Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO_{3}
In many unconventional superconductors, the presence of a pseudogap—a suppression in the electronic density of states extending above the critical temperature—has been a long-standing mystery. Here, we employ combined in situ electrical transport and angle-resolved photoemission spectroscopy measure...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2021-06-01
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| Series: | Physical Review X |
| Online Access: | http://doi.org/10.1103/PhysRevX.11.021054 |
| _version_ | 1818994383450537984 |
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| author | B. D. Faeth S.-L. Yang J. K. Kawasaki J. N. Nelson P. Mishra C. T. Parzyck C. Li D. G. Schlom K. M. Shen |
| author_facet | B. D. Faeth S.-L. Yang J. K. Kawasaki J. N. Nelson P. Mishra C. T. Parzyck C. Li D. G. Schlom K. M. Shen |
| author_sort | B. D. Faeth |
| collection | DOAJ |
| description | In many unconventional superconductors, the presence of a pseudogap—a suppression in the electronic density of states extending above the critical temperature—has been a long-standing mystery. Here, we employ combined in situ electrical transport and angle-resolved photoemission spectroscopy measurements to reveal an unprecedentedly large pseudogap regime in single-layer FeSe/SrTiO_{3}, an interfacial superconductor where incoherent Cooper pairs are initially formed above T_{Δ}≈60 K but where a zero-resistance state is achieved only below T_{0}<30 K. We show that this behavior is accompanied by distinct transport signatures of two-dimensional phase fluctuating superconductivity, suggesting a mixed vortex state hosting incoherent Cooper pairs which persist well above the maximum clean limit T_{c} of approximately 40 K. Our work establishes the critical role of reduced dimensionality in driving the complex interplay between Cooper pairing and phase coherence in two-dimensional high-T_{c} superconductors, providing a paradigm for understanding and engineering higher-T_{c} interfacial superconductors. |
| first_indexed | 2024-12-20T20:57:05Z |
| format | Article |
| id | doaj.art-c191803f07df4fe5bc9cf47d73c498b5 |
| institution | Directory Open Access Journal |
| issn | 2160-3308 |
| language | English |
| last_indexed | 2024-12-20T20:57:05Z |
| publishDate | 2021-06-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review X |
| spelling | doaj.art-c191803f07df4fe5bc9cf47d73c498b52022-12-21T19:26:48ZengAmerican Physical SocietyPhysical Review X2160-33082021-06-0111202105410.1103/PhysRevX.11.021054Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO_{3}B. D. FaethS.-L. YangJ. K. KawasakiJ. N. NelsonP. MishraC. T. ParzyckC. LiD. G. SchlomK. M. ShenIn many unconventional superconductors, the presence of a pseudogap—a suppression in the electronic density of states extending above the critical temperature—has been a long-standing mystery. Here, we employ combined in situ electrical transport and angle-resolved photoemission spectroscopy measurements to reveal an unprecedentedly large pseudogap regime in single-layer FeSe/SrTiO_{3}, an interfacial superconductor where incoherent Cooper pairs are initially formed above T_{Δ}≈60 K but where a zero-resistance state is achieved only below T_{0}<30 K. We show that this behavior is accompanied by distinct transport signatures of two-dimensional phase fluctuating superconductivity, suggesting a mixed vortex state hosting incoherent Cooper pairs which persist well above the maximum clean limit T_{c} of approximately 40 K. Our work establishes the critical role of reduced dimensionality in driving the complex interplay between Cooper pairing and phase coherence in two-dimensional high-T_{c} superconductors, providing a paradigm for understanding and engineering higher-T_{c} interfacial superconductors.http://doi.org/10.1103/PhysRevX.11.021054 |
| spellingShingle | B. D. Faeth S.-L. Yang J. K. Kawasaki J. N. Nelson P. Mishra C. T. Parzyck C. Li D. G. Schlom K. M. Shen Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO_{3} Physical Review X |
| title | Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO_{3} |
| title_full | Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO_{3} |
| title_fullStr | Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO_{3} |
| title_full_unstemmed | Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO_{3} |
| title_short | Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO_{3} |
| title_sort | incoherent cooper pairing and pseudogap behavior in single layer fese srtio 3 |
| url | http://doi.org/10.1103/PhysRevX.11.021054 |
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