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Optical determination of the relation between the electron-boson coupling function and the critical temperature in high-Tc cuprates

Publication date2009
Abstract

We take advantage of the connection between the free-carrier optical conductivity and the glue function in the normal state, to reconstruct from the infrared optical conductivity the glue spectrum of ten different high-Tc cuprates revealing a robust peak in the 50–60 meV range and a broad continuum at higher energies for all measured charge-carrier concentrations and temperatures up to 290 K. We observe that the strong-coupling formalism accounts fully for the known strong temperature dependence of the optical spectra of the high-Tc cuprates, except for strongly underdoped samples. We observe a correlation between the doping trend of the experimental glue spectra and the critical temperature. The data obtained on the overdoped side of the phase diagram conclusively exclude the electron-phonon coupling as the main source of superconducting pairing.

Funding
  • Swiss National Science Foundation - Phénomènes collectifs dans des nouveaux matériaux électroniques
  • Swiss National Science Foundation - NCCR MaNEP
Citation (ISO format)
VAN HEUMEN, Erik et al. Optical determination of the relation between the electron-boson coupling function and the critical temperature in high-Tc cuprates. In: Physical review. B, Condensed matter and materials physics, 2009, vol. 79, n° 18, p. 184512. doi: 10.1103/PhysRevB.79.184512
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Article (Published version)
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Identifiers
ISSN of the journal1098-0121
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