Strongly correlated s-wave pairing in the n-type infinite-layer cuprate

Details Strongly correlated s-wave pairing in the n-type infinite-layer cuprate Strongly correlated s-wave pairing in the n-type infinite-layer cuprate

2002-06-14

arxiv.org/abs/cond-mat/0206255v1

Phys. Rev. Lett. 88, 227002 (2002)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures. Published in Physical Review Letter. Corresponding author: Nai-Chang Yeh (e-mail: ncyeh@caltech.edu)

Scientific paper

10.1103/PhysRevLett.88.227002

Quasiparticle tunneling spectra of the electron-doped (n-type) infinite-layer cuprate Sr_{0.9}La_{0.1}CuO_2 reveal characteristics that counter a number of common phenomena in the hole-doped (p-type) cuprates. The optimally doped Sr_{0.9}La_{0.1}CuO_2 with T_c = 43 K exhibits a momentum-independent superconducting gap \Delta = 13.0 +- 1.0 meV that substantially exceeds the BCS value, and the spectral characteristics indicate insignificant quasiparticle damping by spin fluctuations and the absence of pseudogap. The response to quantum impurities in the Cu-sites also differs fundamentally from that of the p-type cuprates with d_{x^2-y^2}-wave pairing symmetry.

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