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

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

doi:10.1103/PhysRevB.96.020503

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

Journal Article · Mon Jul 17 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.020503· OSTI ID:1374383

Huang, Edwin W. ^[1]; Scalapino, Douglas J. ^[2];

^[3]; Moritz, Brian ^[1]; Devereaux, Thomas P. ^[1]

SLAC National Accelerator Lab., and Stanford Univ., Menlo Park, CA (United States)
Univ. of California, Santa Barbara, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Evidence for the presence of high-energy magnetic excitations in overdoped La_2–xSr_xCuO₄ (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 Imχ(q,ω) 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. Finally, 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.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515; AC05-00OR22725

OSTI ID:: 1374383

Alternate ID(s):: OSTI ID: 1371606; OSTI ID: 1407784

Journal Information:: Physical Review B, Vol. 96, Issue 2; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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References (20)

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