Magnetic Field Dependence of Electronic Specific Heat in Pr_{1.85}   Ce_{0.15} CuO_4
  The specific heat of electron-doped Pr_{1.85} Ce_{0.15} CuO_4 single crystals is reported for the temperature range 2 - 10 K and magnetic field range 0 - 10 T. A non-linear magnetic field dependence is observed for the field range 0 - 2 T. Our data supports 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. 
Hamza Balci, V.N. Smolyaninova, P. Fournier, Amlan Biswas, and R.L.   Greene