Abstract
We present an explanation of the unusual peak/dip/hump features observed in photoemission experiments on Bi2212 at T ≪ Tc. We argue that the strong spin-fermion interaction combined with the feedback effect on the spin damping due to superconductivity yields a Fermi liquid form of the fermionic spectral function for ω < 2Δ where Δ is the maximum value of the superconducting gap, and a nonFermi liquid form for ω > 2Δ. In the Fermi liquid regime, the spectral function A(kF, ω) displays a quasiparticle peak at ω = Δ; in the nonFermi liquid regime it possesses a broad maximum at ω ≫ Δ. In between the two regimes, the spectral function has a dip at ω ∼ 2Δ.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 440-442 |
| Number of pages | 3 |
| Journal | Physica B: Condensed Matter |
| Volume | 259-261 |
| DOIs | |
| State | Published - 1999 |
Bibliographical note
Funding Information:It is our pleasure to thank G. Blumberg, R. Joynt, M. Norman, D. Pines and J. Schmalian for useful conversations. The research was supported by NSF DMR-9629839 (A.C.) and in part by STCS through NSF DMR-9120000 (D.M.).
Keywords
- Fermi liquid
- Quasiparticle
- Superconducting cuprate