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...
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2021-06-01
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Series: | Physical Review X |
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doaj-c191803f07df4fe5bc9cf47d73c498b52021-06-10T18:46:40ZengAmerican 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 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
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 |
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 |
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 |
title |
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_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_sort |
incoherent cooper pairing and pseudogap behavior in single-layer fese/srtio_{3} |
publisher |
American Physical Society |
series |
Physical Review X |
issn |
2160-3308 |
publishDate |
2021-06-01 |
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. |
url |
http://doi.org/10.1103/PhysRevX.11.021054 |
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