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

H. Klimker; M. P. Dariel; M. Rosen

doi:10.1016/0022-3697(79)90015-5

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

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

Department of Materials Engineering

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11 Scopus citations

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 T_c. 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 T_c. 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 language	English
Pages (from-to)	195-200
Number of pages	6
Journal	Journal of Physics and Chemistry of Solids
Volume	40
Issue number	3
DOIs	https://doi.org/10.1016/0022-3697(79)90015-5
State	Published - 1 Jan 1979

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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@article{d0e7b928cdf04f3abdbfad550f204973,

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

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.",

author = "H. Klimker and Dariel, \{M. P.\} and M. Rosen",

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T1 - Temperature and magnetic field dependence of the elastic properties of rare earth-cobalt laves phase compounds

AU - Klimker, H.

AU - Dariel, M. P.

AU - Rosen, M.

PY - 1979/1/1

Y1 - 1979/1/1

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/0018308628

U2 - 10.1016/0022-3697(79)90015-5

DO - 10.1016/0022-3697(79)90015-5

M3 - Article

AN - SCOPUS:0018308628

SN - 0022-3697

VL - 40

SP - 195

EP - 200

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 3

ER -

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

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