Specific heat of amorphous CexRu100-x alloys

We have measured the specific heat on sputtered amorphous (a-) CexRu100-x alloys for 15 x80 from 5 to 300K. The Cp/T nicely follows a function of gamma+BT2 above 8K in each Ce concentration. In the Ce-rich side (x67), the electronic specific coefficient gamma shows a very large value (gamma=180mJ/molK2 at x=80), suggesting formation of the heavy fermion (dense Kondo) state at low temperature. However, the gamma decreases rapidly with decreasing the Ce concentration. In the Ru-rich side (x < 39), the gamma becomes less than 10mJ/molK2 and the superconductivity occurs. This gamma-value is almost the same as for a-Ce20-yLayRu80 in each La concentration, where the superconductivity occurs at the same superconducting temperature Tc. We made the Kadowaki-Woods plot from the coefficient A of the T2 term in resistivity and gamma in the Ce-rich side. The value of A/gamma2 for present alloys shows about 3.5X10-6muOmegacm(molK2/mJ)2.