Role of correlations in Ruddlesden-Popper bilayer nickelates under compressive strain
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866914015268044800 |
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| author | Bleys, Logan Corkill, Nicholas Zhao, Yi-Feng Pascut, Gheorghe Lucian LaBollita, Harrison Botana, Antia S. Quader, Khandker F. |
| author_facet | Bleys, Logan Corkill, Nicholas Zhao, Yi-Feng Pascut, Gheorghe Lucian LaBollita, Harrison Botana, Antia S. Quader, Khandker F. |
| contents | The recent discovery of superconductivity in thin films of the bilayer Ruddlesden-Popper (RP) nickelate La$_3$Ni$_2$O$_7$ (La327) under compressive strain has generated enormous interest, opening up further opportunities to stabilize superconductivity in this class of materials at ambient pressure. To better understand the many-body normal state from which superconductivity arises, it is important to ascertain the nature and role of correlations in its electronic structure. To provide insights into this question, we use a fully charge self-consistent DFT+e-DMFT (eDMFT) approach to study La327 at several compressive strain levels. At the strain level where superconductivity has been observed experimentally (-2\%), in contrast with DFT and DFT+$U$ results, the so-called $γ$ pocket emerges and the associated band, of mostly $d_{z^2}$ character, crosses the Fermi level exhibiting `flat band''-like features when dynamical correlations are included. Larger strain levels suppress the $γ$ pocket, which may have implications for superconductivity or its pairing symmetry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_00940 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Role of correlations in Ruddlesden-Popper bilayer nickelates under compressive strain Bleys, Logan Corkill, Nicholas Zhao, Yi-Feng Pascut, Gheorghe Lucian LaBollita, Harrison Botana, Antia S. Quader, Khandker F. Strongly Correlated Electrons Superconductivity The recent discovery of superconductivity in thin films of the bilayer Ruddlesden-Popper (RP) nickelate La$_3$Ni$_2$O$_7$ (La327) under compressive strain has generated enormous interest, opening up further opportunities to stabilize superconductivity in this class of materials at ambient pressure. To better understand the many-body normal state from which superconductivity arises, it is important to ascertain the nature and role of correlations in its electronic structure. To provide insights into this question, we use a fully charge self-consistent DFT+e-DMFT (eDMFT) approach to study La327 at several compressive strain levels. At the strain level where superconductivity has been observed experimentally (-2\%), in contrast with DFT and DFT+$U$ results, the so-called $γ$ pocket emerges and the associated band, of mostly $d_{z^2}$ character, crosses the Fermi level exhibiting `flat band''-like features when dynamical correlations are included. Larger strain levels suppress the $γ$ pocket, which may have implications for superconductivity or its pairing symmetry. |
| title | Role of correlations in Ruddlesden-Popper bilayer nickelates under compressive strain |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2509.00940 |