@article{10902/16264,
year = {2014},
month = {8},
url = {http://hdl.handle.net/10902/16264},
abstract = {New {TbCu3} and {DyCu3} single-molecule magnets (SMMs) containing a low-symmetry LnIII center (shape measurements relative to a trigonal dodecahedron and biaugmented trigonal prism are 2.2-2.3) surrounded by three CuII metalloligands are reported. SMM behavior is confirmed by frequency-dependent out-of-phase ac susceptibility signals and single-crystal temperature and sweep rate dependent hysteresis loops. The ferromagnetic exchange interactions between the central LnIII ion and the three CuII ions could be accurately measured by inelastic neutron scattering (INS) spectroscopy and modeled effectively. The excitations observed by INS correspond to flipping of CuII spins and appear at energies similar to the thermodynamic barrier for relaxation of the magnetization, ∼15-20 K, and are thus at the origin of the SMM behavior. The magnetic quantum number Mtot of the cluster ground state of {DyCu3} is an integer, whereas it is a half-integer for {TbCu3}, which explains their vastly different quantum tunneling of the magnetization behavior despite similar},
organization = {The research leading to these results has received funding from
the UK Engineering and Physical Sciences Research Council
(grant ref EP/I027203/1) and the European Community’s
Seventh Framework Programme (FP7/2007-2013) under grant
agreement No. 290605 (PSI-FELLOW/COFUND). This work
is partially based on experiments performed at the Swiss
spallation neutron source SINQ, Paul Scherrer Institute, Villigen,
Switzerland.},
publisher = {American Chemical Society},
publisher = {Inorganic Chemistry, 2014, 53, 8970-8978},
title = {Exchange interactions at the origin of slow relaxation of the magnetization in {TbCu3} and {DyCu3} single-molecule magnets},
author = {Kettles, Fraser J. and Milway, Victoria A. and Tuna, Floriana and Valiente Barroso, Rafael and Thomas, Lynne H. and Wernsdorfer, Wolfgang and Ochsenbein, Stefan T. and Murrie, Mark},
}