1210.7490 (Sumiran Pujari et al.)

Boson features in STM spectra of cuprate superconductors: Weak-coupling
phenomenology    [PDF]

Sumiran Pujari, C. L. Henley

We derive the shape of the high-energy features due to a weakly coupled boson in Cuprate superconductors, as seen experimentally in BiSrCaCuO (BSCCO or Bi-2212) by Lee et al [Nature 442, 546 (2006)]. A simplified model is used of d-wave Bogoliubov quasiparticles coupled to Einstein oscillators with a momentum independent electron-boson coupling. An approximate analytic fitting form is derived for the shape of the feature due to the boson in the STM spectrum, which allows us (a) to extract the boson mode's frequency, and (b) to estimate the electron-boson coupling strength.

View original: http://arxiv.org/abs/1210.7490