Orbital-order as the driving mechanism for superconductivity in ruthenates
Abstract Several materials transition from an insulating to a superconducting state by reducing the strength of the electron-phonon coupling associated with charge and bond orderings provided that the coupling remains strong enough to produce Cooper pairs. While the Jahn-Teller effect is at the core...
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| Format: | Article |
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Nature Portfolio
2025-02-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-56417-5 |
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| author | Álvaro Adrián Carrasco Álvarez Sébastien Petit Wilfrid Prellier Manuel Bibes Julien Varignon |
| author_facet | Álvaro Adrián Carrasco Álvarez Sébastien Petit Wilfrid Prellier Manuel Bibes Julien Varignon |
| author_sort | Álvaro Adrián Carrasco Álvarez |
| collection | DOAJ |
| description | Abstract Several materials transition from an insulating to a superconducting state by reducing the strength of the electron-phonon coupling associated with charge and bond orderings provided that the coupling remains strong enough to produce Cooper pairs. While the Jahn-Teller effect is at the core of a strong electron-phonon coupling producing insulating states and orbital and bond orderings, its implication in superconductivity remains unobserved. Here, with parameter-free first-principles calculations, we reveal that superconductivity in A2RuO4 (A = Sr, Ca) emerges due to an electron-phonon mechanism associated with the proximity of an orbital and bond-ordered phase. The model predicts critical temperatures T c of 0.5–1.65 K in bulk Sr2RuO4 and 63–73 K in pressured Ca2RuO4, in agreement with experiments. Our results suggest that phonons strongly coupled to electrons, such as those involved in charge disproportionation or Jahn-Teller effects and inducing band gaps in various oxides, could also serve as mediators of Cooper pairs in metallic phases. |
| format | Article |
| id | doaj-art-a36b30e57d4a47079c267a2174bdf1dd |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-a36b30e57d4a47079c267a2174bdf1dd2025-02-09T12:43:58ZengNature PortfolioNature Communications2041-17232025-02-011611910.1038/s41467-025-56417-5Orbital-order as the driving mechanism for superconductivity in ruthenatesÁlvaro Adrián Carrasco Álvarez0Sébastien Petit1Wilfrid Prellier2Manuel Bibes3Julien Varignon4Laboratoire CRISMAT, ENSICAEN, CNRS, Université de Caen, Normandie UniversitéLaboratoire CRISMAT, ENSICAEN, CNRS, Université de Caen, Normandie UniversitéLaboratoire CRISMAT, ENSICAEN, CNRS, Université de Caen, Normandie UniversitéLaboratoire Albert Fert—CNRS, Thales, Université Paris SaclayLaboratoire CRISMAT, ENSICAEN, CNRS, Université de Caen, Normandie UniversitéAbstract Several materials transition from an insulating to a superconducting state by reducing the strength of the electron-phonon coupling associated with charge and bond orderings provided that the coupling remains strong enough to produce Cooper pairs. While the Jahn-Teller effect is at the core of a strong electron-phonon coupling producing insulating states and orbital and bond orderings, its implication in superconductivity remains unobserved. Here, with parameter-free first-principles calculations, we reveal that superconductivity in A2RuO4 (A = Sr, Ca) emerges due to an electron-phonon mechanism associated with the proximity of an orbital and bond-ordered phase. The model predicts critical temperatures T c of 0.5–1.65 K in bulk Sr2RuO4 and 63–73 K in pressured Ca2RuO4, in agreement with experiments. Our results suggest that phonons strongly coupled to electrons, such as those involved in charge disproportionation or Jahn-Teller effects and inducing band gaps in various oxides, could also serve as mediators of Cooper pairs in metallic phases.https://doi.org/10.1038/s41467-025-56417-5 |
| spellingShingle | Álvaro Adrián Carrasco Álvarez Sébastien Petit Wilfrid Prellier Manuel Bibes Julien Varignon Orbital-order as the driving mechanism for superconductivity in ruthenates Nature Communications |
| title | Orbital-order as the driving mechanism for superconductivity in ruthenates |
| title_full | Orbital-order as the driving mechanism for superconductivity in ruthenates |
| title_fullStr | Orbital-order as the driving mechanism for superconductivity in ruthenates |
| title_full_unstemmed | Orbital-order as the driving mechanism for superconductivity in ruthenates |
| title_short | Orbital-order as the driving mechanism for superconductivity in ruthenates |
| title_sort | orbital order as the driving mechanism for superconductivity in ruthenates |
| url | https://doi.org/10.1038/s41467-025-56417-5 |
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