Nondipolar Interaction Between Nearest-Neighbor Neodymium Ions in the Ethyl Sulfate

30 November 1964

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 136 (5A) , A1341-A1347
https://doi.org/10.1103/physrev.136.a1341

Abstract

Measurements made on the EPR spectrum of a pair of interacting nearest-neighbor neodymium ions in lanthanum ethyl sulfate show that the interaction is predominantly dipolar, but that there is an additional term

A_{ij} S_{iz} S_{jz} + \frac{1}{2} B_{ij} (S_{i +} S_{j -} + S_{i -} S_{j +})

, with

A_{ij} = (+ 32 \pm 6) \times 10^{- 4}

{cm}^{- 1}

and

B_{ij} = (- 3 \pm 3) \times 10^{- 4}

{cm}^{- 1}

. A semiquantitative discussion is given of the possible origins of this nondipolar contribution including super-exchange, electric quadrupole-quadrupole, and virtual-phonon exchange interactions.

Keywords

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