Spin-resolved impurity resonance states in electron-doped cuprate superconductors

Abstract

With the aim at understanding the non-monotonic $d_{x^2-y^2}$-wave gap, we analyze the local electronic structure near impurities in the electron-doped cuprate superconductors. We find that the local density of states near a non-magnetic impurity in the scenario of $d_{x^2-y^2}$-wave superconductivity with higher harmonics is qualitatively different from that obtained from the $d_{x^2-y^2}$-wave superconductivity coexisting with antiferromagnetic spin density wave order. We propose that spin-polarized scanning tunneling microscopy measurements can distinguish the two scenarios and shed light on the real physical origin of a non-monotonic $d_{x^2-y^2}$-wave gap.

5 pages, 3 figures, updated version and accepted in Phys. Rev. B

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