4f charge-density deformation and magnetostrictive bond strain observed in amorphous TbFe2 by x-ray absorption spectroscopy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2010

4f charge-density deformation and magnetostrictive bond strain observed in amorphous TbFe2 by x-ray absorption spectroscopy

Résumé

The giant magnetostriction observed in rare-earth transition-metal compounds such as Terfenol-D (Tb0.3Dy0.7Fe2) is commonly associated with the huge anisotropy of the 4f electron cloud. We report here the experimental observation of this phenomenon at the atomic scale, in amorphous matter. By using extended x-ray absorption fine structure spectroscopy in a differential mode, the bond strains resulting from the coupling between the anisotropic shape of the Tb 4f charge density and the environment crystalline electric field are measured. In a-TbFe2 we measure Fe-Fe and Fe-Tb bond contractions equal to 6(1)x10−4 Å and of 9(2) x10−4 Å, respectively. These are the smallest atomic displacements ever detected in amorphous matter.
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Dates et versions

hal-00687287 , version 1 (12-04-2012)

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Sakura Pascarelli, M. P. Ruffoni, Angela Trapananti, Olivier Mathon, Carsten Detlefs, et al.. 4f charge-density deformation and magnetostrictive bond strain observed in amorphous TbFe2 by x-ray absorption spectroscopy. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 81, pp.020406(R). ⟨10.1103/PhysRevB.81.020406⟩. ⟨hal-00687287⟩

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