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DOE OSTI · 2565499

Beyond-Hubbard Pairing in a Cuprate Ladder

Padma, Hari (ORCID:0000000306821849)·Thomas, Jinu (ORCID:0000000348186660)·TenHuisen, Sophia F. R. (ORCID:0000000243797035)·He, Wei (ORCID:0000000335223899)·Guan, Ziqiang (ORCID:0000000210976766)·Li, Jiemin (ORCID:0000000271536123)·Lee, Byungjune (ORCID:000000030785030X)·Wang, Yu·Lee, Seng Huat (ORCID:0000000342543460)·Mao, Zhiqiang (ORCID:0000000249203293)·Jang, Hoyoung (ORCID:0000000271609038)·Bisogni, Valentina (ORCID:0000000273999930)·Pelliciari, Jonathan (ORCID:0000000315087746)·Dean, Mark P. M. (ORCID:0000000151393543)·Johnston, Steven (ORCID:0000000223430113)·Mitrano, Matteo (ORCID:0000000201020391)
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Abstract

The Hubbard model is believed to capture the essential physics of cuprate superconductors. However, recent theoretical studies suggest that it fails to reproduce a robust and homogeneous superconducting ground state. Here, using resonant inelastic x-ray scattering and density matrix renormalization group calculations, we show that magnetic excitations in the prototypical cuprate ladder Sr 14 Cu 24 O 41 are inconsistent with those of a simple Hubbard model. The magnetic response of hole carriers, contributing to an emergent branch of spin-flip excitations, is strongly suppressed. This effect is the consequence of strong d -wavelike pairing, enhanced by nearly an order of magnitude through a large nearest-neighbor attractive interaction and persisting up to at least 260 K. The close connection between the physics of cuprate ladders and that of the two-dimensional compounds suggests that such an enhanced hole pairing may be a universal feature of superconducting cuprates. Published by the American Physical Society 2025

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75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYCupratesResonant inelastic x-ray scatteringSpin fluctuationsStrongly correlated systemsSuperconductivity

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Padma, Hari (ORCID:0000000306821849), Thomas, Jinu (ORCID:0000000348186660), TenHuisen, Sophia F. R. (ORCID:0000000243797035), He, Wei (ORCID:0000000335223899), Guan, Ziqiang (ORCID:0000000210976766), Li, Jiemin (ORCID:0000000271536123), Lee, Byungjune (ORCID:000000030785030X), Wang, Yu, Lee, Seng Huat (ORCID:0000000342543460), Mao, Zhiqiang (ORCID:0000000249203293), Jang, Hoyoung (ORCID:0000000271609038), Bisogni, Valentina (ORCID:0000000273999930), Pelliciari, Jonathan (ORCID:0000000315087746), Dean, Mark P. M. (ORCID:0000000151393543), Johnston, Steven (ORCID:0000000223430113), Mitrano, Matteo (ORCID:0000000201020391). 2025-05-12. Beyond-Hubbard Pairing in a Cuprate Ladder. https://doi.org/10.1103/physrevx.15.021049

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