Temperature and magnetic field dependence of the elastic properties of rare earth-cobalt laves phase compounds

H. Klimker, M. P. Dariel, M. Rosen

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Abstract

Ultrasonic sound velocity measurements have been carried out in order to determine the elastic moduli, adiabatic compressibility and the Debye temperature of polycrystalline rare earth-cobalt Laves phase compounds RCo2(R = Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er and Lu) and YCo2 between 4.2 and 300 K. DyCo2 HoCo2 and ErCo2 exhibit a first-order transition at Tc. In SmCo2 and TbCo2 the phase transition is of the second-order accompanied by a large lattice softening. NdCo2, GdCo2 and HoCo2 show spin reorientations from one easy direction of magnetization to another one, at low temperatures, below Tc. The influence of an external magnetic field (up to 25 kOe) on the elastic properties of these Laves phases, the so-called ΔE effect was determined. No saturation was reached in SmCo2, TbCo2 and DyCo2 in magnetic fields up to 25 kOe. The behavior of the RCo2 compounds was compared with that of RFe2, published earlier.

Original languageEnglish
Pages (from-to)195-200
Number of pages6
JournalJournal of Physics and Chemistry of Solids
Volume40
Issue number3
DOIs
StatePublished - 1 Jan 1979

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