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 · Physical Review Letters
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Abstract
We report the discovery of a self-doped multilayer high Tc superconductor Ba2Ca3Cu4O8F2 (F0234) which contains distinctly different superconducting gap magnitudes along its two Fermi-surface sheets. While formal valence counting would imply this material to be an undoped insulator, it is a self-doped superconductor with a Tc of 60 K, possessing simultaneously both electron- and hole-doped Fermi-surface sheets. Intriguingly, the Fermi-surface 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 (π/a, π/a) scattering.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2Ca3Cu4O8F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| Ba2Ca3Cu4O8(OδF1-δ)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 105 | Pressure not reported | unknown |
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