We have obtained the temperature dependence of the upper critical field Hc2(T) for a single crystalline of intermetallic YNi2B2c from magnetization measurements for the field parallel to the c-axis. A positive second derivative of Hc2(T) with respect to the temperature was observed at the low temperature region. This behavior is in sharp contrast to the conventional WHH theory for the weak-coupled superconductor.
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