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Single‐Molecule Magnets DyM 2 N@C 80 and Dy 2 MN@C 80 (M=Sc, Lu): The Impact of Diamagnetic Metals on Dy 3+ Magnetic Anisotropy, Dy⋅⋅⋅Dy Coupling, and Mixing of Molecular and Lattice Vibrations
Author(s) -
Spree Lukas,
Schlesier Christin,
Kostanyan Aram,
Westerström Rasmus,
Greber Thomas,
Büchner Bernd,
Avdoshenko Stanislav M.,
Popov Alexey A.
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904879
Subject(s) - dysprosium , lutetium , diamagnetism , magnetization , antiferromagnetism , crystallography , magnetic moment , lattice constant , condensed matter physics , chemistry , materials science , yttrium , physics , inorganic chemistry , oxide , magnetic field , diffraction , organic chemistry , quantum mechanics , optics
The substitution of scandium in fullerene single‐molecule magnets (SMMs) DySc 2 N@C 80 and Dy 2 ScN@C 80 by lutetium has been studied to explore the influence of the diamagnetic metal on the SMM performance of dysprosium nitride clusterfullerenes. The use of lutetium led to an improved SMM performance of DyLu 2 N@C 80 , which shows a higher blocking temperature of magnetization ( T B =9.5 K), longer relaxation times, and broader hysteresis than DySc 2 N@C 80 ( T B =6.9 K). At the same time, Dy 2 LuN@C 80 was found to have a similar blocking temperature of magnetization to Dy 2 ScN@C 80 ( T B =8 K), but substantially different interactions between the magnetic moments of the dysprosium ions in the Dy 2 MN clusters. Surprisingly, although the intramolecular dipolar interactions in Dy 2 LuN@C 80 and Dy 2 ScN@C 80 are of similar strength, the exchange interactions in Dy 2 LuN@C 80 are close to zero. Analysis of the low‐frequency molecular and lattice vibrations showed strong mixing of the lattice modes and endohedral cluster librations in k ‐space. This mixing simplifies the spin–lattice relaxation by conserving the momentum during the spin flip and helping to distribute the moment and energy further into the lattice.