Superconductivity and Pronounced Electron‐Phonon Coupling in Rock‐Salt Al1−xO1−x and Ti1−xO1−x
Abstract The highest ambient‐pressure Tc among binary compounds is 40 K (MgB2). Higher Tc is achieved in high‐pressure hydrides or multielement cuprates. Alternatively, are explored superconducting properties of binary, metastable sub‐oxides, that may emerge under extremely low oxygen partial pressu...
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Wiley-VCH
2024-11-01
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| Series: | Advanced Electronic Materials |
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| Online Access: | https://doi.org/10.1002/aelm.202400141 |
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| author | Pjotrs Žguns Nuh Gedik Bilge Yildiz Ju Li |
| author_facet | Pjotrs Žguns Nuh Gedik Bilge Yildiz Ju Li |
| author_sort | Pjotrs Žguns |
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| description | Abstract The highest ambient‐pressure Tc among binary compounds is 40 K (MgB2). Higher Tc is achieved in high‐pressure hydrides or multielement cuprates. Alternatively, are explored superconducting properties of binary, metastable sub‐oxides, that may emerge under extremely low oxygen partial pressure. The emphasis is on the rock‐salt structure, which is known to promote superconductivity, and exploring AlO, ScO, TiO, and NbO. Dynamic lattice stability is achieved by introducing metal and oxygen vacancies in the fashion of Nb1−xO1−x‐type structure (x = ¼). The electron‐phonon (e‐ph) coupling is remarkably large in Al1−xO1−x and Ti1−xO1−x (λ ≈ 2 at x = ¼), with Tc ≈ 35 K according to the Allen–Dynes equation. Significantly, the coupling strength is comparable to that in high‐pressure hydrides, yet, in contrast to hydrides and MgB2, the coupling is largely driven by low frequency phonons. Sc1−xO1−x and Nb1−xO1−x show significantly smaller λ and Tc. Further, hydrogen intercalation to boost λ and Tc is investigated. Only Ti1−x(O1−xHx) and Nb1−x(O1−xHx) are dynamically stable upon intercalation, where H, respectively, decreases and increases Tc. The effect of H doping on electronic structure and Tc is discussed. Altogether, the study suggests that metal sub‐oxides are promising compounds to achieve strong e‐ph coupling at ambient pressure. |
| format | Article |
| id | doaj-art-167da1fc390b44f4b909bbdbfe7ed12b |
| institution | Kabale University |
| issn | 2199-160X |
| language | English |
| publishDate | 2024-11-01 |
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| series | Advanced Electronic Materials |
| spelling | doaj-art-167da1fc390b44f4b909bbdbfe7ed12b2024-11-09T18:01:02ZengWiley-VCHAdvanced Electronic Materials2199-160X2024-11-011011n/an/a10.1002/aelm.202400141Superconductivity and Pronounced Electron‐Phonon Coupling in Rock‐Salt Al1−xO1−x and Ti1−xO1−xPjotrs Žguns0Nuh Gedik1Bilge Yildiz2Ju Li3Department of Materials Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139–4307 USADepartment of Physics 77 Massachusetts Avenue Cambridge MA 02139–4307 USADepartment of Materials Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139–4307 USADepartment of Materials Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139–4307 USAAbstract The highest ambient‐pressure Tc among binary compounds is 40 K (MgB2). Higher Tc is achieved in high‐pressure hydrides or multielement cuprates. Alternatively, are explored superconducting properties of binary, metastable sub‐oxides, that may emerge under extremely low oxygen partial pressure. The emphasis is on the rock‐salt structure, which is known to promote superconductivity, and exploring AlO, ScO, TiO, and NbO. Dynamic lattice stability is achieved by introducing metal and oxygen vacancies in the fashion of Nb1−xO1−x‐type structure (x = ¼). The electron‐phonon (e‐ph) coupling is remarkably large in Al1−xO1−x and Ti1−xO1−x (λ ≈ 2 at x = ¼), with Tc ≈ 35 K according to the Allen–Dynes equation. Significantly, the coupling strength is comparable to that in high‐pressure hydrides, yet, in contrast to hydrides and MgB2, the coupling is largely driven by low frequency phonons. Sc1−xO1−x and Nb1−xO1−x show significantly smaller λ and Tc. Further, hydrogen intercalation to boost λ and Tc is investigated. Only Ti1−x(O1−xHx) and Nb1−x(O1−xHx) are dynamically stable upon intercalation, where H, respectively, decreases and increases Tc. The effect of H doping on electronic structure and Tc is discussed. Altogether, the study suggests that metal sub‐oxides are promising compounds to achieve strong e‐ph coupling at ambient pressure.https://doi.org/10.1002/aelm.202400141BCS superconductivityelectron‐phonon couplingsub‐oxides |
| spellingShingle | Pjotrs Žguns Nuh Gedik Bilge Yildiz Ju Li Superconductivity and Pronounced Electron‐Phonon Coupling in Rock‐Salt Al1−xO1−x and Ti1−xO1−x Advanced Electronic Materials BCS superconductivity electron‐phonon coupling sub‐oxides |
| title | Superconductivity and Pronounced Electron‐Phonon Coupling in Rock‐Salt Al1−xO1−x and Ti1−xO1−x |
| title_full | Superconductivity and Pronounced Electron‐Phonon Coupling in Rock‐Salt Al1−xO1−x and Ti1−xO1−x |
| title_fullStr | Superconductivity and Pronounced Electron‐Phonon Coupling in Rock‐Salt Al1−xO1−x and Ti1−xO1−x |
| title_full_unstemmed | Superconductivity and Pronounced Electron‐Phonon Coupling in Rock‐Salt Al1−xO1−x and Ti1−xO1−x |
| title_short | Superconductivity and Pronounced Electron‐Phonon Coupling in Rock‐Salt Al1−xO1−x and Ti1−xO1−x |
| title_sort | superconductivity and pronounced electron phonon coupling in rock salt al1 xo1 x and ti1 xo1 x |
| topic | BCS superconductivity electron‐phonon coupling sub‐oxides |
| url | https://doi.org/10.1002/aelm.202400141 |
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