Hyperfine Fields and Isomer Shifts in Magnetically Ordered Europium Compounds

Author Info

H. H. Wickman, Bell Telephone Laboratories, Inc.
I. Nowik, Bell Telephone Laboratories, Inc.
J. H. Wernick, Bell Telephone Laboratories, Inc.
D. A. Shirley, University of California - Berkeley
Richard B. Frankel, National Magnet Laboratory,Follow

Recommended Citation

Published in Journal of Applied Physics, Volume 37, Issue 3, March 1, 1966, pages 1246-1247.

NOTE: At the time of publication, the author Richard B. Frankel was not yet affiliated with Cal Poly.

The definitive version is available at https://doi.org/10.1063/1.1708417.

Abstract

The Mössbauer technique was employed to study hyperfine fields in several ordered divalent europium compounds at low temperatures. The intermetallics EuCu₂, EuAl₂, and EuAl₄ were ordered at helium temperatures and the observed fields and isomer shifts were 189(8) kOe, −0.88 cm∕sec; 278(8) kOe, −0.97 cm∕sec; and 290(8) kOe, −1.14 cm∕sec, respectively. Comparison of these results and previous measurements with EuO, EuS, and Eu metal indicates a possible correlation between isomer shift and internal field. With the exception of EuCu2 the internal fields increase with increasing magnitude of isomer shift. Interpretation of this trend with a core polarization model yields a value of 120±20 kOe for the field per 6s valence electron.

Disciplines

Physics

Copyright

1966 American Institute of Physics.

Publisher statement

This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics.