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PreprintCC BY 4.0arXiv

Correlation enhanced magnetism at a superconducting cuprate/manganite interface

  • Vitor A. M. Lima
  • Marcello Civelli
  • Walber Hugo de Brito
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Abstract

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.

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Cite

BibTeXRIS
BibTeX
@misc{lima2026correlation,
  title = {{Correlation enhanced magnetism at a superconducting cuprate/manganite interface}},
  author = {Vitor A. M. Lima and Marcello Civelli and Walber Hugo de Brito},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.22051},
  eprint = {2609.22051},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.22051},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Correlation enhanced magnetism at a superconducting cuprate/manganite interface
AU  - Vitor A. M. Lima
AU  - Marcello Civelli
AU  - Walber Hugo de Brito
PY  - 2026
DA  - 2026/09/18
PB  - arXiv
DO  - 10.48550/arxiv.2609.22051
UR  - https://arxiv.org/abs/2609.22051
AB  - 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.
ER  -