Possible phononic mechanism for dx2−y2 superconductivity in the presence of short-range antiferromagnetic correlations
Alexander Nazarenko, Elbio Dagotto
DOI 10.1103/PhysRevB.53.R2987 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We discuss the high-temperature superconductors in a regime where the antiferromagnetic (AF) correlation length is only a couple of lattice spacings. In the model proposed here, these short-range AF fluctuations play an essential role in the dressing of the carriers, but the attraction needed for superconductivity arises from a transverse phonon oxygen mode with a finite buckling angle as it appears in YBa2Cu3O7−δ. A simple fermion-phonon model analog to the Holstein model is introduced to account for this effect. We argue that the model has a dx2−y2-wave superconducting ground state. The critical temperature (Tc) and the O-isotope effect coefficient (αO) versus hole density (x) are in qualitative agreement with experiments for the cuprates. The minimum (maximum) of αO(Tc) at optimal doping is caused by a large peak in the density of states of holes dressed by AF fluctuations, as discussed in previous van Hove scenarios.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
Similar papers
Influence of electron-phonon interaction on spin-fluctuation-induced superconductivity
similarity 0.96T. S. Nunner et al.
Source status unknown — claims are unverified
Prediction of decoupling in high-temperature superconductors
similarity 0.96Paul P. Durand & Lyle H. Ungar
Source status unknown — claims are unverified
Effect of disorder on the resonating-valence-bond model of high-temperature superconductivity: Relationship to experiments
similarity 0.96L. Coffey & D. L. Cox
Source status unknown — claims are unverified
Temperature dependence of the activation energy at low magnetic induction in high-Tc superconductors
similarity 0.96Z. D. Wang et al.
Source status unknown — claims are unverified
Possibility of a common origin to ferroelectricity and superconductivity in oxides
similarity 0.96A. Bussmann-Holder et al.
Source status unknown — claims are unverified
Structural and superconducting properties of R1−xCaxBa2Cu3O7−δ with 0.50>~x>~0.00
similarity 0.96A. Sedky et al.
Source status unknown — claims are unverified