Beyond-Hubbard Pairing in a Cuprate Ladder

IF 11.6 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Physical Review X Pub Date : 2025-05-12 DOI:10.1103/physrevx.15.021049

Hari Padma, Jinu Thomas, Sophia F. R. TenHuisen, Wei He, Ziqiang Guan, Jiemin Li, Byungjune Lee, Yu Wang, Seng Huat Lee, Zhiqiang Mao, Hoyoung Jang, Valentina Bisogni, Jonathan Pelliciari, Mark P. M. Dean, Steven Johnston, Matteo Mitrano

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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 Sr14Cu24O41 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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铜阶梯中的超哈伯德配对

哈伯德模型被认为抓住了铜超导体的基本物理特性。然而，最近的理论研究表明，它不能再现一个稳健和均匀的超导基态。通过共振非弹性x射线散射和密度矩阵重整化群计算，我们发现原型铜阶梯Sr14Cu24O41中的磁激发与简单Hubbard模型中的磁激发不一致。空穴载流子的磁响应，有助于自旋翻转激发的一个紧急分支，被强烈抑制。这种效应是强d波配对的结果，通过一个大的近邻吸引相互作用增强了近一个数量级，并持续到至少260 K。铜阶梯的物理性质与二维化合物的物理性质之间的密切联系表明，这种增强的空穴配对可能是超导铜酸盐的普遍特征。2025年由美国物理学会出版

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review X PHYSICS, MULTIDISCIPLINARY-

CiteScore

24.60

自引率

1.60%

发文量

197

审稿时长

3 months

期刊介绍： Physical Review X (PRX) stands as an exclusively online, fully open-access journal, emphasizing innovation, quality, and enduring impact in the scientific content it disseminates. Devoted to showcasing a curated selection of papers from pure, applied, and interdisciplinary physics, PRX aims to feature work with the potential to shape current and future research while leaving a lasting and profound impact in their respective fields. Encompassing the entire spectrum of physics subject areas, PRX places a special focus on groundbreaking interdisciplinary research with broad-reaching influence.