Magnetostriction in pure and Tb-doped amorphous Gd sub 2 Cu

Journal Article · Mon Apr 15 00:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347876· OSTI ID:5493208

Arnaudas, J I; del Moral, A ^[1]; de Groot, P A.J.; Rainford, B D; El Khadi, M ^[2]

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1. Laboratorio de Magnetismo, DFMC-ICMA, Universidad de Zaragoza CSIC, 50009-Zaragoza, Spain (ES)
2. Department of Physics, University of Southampton, S09 5NH, (United Kingdom)

Magnetostriction, parallel ({lambda}{sub {parallel}}) and perpendicular ({lambda}{sub {perpendicular}}) to the applied magnetic field, and thermal expansion measurements have been performed in {ital a}-Gd{sub 2}Cu and {ital a}-(Gd{sub 0.98}Tb{sub 0.02}){sub 2}Cu. The volume ({omega}={lambda}{sub {parallel}}+2{lambda}{sub {perpendicular}}) field-induced magnetostriction peaks at the magnetic transition temperatures. The anisotropic magnetostriction ({lambda}{sub {ital t}} ={lambda}{sub {parallel}}{minus}{lambda}{sub {perpendicular}}) in {ital a}-Gd{sub 2}Cu is non-null and also shows a peak; in the doped compound the peak no longer exists and {lambda}{sub {ital t}} increases down to low temperatures. The strain dependencies of the isotropic and longitudinal two-ion spin-exchange-correlation functions explain the results for {ital a}-Gd{sub 2}Cu and the thermal dependence of {omega} in {ital a}-(Gd{sub 0.98}Tb{sub 0.02}){sub 2}Cu. The strong single-ion random anisotropy of Tb ions accounts for the {lambda}{sub {ital t}} behavior in the doped compound.

• OSTI ID: 5493208
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
AMORPHOUS STATE
ANGULAR MOMENTUM
ANISOTROPY
COPPER ALLOYS
CORRELATION FUNCTIONS
CRYSTALS
DOPED MATERIALS
EXCHANGE INTERACTIONS
EXPANSION
FUNCTIONS
GADOLINIUM ALLOYS
INTERACTIONS
MAGNETIC PROPERTIES
MAGNETOSTRICTION
MATERIALS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
POLYCRYSTALS
QUENCHING
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
SPIN
TERBIUM ADDITIONS
TERBIUM ALLOYS
THERMAL EXPANSION