Unusual increase of the Kondo effect by hydrogenation : case of the ternary silicide CeNiSi

Mathieu Pasturel (1) , Jean-Louis Bobet (1) , Olivier Isnard (2) , Bernard Chevalier (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Laboratoire de Cristallographie

The ternary silicide CeNiSi, which crystallises in the tetragonal LaPtSi-type structure (a=4.070(2) Å, c=14.030(5) Å), absorbs hydrogen at P(H2)=2 MPa and T=393 K to form the stable hydride CeNiSiH0.8(1). The hydrogenation induces (i) an anisotropic variation of the unit cell parameters (a=4.040(1) Å and c=14.253(4) Å) without significant increase of the unit cell volume (+0.1%) and (ii) a strong increase of the Kondo interaction in comparison with the initial ternary silicide...

Mots clés: Intermetallics; X-ray diffraction; Magnetic measurements; X-ray spectroscopy

Domaines: Matériaux

Mathieu Pasturel, Jean-Louis Bobet, Olivier Isnard, Bernard Chevalier. Unusual increase of the Kondo effect by hydrogenation : case of the ternary silicide CeNiSi. Journal of Alloys and Compounds, 2004, 384 (1-2), pp.39-43. ⟨10.1016/j.jallcom.2004.03.126⟩. ⟨hal-00154482⟩