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.

References in corpus (1)

• Low-energy excitations around (π/2, π/2) points in the pseudogap phase of Nd_1.85Ce_0.15CuO_4

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