Magnetoelastic properties ofequiatomic compounds
- 1 October 1977
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 16 (7), 3182-3193
- https://doi.org/10.1103/physrevb.16.3182
Abstract
The magnetoelastic properties of the ferromagnetic cubic compounds of heavy rare earths with zinc () are investigated. Lattice distortions occuring below the ordering point are particularly strong when tetragonal: For instance, DyZn exhibits at low temperature a spontaneous tetragonal strain expressed as . All of these magnetoelastic properties are chiefly due to the crystalline electric field splitting of the ground-state multiplet. But the tetragonal distortion observed in GdZn below the ordering point reveals pseudodipolar magnetoelastic effects to be important also; this contribution is taken into account for all the compounds. From our strain gauges and capacitance dilatometer experiments we deduce the one-ion and two-ion magnetoelastic coefficients across the series. The former ones are compared with determinations from ultrasonic measurements and their variation through the series is interpreted in terms of crystal-field theory. Finally, an attempt was made to connect these coefficients to the present knowledge of the conduction band in these CsCl-type intermetallic compounds.
Keywords
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