Crossover from inelastic magnetic scattering of Cooper pairs to spin-wave dispersion produces the low-energy kink structure in the spectra of cuprate superconductors

Article

关键词: 2-DIMENSIONAL ANGULAR-CORRELATION;    FERMI-SURFACE;    COMPTON-SCATTERING;    MOMENTUM DENSITIES;    ALLOYS;    EXCITATIONS;    STATES;   

DOI  :  10.1103/PhysRevB.85.144526

来源: SCIE

【 摘 要 】

We present GW-based-self-energy calculations for the state of the coexisting spin-density-wave and d-wave superconductivity in a series of cuprate superconductors. The spin-resonance spectrum is found to exhibit the typical hourglass 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 of slope in the quasiparticle self-energy, and hence, the low-energy kink commences in the single-particle quasiparticle spectrum. The calculated electron-boson-coupling strength agrees well with experimental data as a function of temperature, doping, and material. The results demonstrate that electronic correlations dominate the quasiparticle spectra of cuprates near the low-energy kink, suggesting a relatively smaller role for phonons in this energy range.

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