Suppression of ferromagnetic order by Ag-doping: a neutron scattering investigation on Ce₂(Pd_1−x Ag _x )₂In (x  =  0.20, 0.50)

Abstract

The ground state magnetic behaviour of Ce(PdAg)In and Ce(PdAg)In, found in the ferromagnetic branch of CePdIn, has been investigated by neutron powder diffraction at low temperature. Ce(PdAg)In is characterized by a ferromagnetic structure with the Ce moments aligned along the c-axis and values of 0.96(2) µ . The compound retains the P4/mbm throughout the magnetic transition, although the magnetic ordering is accompanied by a significant decrease of the lattice strain along [0 0 l], suggesting a magnetostructural contribution. The magnetic behaviour of Ce(PdAg)In is very different; this compound exhibits an extremely reduced magnetic scattering contribution in the diffraction pattern, that can be ascribed to a different kind of ferromagnetic ordering, with extremely reduced magnetic moments (~0.1 µ ) aligned along [0 l 0]. These results point to a competition between different types of magnetic correlations induced by Ag-substitution, giving rise to a magnetically frustrated scenario in Ce(PdAg)In.

Structural and magnetic properties of the Yb2Pd2(In1−x Sn x ) system: a synchrotron x-ray and neutron powder diffraction investigation

“…Ce 2 Pd 2 In is a non-stoichiometric compound allowing the development of two different solid solution branches on account of different substitutional mechanisms; in the Pd-rich branch the antiferromagnetic structure is characterized by an incommensurate magnetic propagation wave vector k = (δ,0,0) whereas in the Ce-rich branch a ferromagnetic order is observed; in both cases magnetic moments are aligned parallel to the c axis [12]. As Pd is progressively substituted by Ag, the pristine ferromagnetic ordering is suppressed; for Ce 2 (Pd 0.5 Ag 0.5 ) 2 In a different ferromagnetic arrangement is observed, with magnetic moments aligned along the b axis [25].…”