Structural, thermal and magnetic properties of ErMn2D6 synthesized under high deuterium pressure
Journal
Journal of Physics-Condensed Matter
Journal Volume
18
Journal Issue
27
Pages
6409-6420
Date Issued
2006
Author(s)
Paul-Boncour, V.
Abstract
A new phase of ErMn2D6 has been prepared by applying high hydrogen pressure on C14 ErMn2. This phase is isostructural to YMn2D6 and crystallizes with a K2PtCl6 type structure having an ordered anion and a partially disordered cation arrangement as Er and half the Mn atoms are randomly substituted in the same 8c site. This hydride is very stable and decomposes into ErD2 and Mn at about 630 K. The reverse susceptibility follows a Curie–Weiss law with an effective moment of 10 μB similar to that of ErMn2. Although a saturation magnetization of 5 μB is measured at 4.2 K, smaller than that of ErMn2 (8 μB), no long range magnetic order is observed in the neutron patterns. Short range magnetic order, corresponding to both ferromagnetic and antiferromagnetic correlations, is observed in the neutron patterns up to 5 K. The chemical disorder of Er and Mn atoms on the 8c site should prevent the long range magnetic order and favour a distribution of Er spin orientation.
Type
journal article