Large spins in external fields of cubic group symmetry
Department of Physics, Texas A & M University, College Station - Texas 77843-4242, USA
2 Landau Institute for Theoretical Physics, Kosygin str.2, Moscow 117940, Russia
Accepted: 13 October 1998
We predict that large moments J, placed into a crystal field with the cubic point symmetry group, differ in their spectrum and magnetic properties. E.g., properties of the odd-integer moments are different from those of the even-integer. The effect is due to Berry's phases gained by the moment, when it tunnels between minima of the external field. Two cases of the group are classified, namely, 6- and 8-fold coordinations. The spectrum and degeneration of energy levels depend on a remainder , where the divisor n=4 and 3 for the 6-fold and 8-fold coordination, respectively. Large spins in the cubic environment of the 6- and 8-fold coordinations can be realized by diluted alloys Sb, where , La, Y, and , Sm, Ce, Dy, Pm, Yb.
PACS: 02.20.Df – Finite groups / 03.65.Sq – Quantum mechanics: Semiclassical theories and applications / 75.10.Dg – Crystal-field theory and spin Hamiltonians
© EDP Sciences, 1998