Affordable Access

deepdyve-link
Publisher Website

Strength of the Spin-Fluctuation-Mediated Pairing Interaction in a High-Temperature Superconductor

Authors
Type
Published Article
Publication Date
Submission Date
Identifiers
DOI: 10.1038/nphys1180
Source
arXiv
License
Yellow
External links

Abstract

Theories based on the coupling between spin fluctuations and fermionic quasiparticles are among the leading contenders to explain the origin of high-temperature superconductivity, but estimates of the strength of this interaction differ widely. Here we analyze the charge- and spin-excitation spectra determined by angle-resolved photoemission and inelastic neutron scattering, respectively, on the same crystals of the high-temperature superconductor YBa2Cu3O6.6. We show that a self-consistent description of both spectra can be obtained by adjusting a single parameter, the spin-fermion coupling constant. In particular, we find a quantitative link between two spectral features that have been established as universal for the cuprates, namely high-energy spin excitations and "kinks" in the fermionic band dispersions along the nodal direction. The superconducting transition temperature computed with this coupling constant exceeds 150 K, demonstrating that spin fluctuations have sufficient strength to mediate high-temperature superconductivity.

Statistics

Seen <100 times