We have performed field-and temperature-dependent magnetization, resistivity, and heat-capacity measurements on polycrystalline samples of the Y͑Ni 2Ϫx Co x )B 2 C system with 0.0рxр0.4. Values of T c , 0 ,H c2 ,⌰ D , , and N(E d ) were determined for various samples. We observe that ⌰ D increases with x, while all the other parameters decrease with x. The T c vs x data can be described using the BCS theory and the measured values of N(E f ) and ⌰ D . The results suggest that the decrease in T c is due to the decrease in N(E f ), in agreement with the results from band structure calculations.
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