  Heat capacity measurements were used to investigate the magnetic ordering
processes in single crystal samples of SrDy2O4 in a magnetic field applied
along the [010] and [001] directions. In zero field this compound appears to be
magnetically disordered down to at least 0.39 K. A magnetic field applied along
the [010] direction induces a very sharp transition at 20 kOe, seen as a strong
peak in the heat capacity versus field, C(H) curves, while for H // [001], the
magnetisation process is accompanied by the development of only broad features
in the C(H) curves. The process of field induced ordering in \sdo\ appears to
be rather remarkable even in the context of the unusual phase transitions
observed in other geometrically frustrated magnetic systems consisting of
hexagons and triangles.
