Abstract of Publication No. 528
Roland Bircher, Grégory Chaboussant, Stefan T. Ochsenbein, Felix Fernandez-Alonso,
Hans U. Güdel and Euan K. Brechin
We report on the magnetic properties of the enneanuclear mixed-valent
(1). Using inelastic neutron scattering (INS) spectroscopy, we
have confirmed the S = 17/2 cluster ground state of 1.
Furthermore, we have determined accurately the anisotropy parameters of the zero
field split ground state. The cluster 1 exhibits a strong
negative axial anisotropy where
D = -0.249(5) cm–1. It is necessary to include an axial higher
order term in the effective spin Hamiltonian to
account for the experimental data.