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We report a systematic study of normal state Nernst effect in theelectron-doped cuprates Pr$_{2-x}$Ce$_x$CuO$_{4-\delta}$ over a wide range ofdoping (0.05$\leq x \leq$0.21) and temperature. At low temperatures, weobserved a notable vortex Nernst signal above T$_c$ in the underdoped films,but no such normal state vortex Nernst signal is found in the overdoped region.The superconducting fluctuations in the underdoped region are most likelyincoherent phase fluctuations as found in hole-doped cuprates. At hightemperatures, a large normal state Nernst signal is found at dopings fromslightly underdoped to highly overdoped. Combined with normal statethermoelectric power, Hall effect and magnetoresistance measurements, the largeNernst effect is compatible with two-band model. For the highly overdopedfilms, the large Nernst effect is anomalous and not explainable with a simplehole-like Fermi surface seen in photoemission experiments.

Normal State Nernst Effect in Electron-doped Pr2-xCexCuO4: Superconducting Fluctuations and Two-band Transport