Normal-state Nernst effect in electron-doped Pr2−xCexCuO4−δ: Superconducting fluctuations and two-band transport
Pengcheng Li, R. L. Greene
DOI 10.1103/PhysRevB.76.174512 · Physical Review B
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Abstract
We report a systematic study of the normal-state Nernst effect in the electron-doped cuprates Pr2−xCexCuO4−δ over a wide range of doping (0.05⩽x⩽0.21) and temperature. At low temperatures, we observed a notable vortex Nernst signal above Tc 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 likely incoherent phase fluctuations as found in hole-doped cuprates. At high temperatures, a large normal-state Nernst signal is found at dopings from slightly underdoped to highly overdoped. Combined with normal-state thermoelectric power, Hall effect, and magnetoresistance measurements, the large Nernst effect is compatible with the two-band model. For the highly overdoped films, the large Nernst effect is anomalous and not explainable with the simple holelike Fermi surface seen in photoemission experiments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr2-xCexCuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.8 | Pressure not reported | unknown |
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