Abstract
The structural and magnetic properties of YMn2D1.15 have been investigated by temperature-dependent neutron diffraction. Magnetic and deuterium orders appear below Tc=217 K. To separate both effects and to study only magnetic ordering, hydrogen atom contribution was cancelled by preparing the compound YMn2(H0.64D0.36)1.15. A noncollinear magnetic structure with 3.1 μB/Mn is observed. Finally the low-temperature structure was fully solved taking into account both deuterium and magnetic contributions. Whereas the deuterium atoms are rand-omly distributed over all the 96g sites (Fd3m) above 217 K, only 12i sites in space group P43m are occupied at low temperature.
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