Quantum-critical pairing in electron-doped cuprates

Yuxuan Wang, Andrey Chubukov

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31 Scopus citations

Abstract

We revisit the problem of spin-mediated superconducting pairing at the antiferromagnetic quantum-critical point with the ordering momentum (π,π)=2kF. The problem has been previously considered by one of the authors. However, it was later pointed out that the analysis neglected umklapp processes for the spin polarization operator. We incorporate umklapp terms and reevaluate the normal state self-energy and the critical temperature of the pairing instability. We show that the self-energy has a Fermi-liquid form and obtain the renormalization of the quasiparticle residue Z, the Fermi velocity, and the curvature of the Fermi surface. We argue that the pairing is a BCS-type problem, but go one step beyond the BCS theory and calculate the critical temperature Tc with the prefactor. We apply the results to electron-doped cuprates near optimal doping and obtain Tc≥10K, which matches the experimental results quite well.

Original languageEnglish (US)
Article number024516
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number2
DOIs
StatePublished - Jul 29 2013

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