Abstract
Experimental studies of the magnetoelastic properties of the cubic RE Laves phases RNi 2 and RCo 2 are reviewed. The roles of 3d- and 4f-electrons as origins of isotropic and anisotropic magnetostriction are analyzed. It is shown that the magnetoelastic constants λ 111 and λ 100 in RNi 2 compounds are close to about 10 -3 at low temperatures. The large magnetoelastic deformations along 〈1 0 0〉 axes in RCo 2 compounds are caused by the d-electron subsystem and have an itinerant nature. Spontaneous magnetovolume anomalies vs. the H R-Co exchange field reflect the metamagnetic character of the magnetization for the d-electron subsystem in pseudobinaries R' x R'' 1- x Co 2.
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