Nernst effect in the electron-doped cuprate superconductor La2-xCexCuO4

Abstract

We report a systematic study of the Nernst effect in films of the electron doped cuprate superconductor La2-xCexCuO4 (LCCO) 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 dome-like dependence of superconductivity (TC). The fall of HC2* and TC with underdoping is most likely due to the onset of long range anti-ferromagnetic order. We also report the temperature onset, Tonset, of superconducting fluctuations above TC. For optimally doped x=0.11 Tonset (39 K) 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.

arXiv comment35 pages, 13 figures

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Cited by in corpus (6)

• The Strange Metal State of the Electron-Doped Cuprates
• Correlation between scale-invariant normal state resistivity and superconductivity in an electron-doped cuprate
• Anomalous quantum criticality in the electron-doped cuprates
• Superfluid stiffness in cuprates: Effect of Mott transition and phase competition
• BCS $d$-wave behavior in the THz electrodynamic response of electron-doped cuprate superconductors
• Magnetic field-tuned quantum criticality in optimally electron-doped cuprate thin films