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An intrinsic physical mechanism, based on the doping evolution of the Fermisurface (FS), is explored to reconcile the contradictory experimental resultson the superconducting (SC) pairing symmetry in electron-doped cuprates. It isargued that the FS pocket around $(\pi/2,\pi/2)$ has not yet formed untildoping 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 lookss-wave-like due to the absence of the FS across that line. This makes itpossible, with d-wave SC pairing, to understand those experiments whichevidenced the s-wave quasiparticle excitation. An explicit theory withconsideration of both antiferromagnetic and SC orders is implemented to exhibitthe FS evolution from underdoping to overdoping and associated with it thevariations of the quasiparticle property, electronic density of states, and lowtemperature dependences of the physical quantities heat capacity and superfluiddensity.Comment: 10 pages, 5 figures, accepted for publication in Phys. Rev.

physical review. b, condensed matter and materials physics

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi></mml:math>-wave-like excitation in the superconducting state of electron-doped cuprates with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi></mml:math>-wave pairing

s-wave-like excitation in the superconducting state of electron-doped cuprates withd-wave pairing