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Magnetostriction of some rare earth-aluminum Laves phase compoundsMeasurements of the linear and volume magnetostriction of RAl2 cubic Laves compounds in which R is one of the rare earth elements Gd, Dy, Ho or Er, at temperatures between 4.2 K and the Curie temperature of each compound, are reported. Magnetic fields up to 2.5 Tesla were applied, and magnetostriction was measured using standard strain gage techniques. Saturation magnetostrictions of 17 x 10 to the -6th, -1420 x 10 to the -6th, 60 x 10 to the -6th and -920 x 10 to the -6th are determined at 4.2 K for GdAl2, DyAl2, HoAl2 and ErAl2, respectively. Large forced magnetostriction is observed in GdAl2 above the saturation field and the strain temperature dependence shows a decrease in magnitude below 40 K. A linear dependence of magnetostriction on magnetic field was observed for DyAl2 above 40 K, and the observed temperature dependence is interpreted in terms of the lowest order single-ion magnetoelastic theory. An observed decrease in the magnitude of the strain of HoAl2 below 15 K is associated with a change of the easy direction of magnetization, while in the case of ErAl2, magnetostriction is observed to occur normally up to the Curie temperature. Large volume magnetostriction is obtained for all the compounds with the exception of GdAl2.
Document ID
19800032674
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Pourarian, F.
(Pittsburgh Univ. Pittsburgh, PA, United States)
Wallace, W. E.
(Pittsburgh, University Pittsburgh, Pa., United States)
Date Acquired
August 10, 2013
Publication Date
November 1, 1979
Subject Category
Solid-State Physics
Accession Number
80A16844
Funding Number(s)
CONTRACT_GRANT: NSG-3168
Distribution Limits
Public
Copyright
Other

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