Nernst Effect in Electron-Doped Pr 2−x Ce x CuO 4
Abstract
The Nernst effect of Pr
2−x
Ce
x
CuO
4
(x=0.13, 0.15, and 0.17) has been measured on thin film samples between 5-120 K and 0-14 T. In comparison to recent measurements on hole-doped cuprates that showed an anomalously large Nernst effect above the resistive T
c
and H
c2
\cite{xu,wang1,wang2,capan}, we find a normal Nernst effect above T
c
and H
c2
for all dopings. The lack of an anomalous Nernst effect in the electron-doped compounds supports the models that explain this effect in terms of amplitude and phase fluctuations in the hole-doped cuprates. In addition, the H
c2
(T) determined from the Nernst effect shows a conventional behavior for all dopings. The energy gap determined from H
c2
(0) decreases as the system goes from under-doping to over-dopingin agreement with the recent tunnelling experiments.