Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO3

Incoherent Cooper Pairing and Pseudogap Behavior in Single-Layer FeSe/SrTiO3

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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Veröffentlicht in:Physical review. X 2021-06, Vol.11 (2)
Hauptverfasser: Faeth, B D, S.-L. Yang, Kawasaki, J K, Nelson, J N, Mishra, P, Parzyck, C T, C. Li, Schlom, D G, Shen, K M
Format: Artikel
Sprache:eng
Schlagworte:
Cooper pairs
Density of states
Electron states
High temperature superconductors
Iron
Phase coherence
Photoelectric emission
Photoelectron spectroscopy
Signatures
Spectroscopic analysis
Spectrum analysis
Strontium titanates
Superconductivity
Temperature
Transition temperature
Transport properties
Unconventional superconductors
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Zusammenfassung: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-layerFeSe/SrTiO3, an interfacial superconductor where incoherent Cooper pairs are initially formed aboveTΔ≈60Kbut where a zero-resistance state is achieved only belowT0
ISSN:2160-3308
DOI:10.1103/PhysRevX.11.021054