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Hard antinodal gap revealed by quantum oscillations in the pseudogap regime of underdoped high-T$_{c}$ superconductors

Hartstein, Máté; Hsu, Yu-Te; Modic, Kimberly A.; Porras, Juan; Loew, Toshinao; Tacon, Matthieu Le; Zuo, Huakun; Wang, Jinhua; Zhu, Zengwei; Chan, Mun K.; McDonald, Ross D.; Lonzarich, Gilbert G.; Keimer, Bernhard; Sebastian, Suchitra E.; Harrison, Neil

Abstract (englisch):
An understanding of the missing antinodal electronic excita-tions in the pseudogap state is essential for uncovering the physics of the underdoped cuprate high-temperature super-conductors. The majority of high-temperature experiments performed thus far, however, have been unable to discern whether the antinodal states are rendered unobservable due to their damping or whether they vanish due to their gap-ping. Here, we distinguish between these two scenarios by using quantum oscillations to examine whether the small Fermi surface pocket, found to occupy only 2% of the Brillouin zone in the underdoped cuprates, exists in isolation against a majority of completely gapped density of states spanning the antinodes, or whether it is thermodynamically coupled to a background of ungapped antinodal states. We find that quantum oscillations associated with the small Fermi surface pocket exhibit a signature sawtooth waveform characteristic of an isolated two-dimensional Fermi surface pocket. This finding reveals that the antinodal states are destroyed by a hard gap that extends over the majority of the Brillouin zone, placing strong constraints on a drastic underlying origin of quasiparticle disappearance over almost the entire Brillouin zone in the pseudogap regime.

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DOI: 10.1038/s41567-020-0910-0
Zitationen: 2
Web of Science
Zitationen: 2
Zitationen: 3
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 05.2020
Sprache Englisch
Identifikator ISSN: 1745-2473, 1745-2481
KITopen-ID: 1000119751
HGF-Programm 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Nature physics
Verlag Nature Research
Band 16
Seiten 841–847
Vorab online veröffentlicht am 25.05.2020
Nachgewiesen in Scopus
Web of Science
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