  Non-collinear triangular antiferromagnets with a coplanar spin arrangement
and vanishing net magnetic moment can exhibit a large anomalous Hall effect
owing to their non-vanishing momentum space Berry curvature. Here we show the
existence of a large field induced topological Hall effect in the non-coplanar
triangular antiferromagnetic geometry of Mn3Sn. A detailed magnetic and Hall
effect measurements demonstrate the presence of three distinct Hall
contributions; a high temperature anomalous Hall effect, a low temperature
topological Hall effect and an intermediate temperature region with coexistence
of both the effects. The origin of the observed topological Hall effect is
attributed to the scalar spin chirality induced real space Berry curvature that
appears when the system undergoes from a trivial non-coplanar triangular spin
alignment to a topologically protected non-trivial spin texture like skyrmions
by application of magnetic field at low temperatures.
