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Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTi O3

Faeth, BD and Yang, S-L and Kawasaki, JK and Nelson, JN and Mishra, P and Parzyck, CT and Li, C and Schlom, DG and Shen, KM (2021) Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTi O3. In: Physical Review X, 11 (2).

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Official URL: https://doi.org/10.1103/PhysRevX.11.021054


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/SrTiO3, an interfacial superconductor where incoherent Cooper pairs are initially formed above T��60 K but where a zero-resistance state is achieved only below T0<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 Tc 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-Tc superconductors, providing a paradigm for understanding and engineering higher-Tc interfacial superconductors. © 2021 authors. Published by the American Physical Society.

Item Type: Journal Article
Publication: Physical Review X
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to Authors
Keywords: Electric resistance; Photoelectron spectroscopy, Angle resolved photoemission spectroscopy; Cooper pairing; Critical temperatures; Electrical transport; High Tc superconductors; Phase coherence; Unconventional superconductors; Zero-resistance state, High temperature superconductors
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 01 Sep 2021 11:03
Last Modified: 01 Sep 2021 11:03
URI: http://eprints.iisc.ac.in/id/eprint/69429

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