Interactions between Nd 3+ ions beyond the first neighbour shell in LaCl 3 and LaBr 3

Author:

Abstract

Some components of the A ij interaction tensors for 3rd to 7th neighbouring Nd 3+ ions in LaCl 3 and LaBr 3 have been measured by means of e. p. r. There are some appreciable super­ exchange contributions to these interactions. The trends in the variation from one neigh­bour to another were unexpected, 4th and 5th neighbours having much larger superexchange than 3rd neighbours. LaBr 3 is similar to LaCl 3 except that the exchange contributions are somewhat larger in LaBr 3 , corresponding to larger covalent overlap. The qualitative features of the measured exchange interactions are explained in terms of the details of the super­exchange paths. For 7th neighbours the interaction is purely dipolar, and it seems likely that more distant neighbours will also have purely dipolar interactions.

Publisher

The Royal Society

Subject

Pharmacology (medical)

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