s-Wave-Like excitation in the superconducting state of electron-doped cuprates with d-wave pairing

Abstract

An intrinsic physical mechanism, based on the doping evolution of the Fermi surface (FS), is explored to reconcile the contradictory experimental results on the superconducting (SC) pairing symmetry in electron-doped cuprates. It is argued that the FS pocket around $(\pi /2,\pi /2)$ has not yet formed until doping reaches about the optimal value. Therefore, in the underdoped regime, even if the SC order parameter is $d$ wave which vanishes along the line $k_x=k_y$, the quasiparticle excitation gap is still finite and looks s-wave-like due to the absence of the FS across that line. This makes it possible, with d-wave SC pairing, to understand those experiments which evidenced the s-wave quasiparticle excitation. An explicit theory with consideration of both antiferromagnetic and SC orders is implemented to exhibit the FS evolution from underdoping to overdoping and associated with it the variations of the quasiparticle property, electronic density of states, and low temperature dependences of the physical quantities heat capacity and superfluid density.

arXiv comment10 pages, 5 figures, accepted for publication in Phys. Rev. B

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• Nodeless d-wave superconducting pairing due to residual antiferromagnetism in underdoped Pr${}_{2-x}$Ce${}_x$CuO${}_{4-\delta }$
• Pairing mechanism of high-temperature superconductivity: Experimental constraints
• Phase Competition and Anomalous Thermal Evolution in High-Temperature Superconductors
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• Superfluid density in the $s_{\pm }$-wave state of clean iron-based superconductors
• Prediction of $f$-wave pairing symmetry in YBa${}_2$Cu${}_3$O${}_{6+x}$ cuprates
• Impurity resonance states in electron-doped high T_c superconductors
• Topological phase transition from nodal to nodeless d-wave superconductivity in electron-doped cuprate superconductors
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