Physics – Condensed Matter – Superconductivity
Scientific paper
2012-02-13
Physics
Condensed Matter
Superconductivity
8 pages, 6 figures. revised version submitted to PRB
Scientific paper
We present GW based self-energy calculations for the state of coexisting spin-density wave and d-wave superconductivity in a series of cuprate superconductors. In these systems, the spin resonance spectrum exhibits the typical `hour-glass' form, whose upward and downward dispersion branches come from the gapped spin-wave and magnetic scattering of Cooper pairs, respectively. We show that the crossover between these two different dispersion features leads to an abrupt change in slope in the quasiparticle self-energy, and hence the low-energy kink commences in the single-particle quasiparticle spectrum. The calculated electron-bosonic coupling strength agrees well with experimental data as a function of temperature, doping and material. The results demonstrate that the electronic correlations dominate the quasiparticle spectra of cuprates near the low-energy kink, suggesting a relatively smaller role for phonons in this energy range.
Bansil Arun
Das Tanmoy
Markiewicz Robert S.
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