Assessment of the anisotropy in the molecule Mn19 with a high-spin ground state S = 83/2 by 35 GHz electron paramagnetic resonance.
35 GHz electron paramagnetic resonance experiments on a powder sample of the magnetic molecule Mn 19 with a high-spin ground state S = 83/2 are presented. At low temperatures, the data are well described by the simulated spectra for an isolated spin with a zero-field-splitting parameter D = 0.004 cm (-1), which is, in particular, positive. Hence, Mn 19 is not a single-molecule magnet; the previously observed magnetic hysteresis at ultralow temperatures is likely due to intermolecular dipolar interactions.
Waldmann
Oliver
O
Physikalisches Institut, Universität Freiburg, Freiburg, Germany. oliver.waldmann@physik.uni-freiburg.de
Ako
Ayuk M
AM
Güdel
Hans U
HU
Powell
Annie K
AK