In. Goncharenko et al., INTERPLAY OF MAGNETIC AND HYDROGEN ORDERS IN THE LAVES HYDRIDE YMN2H4.3, Physical review. B, Condensed matter, 56(5), 1997, pp. 2580-2584
We have performed a neutron-diffraction study of the Laves hydride YMn
2H4.3 to investigate the interplay between the atomic order in the hyd
rogen sublattice and the magnetic structure. We find that structural o
rder in the H sublattice and antiferromagnetic order in the Mn sublatt
ice have the same rhombohedral symmetry. At ambient pressure we observ
e a first-order magnetostructural transition. where the magnetic subla
ttice transforms form a paramagnetic state to an antiferromagnetic one
, as the hydrogen atoms form the ordered superstructure. An applied pr
essure decouples the two types of order, which then occur at different
temperatures. It allows us to separate the effects of structural orde
r from those related to tile average Mn-Mn distance.