We have carried out magnetic susceptibility and electrical resistivity measurements on LaRhAl and CeRhAl that reveal that LaRhAl is superconducting with superconducting transition temperature of about 2.4 K, while CeRhAl shows mixed valent behavior of the cerium ions and is neither magnetically ordered nor superconducting down to 1.7 K.

• Received 13 December 1999

DOI:https://doi.org/10.1103/PhysRevB.62.127