Magnetic-field dependence of electronic specific heat in Pr1.85Ce0.15CuO4 -: art. no. 174510

The specific heat of electron-doped Pr1.85Ce0.15CuO4 single crystals is reported for the temperature range 2-7 K and magnetic field range 0-10 T. A nonlinear magnetic-field dependence is observed for the field range 0-2 T. Our data support a model with lines of nodes in the gap function of these superconductors. Theoretical calculations of the electronic specific heat for dirty d-wave, clean d-wave, and s-wave symmetries are compared to our data.