Abstract The effect of applied pressure on the valence and magnetic properties of YbMn 2 Ge 2 (tetragonal ThCr 2 Si 2 -type structure; I4/mmm) has been investigated by neutron powder diffraction measurements over the temperature range ∼1.5–300 K. Concurrent with a strong decrease in unit cell volume (∼−7%), the magnetic ordering scheme of YbMn 2 Ge 2 is found to change significantly from a predominately planar antiferromagnetic arrangement at ambient temperature and pressure to a collinear antiferromagnetic structure around p ∼1.5 Gpa.

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