超导铜氧化物/锰氧化物界面处的关联增强磁性
Correlation enhanced magnetism at a superconducting cuprate/manganite interface
- Universidade Federal de Minas Gerais（米纳斯吉拉斯联邦大学）
- Université Paris-Saclay（巴黎萨克雷大学）
- Instituto de Física, Universidade de São Paulo（圣保罗大学物理研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究通过团簇动力学平均场理论发现，在强关联的铜氧化物/锰氧化物界面，超导性可增强界面磁性，而非抑制之。
AI中文摘要：
受铜氧化物-锰氧化物异质结构实验研究的启发，我们研究了欠掺杂铜氧化物区域中受局域界面交换场作用的关联双层哈伯德模型，并使用团簇动力学平均场理论进行分析。我们发现超导性与锰氧化物诱导的铜自旋极化共存。值得注意的是，在整个共存区域内，超导解携带的磁矩大于相应约束正常态的磁矩。对磁响应的分析表明，这种反转由关联驱动，关联在正常态中已经增强磁性，在超导解中增强得更强。在更强的交换场下，超导性突然崩溃，表现出与一级相变一致的滞后现象，并出现强自旋极化的赝能隙。这些结果表明，在强电子关联下，超导性可以增强而非抑制界面磁性。
英文摘要：
Motivated by experimental studies on cuprate-manganite heterostructures, we study a correlated bilayer Hubbard model subject to a local interfacial exchange field using cluster dynamical mean-field theory in the underdoped cuprate regime. We find that superconductivity coexists with a manganite-induced Cu spin polarization. Remarkably, throughout this coexistence regime, the superconducting solution carries a larger magnetic moment than the corresponding constrained normal state. Analysis of the magnetic response shows that this reversal is driven by correlations, which enhance magnetism already in the normal state and even more strongly in the superconducting solution. At stronger exchange fields, superconductivity collapses abruptly, displaying hysteresis consistent with a first-order transition, and a strongly spin-polarized pseudogap emerges. These results show that, under strong electronic correlations, superconductivity can enhance rather than suppress interfacial magnetism.
