Evidence for nodal quasiparticles in electron-doped cuprates from penetration depth measurements

Abstract

The in-plane magnetic penetration depth, $\lambda (T)$, was measured down to 0.4 K in single crystals of electron-doped superconductors, Pr${}_{1.85}$Ce${}_{0.15}$CuO${}_{4-\delta }$ (PCCO) and Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_{4-\delta }$ (NCCO). In PCCO, the superfluid density varies as $T^2$ from 0.025 up to roughly 0.3 $T/T_c$ suggestive of a d-wave state with impurities. In NCCO, $\lambda (T)$ shows a pronounced upturn for $T<4$ K due to the paramagnetic contribution of Nd${}^{3+}$ ions. Fits to an s-wave order parameter over the standard BCS range ($T/T_c$ = 0.32) limit any gap to less than ${\Delta }_{min}(0)/T_c=0.57$ in NCCO. For PCCO, the absence of paramagnetism permits a lower temperature fit and yields an upper limit of ${\Delta }_{min}(0)/T_c=0.2$.

Revised version

References in corpus (5)

• Phase-sensitive Evidence for d-wave Pairing Symmetry in Electron-doped Cuprate Superconductors
• Meissner - London state in superconductors of rectangular cross-section in perpendicular magnetic field
• Microwave Electrodynamics of Electron-Doped Cuprate Superconductors
• Anomalous Low Temperature Behavior of Superconducting Nd(1.85)Ce(0.15)CuO(4-y)
• Andreev reflections and tunneling spectroscopy on underdoped NCCO (x = 0.15)

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