$Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO_{3}$
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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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Main Authors:	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
Format:	article
Language:	EN
Published:	American Physical Society 2021
Subjects:	Physics QC1-999
Online Access:	https://doaj.org/article/c191803f07df4fe5bc9cf47d73c498b5
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spelling	oai:doaj.org-article:c191803f07df4fe5bc9cf47d73c498b52021-12-02T15:04:41ZIncoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO_{3}10.1103/PhysRevX.11.0210542160-3308https://doaj.org/article/c191803f07df4fe5bc9cf47d73c498b52021-06-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.021054http://doi.org/10.1103/PhysRevX.11.021054https://doaj.org/toc/2160-3308In 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.B. D. FaethS.-L. YangJ. K. KawasakiJ. N. NelsonP. MishraC. T. ParzyckC. LiD. G. SchlomK. M. ShenAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 2, p 021054 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 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}
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.
format	article
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
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
publishDate	2021
url	https://doaj.org/article/c191803f07df4fe5bc9cf47d73c498b5
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Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO_{3}

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