Electronic band sculpted by oxygen vacancies and indispensable for dilute superconductivity
Dilute superconductivity survives in bulk strontium titanate when the Fermi temperature falls well below the Debye temperature. Here, we show that the onset of the superconducting dome is dopant dependent. When mobile electrons are introduced by removing oxygen atoms, the superconducting transition...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2023-08-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.5.033080 |
| _version_ | 1827285216463421440 |
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| author | Benoît Fauqué Clément Collignon Hyeok Yoon Ravi Xiao Lin Igor I. Mazin Harold Y. Hwang Kamran Behnia |
| author_facet | Benoît Fauqué Clément Collignon Hyeok Yoon Ravi Xiao Lin Igor I. Mazin Harold Y. Hwang Kamran Behnia |
| author_sort | Benoît Fauqué |
| collection | DOAJ |
| description | Dilute superconductivity survives in bulk strontium titanate when the Fermi temperature falls well below the Debye temperature. Here, we show that the onset of the superconducting dome is dopant dependent. When mobile electrons are introduced by removing oxygen atoms, the superconducting transition survives down to 2×10^{17}cm^{−3}, but when they are brought by substituting Ti with Nb, the threshold density for superconductivity is an order of magnitude higher. Our study of quantum oscillations reveals a difference in the band dispersion between the dilute metals made by these doping routes and our band calculations demonstrate that the rigid band approximation does not hold when mobile electrons are introduced by oxygen vacancies. We identify the band sculpted by these vacancies as the exclusive locus of superconducting instability in the ultradilute limit. |
| first_indexed | 2024-04-24T10:11:14Z |
| format | Article |
| id | doaj.art-f46d75c5f70145e6aadcb8ed7e14810f |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:11:14Z |
| publishDate | 2023-08-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-f46d75c5f70145e6aadcb8ed7e14810f2024-04-12T17:32:58ZengAmerican Physical SocietyPhysical Review Research2643-15642023-08-015303308010.1103/PhysRevResearch.5.033080Electronic band sculpted by oxygen vacancies and indispensable for dilute superconductivityBenoît FauquéClément CollignonHyeok YoonRaviXiao LinIgor I. MazinHarold Y. HwangKamran BehniaDilute superconductivity survives in bulk strontium titanate when the Fermi temperature falls well below the Debye temperature. Here, we show that the onset of the superconducting dome is dopant dependent. When mobile electrons are introduced by removing oxygen atoms, the superconducting transition survives down to 2×10^{17}cm^{−3}, but when they are brought by substituting Ti with Nb, the threshold density for superconductivity is an order of magnitude higher. Our study of quantum oscillations reveals a difference in the band dispersion between the dilute metals made by these doping routes and our band calculations demonstrate that the rigid band approximation does not hold when mobile electrons are introduced by oxygen vacancies. We identify the band sculpted by these vacancies as the exclusive locus of superconducting instability in the ultradilute limit.http://doi.org/10.1103/PhysRevResearch.5.033080 |
| spellingShingle | Benoît Fauqué Clément Collignon Hyeok Yoon Ravi Xiao Lin Igor I. Mazin Harold Y. Hwang Kamran Behnia Electronic band sculpted by oxygen vacancies and indispensable for dilute superconductivity Physical Review Research |
| title | Electronic band sculpted by oxygen vacancies and indispensable for dilute superconductivity |
| title_full | Electronic band sculpted by oxygen vacancies and indispensable for dilute superconductivity |
| title_fullStr | Electronic band sculpted by oxygen vacancies and indispensable for dilute superconductivity |
| title_full_unstemmed | Electronic band sculpted by oxygen vacancies and indispensable for dilute superconductivity |
| title_short | Electronic band sculpted by oxygen vacancies and indispensable for dilute superconductivity |
| title_sort | electronic band sculpted by oxygen vacancies and indispensable for dilute superconductivity |
| url | http://doi.org/10.1103/PhysRevResearch.5.033080 |
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