The Doniach diagram and hydrogenation of the ternary compounds CePdIn and CePdSn

Bernard Chevalier (1) , Alain Wattiaux (1) , Jean-Louis Bobet (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The process of hydrogenation of the antiferromagnetic compounds CePdIn and CePdSn has been studied. Investigation of the new hydrides CePdInH and CePdSnH by means of x-ray powder diffraction reveals that they adopt the same crystal symmetry as the original intermetallic but the unit cell volume increases during the hydrogenation. Magnetization, electrical resistivity, thermoelectric power and 119Sn Mössbauer spectroscopy measurements reveal that CePdInH and CePdSnH order antiferromagnetically below TN = 3.0(2) and 5.0(2) K respectively. Moreover, the physical properties of the hydrides are less influenced by the Kondo effect. The changes of the Néel temperature induced by H insertion are explained on the basis of Doniach's diagram considering the competition between Kondo and Ruderman–Kittel–Kasuya–Yosida interactions.

Domaines: Matériaux

Bernard Chevalier, Alain Wattiaux, Jean-Louis Bobet. The Doniach diagram and hydrogenation of the ternary compounds CePdIn and CePdSn. Journal of Physics: Condensed Matter, 2006, 18 (5), pp.1743-1755. ⟨10.1088/0953-8984/18/5/026⟩. ⟨hal-00018443⟩