Doping dependence of the gap anisotropy in LCCO studied by millimeter-wave spectroscopy

Abstract

We measure the penetration depth of optimally doped and underdoped La2-xCexCuO4 in the millimeter frequency domain (4 - 7 cm-1) and for temperatures 2 K < T < 300 K. The penetration depth as function of temperature reveals significant changes on electron doping. It shows quadratic temperature dependence in underdoped samples, but increases almost exponentially at optimal doping. Significant changes in the gap anisotropy (or even in the gap symmetry) may account for this transition.

arXiv comment4 pages, 4 figures

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Cited by in corpus (6)

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• Direct Observation of Non-Monotonic dx2-y2-Wave Superconducting Gap in Electron-Doped High-Tc Superconductor Pr0.89LaCe0.11CuO4
• Superfluid response in electron-doped cuprate superconductors
• Highly anisotropic energy gap in superconducting Ba(Fe${}_{0.9}$Co${}_{0.1}$)${}_2$As${}_2$ from optical conductivity measurements
• BCS $d$-wave behavior in the THz electrodynamic response of electron-doped cuprate superconductors
• Optical study of superconducting Ga-rich layers in silicon