The magnetic field dependence of the low temperature (0.1K to 3K) residual specific heat of Pr2−xCexCuO4−δ

Measurements are presented of the low temperature specific heat of three polycrystalline samples of Pr2−xCexCuO4 in magnetic fields of 0, 2 and 4 Tesla. The residual specific heat contribution in zero field seems to have a form αTn (n<1) for all of the samples, whether superconducting or non-superconducting. The behaviour in magnetic fields is similar to that reported for other high Tc superconductors where a change in exponent of the residual term occurs at some crossover temperature in magnetic fields.