Work

Decrease of d -wave pairing strength in spite of the persistence of magnetic excitations in the overdoped Hubbard model

Year: 2017

Type: article

Abstract: Evidence for the presence of high-energy magnetic excitations in overdoped ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ (LSCO) has raised questions regarding the role of spin fluctuations in the pairing mechanism. If they remain present in overdoped LSCO, why does ${T}_{c}$ decrease in this doping regime? Here, using results for the dynamic spin susceptibility $\mathrm{Im}\ensuremath{\chi}(\mathbit{q},\ensuremath{\omega})$ obtained from a determinantal quantum Monte Carlo calculation for the Hubbard model, we address this question. We find that while high-energy magnetic excitations persist in the overdoped regime, they lack the momentum to scatter pairs between the antinodal regions. It is the decrease in the spectral weight at large momentum transfer, not observed by resonant inelastic x-ray scattering, which leads to a reduction in the $d$-wave spin-fluctuation pairing strength.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.96.020503

Authors: Edwin W. Huang, Douglas J. Scalapino, Thomas A. Maier, Brian Moritz, Thomas P. Devereaux

Institutions: SLAC National Accelerator Laboratory, Stanford University

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, Stanford University, Basic Energy Sciences

Award: G303061748