Resistivity of Nd1.85Ce0.15Cu04-δ single crystal along c-axis in lower field

Nd1.85Ce0.15CoO4-delta single crystals with zero-resistance temperature T-c0 approximate to 21K were successfully grown by self-flux slow cooling method. We have measured the resistivity transition curves along the c-axis in different fields parallel or perpendicular to the sample surface, respectively, and at fixed field H = 0.5T for various angles. The result shows that the field dependence of differential-resistance peak temperature T-p follows the formula H = H-0 (1 - T-p (h) / T-p (0))(2) for H//c-axis and H//ab-plane, respectively. The angular dependence of peak temperature T-p can be scaled by the effective mass model as T-p proportional to H-1/2 (cos(2) theta + sin(2) theta/gamma(2))(1/4). The anisotropic parameter gamma of the crystal is about 45.