dysprosocenium cations, could lead to more favorable SMM behavior. Here, we report the synthesis and magnetic properties of a series of solvated adducts containing bis-halobenzene decamethyldysprosocenium cations, namely [Dy(Cp*)(PhX-κ-)][Al{OC(CF)}] (X = F or Cl) and [Dy(Cp*)(CHF-κ-,)(CHF-κ-)][Al{OC(CF)}].
View Article and Find Full Text PDFInorg Chem
May 2024
Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
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