  We have carried out magnetization, heat capacity, electrical and
magnetoresistance measurements (2-300 K) for the polycrystalline form of
intermetallic compounds, R2RhSi3 (R= Gd, Tb, and Dy), forming in a AlB2 derived
hexagonal structure with a triangular R network. This work was primarily
motivated by a revival of interest on Gd2PdSi3 after about two decades in the
field of Toplogical Hall Effect due to magnetic skyrmions. We report here that
these compounds are characterized by double antiferromagnetic transitions (T_N=
13.5 and 12 K for Gd, 13.5 and 6.5 K for Tb; 6.5 and 2.5 for Dy), but
antiferromagnerism seems to be complex. The most notable observations common to
all these compounds are: (i) There are many features in the data mimicking
those seen for Gd2PdSi3, including the two field-induced changes in isothermal
magnetization as though there are two metamagnetic transitions well below T_N.
In view of such a resemblance of the properties, we speculate that these
Rh-based materials offer a good playground to study toplogical Hall effect in a
centrosymmetric structure, with its origin lying in triangular lattice of
magnetic R ions; (ii) There is an increasing contribution of electronic
scattering with decreasing temperature towards T_N in all cases, similar to
Gd2PdSi3, thereby serving as examples for a theoretical prediction for a
classical spin-liquid phase in metallic systems due to geometrical frustration.
