Nernst effect in the electron-doped cuprate superconductor La2−xCexCuO4
P. R. Mandal, Tarapada Sarkar, J. S. Higgins, Richard L. Greene
DOI 10.1103/PhysRevB.97.014522 · Physical Review B
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Abstract
We report a systematic study of the Nernst effect in films of the electron-doped cuprate superconductor La2−xCexCuO4 as a function of temperature and magnetic field (up to 14 T) over a range of doping from underdoped (x=0.08) to overdoped (x=0.16). We have determined the characteristic field scale HC2* of superconducting fluctuation which is found to track the domelike dependence of superconductivity (TC). The fall of HC2* and TC with underdoping is most likely due to the onset of long-range antiferromagnetic order. We also report the temperature onset, Tonset, of superconducting fluctuations above TC. For optimally doped x=0.11Tonset (≅39K) is high compared to TC (26 K). For higher doping Tonset decreases and tends to zero along with the critical temperature at the end of the superconducting dome. The superconducting gap closely tracks HC2* measured from the temperature- and field-dependent Nernst signal.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure unresolved | zero_resistance |
| La2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure unresolved | zero_resistance |
| La2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure unresolved | zero_resistance |
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