Abstract
The magnetostriction of the alloy system ${\mathrm{Ce}}_{\mathrm{x}}$${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Al}}_{2}$ is reported as a function of magnetic field and temperature for H5 T and 1.5T40 K. It is dominated by the Ce atoms and essentially proportional to the Ce concentration for 0.015x1. The volume magnetostriction is abnormally large and can be explained quantitatively by a field-driven shift of the fractional valence of Ce. The anisotropic, volume-conserving part of the magnetostriction is explained quantitatively by field-induced quadrupolar strains associated with the aspherical 4f charge distribution in the trivalent fraction of the Ce atoms.
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