RU-101 NQR STUDY IN SUPERCONDUCTING CERU2

We present measurements of the NQR spectrum and the nuclear spin latti ce relaxation rate, 1/T-1, of Ru-101 in superconducting CeRu2 from 1.9 K to 10 K. From the NQR spectrum, the electric quadrupole interaction parameters were determined to be nu(Q)=13.2 MHz and eta=O.1/T-1 varie s in proportion to temperature in the normal state, and has the Hebel- Slichter coherence peak just below the superconducting transition temp erature, T-c, of 6.2 K, and decreases exponentially at low temperature s with the energy gap of 2 Delta=4.0k(B)T(c). Ru-101 NQR study indicat es that CeRu2 is an s-wave and strong-coupling superconductor.