Anomalous Fermi-Surface Dependent Pairing in a Self-Doped High-Tc Superconductor

Yulin Chen; Akira Iyo; Wanli Yang; Xingjiang Zhou; Donghui Lu; Hiroshi Eisaki; Thomas P. Devereaux; Zahid Hussain; Z. -X. Shen

doi:10.1103/PhysRevLett.97.236401

Anomalous Fermi-Surface Dependent Pairing in a Self-Doped High-Tc Superconductor

Superconductivity 2009-11-11 v1 Materials Science

Authors: Yulin Chen , Akira Iyo , Wanli Yang , Xingjiang Zhou , Donghui Lu , Hiroshi Eisaki , Thomas P. Devereaux , Zahid Hussain , Z. -X. Shen

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Abstract

We report the discovery of a self-doped multi-layer high Tc superconductor Ba2Ca3Cu4O8F2(F0234) which contains distinctly different superconducting gap magnitudes along its two Fermi surface(FS) sheets. While formal valence counting would imply this material to be an undoped insulator, it is a self-doped superconductor with a Tc of 60K, possessing simultaneously both electron- and hole-doped FS sheets. Intriguingly, the FS sheet characterized by the much larger gap is the electron-doped one, which has a shape disfavoring two electronic features considered to be important for the pairing mechanism: the van Hove singularity and the antiferromagnetic (Pi/a, Pi/a) scattering.

Keywords

high-Tc superconductor self-doping Fermi surface superconducting gap pairing mechanism van Hove singularity

Cite

@article{arxiv.cond-mat/0611291,
  title  = {Anomalous Fermi-Surface Dependent Pairing in a Self-Doped High-Tc Superconductor},
  author = {Yulin Chen and Akira Iyo and Wanli Yang and Xingjiang Zhou and Donghui Lu and Hiroshi Eisaki and Thomas P. Devereaux and Zahid Hussain and Z. -X. Shen},
  journal= {arXiv preprint arXiv:cond-mat/0611291},
  year   = {2009}
}

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4 pages, 5 figures; accepted by Phys. Rev. Lett

Anomalous Fermi-Surface Dependent Pairing in a Self-Doped High-Tc Superconductor

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