Superconductivity in the intermetallic compound YRhAl

Details Superconductivity in the intermetallic compound YRhAl Superconductivity in the intermetallic compound YRhAl

2004-06-04

arxiv.org/abs/cond-mat/0406109v1

Physics

Condensed Matter

Superconductivity

12 pages of text and fiugures

Scientific paper

10.1016/j.ssc.2004.06.024

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.

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