  The intermetallic compound, YRhAl, has been prepared and is found to be
isomorphic with RRhAl (R=Pr, Nd, Gd, Ho and Tm) compounds crystallizing in the
orthorhombic TiNiSi-type structure (Space group Pnma). Heat capacity and
electrical resistivity measurements in the He-3 temperature range reveal that
this compound is superconducting with a transition temperature, Tc, of 0.9 K.
The electronic specific heat coefficient, gamma, and the Debye temperature are
found to be 6.1 mJ/mole K and 197 K, respectively. The specific heat jump at
the superconducting transition temperature is found to be consistent with the
BCS weak-coupling limit. This combined with the earlier observation of
superconductivity in LaRhAl (Tc = 2.4 K) having a different structure than that
of YRhAl, suggests that the underlying structure is not very crucial for the
occurrence of superconductivity in RRhAl series of compounds.
