EPL

Issue		Europhys. Lett. Volume 44, Number 5, December 1998
Page(s)		539 - 544
Section		General
DOI		10.1209/epl/i1998-00507-2

DOI: 10.1209/epl/i1998-00507-2

Europhys. Lett, 44 (5), pp. 539-545 (1998)

Large spins in external fields of cubic group symmetry

V. A. Kalatsky ¹ and V. L. Pokrovsky ^1,2

¹ 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

(received 10 July 1998; accepted 13 October 1998)

PACS. 02.20Df - Finite groups.
PACS. 03.65Sq - Quantum mechanics: Semiclassical theories and applications.
PACS. 75.10Dg - Crystal-field theory and spin Hamiltonians.

Abstract:

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 ${\bf O}$ are classified, namely, 6- and 8-fold coordinations. The spectrum and degeneration of energy levels depend on a remainder $\{J/n\}$ , 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 $\mbox\mbox'$ Sb, where $\rm R=Lu$ , La, Y, and $\rm R'=Er$ , Sm, Ce, Dy, Pm, Yb.

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