THE MAGNETIC-FIELD DEPENDENCE OF THE LOW-TEMPERATURE (0.1K TO 3K) RESIDUAL SPECIFIC-HEAT OF PR2-XCEXCUO4-DELTA

Measurements are presented of the low temperature specific heat of thr ee polycrystalline samples of Pr2-zCezCuO4 in magnetic fields of 0, 2 and 4 Tesla. The residual specific heat contribution in sere field see ms to have a form alpha T-n (n < 1) for all of the samples, whether su perconducting 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 temp erature in magnetic fields.