Atomically-resolved interlayer charge ordering and its interplay with superconductivity in YBa2Cu3O6.81

Chun-Chih Hsu, Bo-Chao Huang, Michael Schnedler, Ming-Yu Lai, Yuh-Lin Wang, Rafal E. Dunin-Borkowski, Chia-Seng Chang, Ting-Kuo Lee, Philipp Ebert () and Ya-Ping Chiu ()
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Chun-Chih Hsu: National Taiwan University
Bo-Chao Huang: Institute of Atomic and Molecular Sciences, Academia Sinica
Michael Schnedler: Peter Grünberg Institut, Forschungszentrum Jülich GmbH
Ming-Yu Lai: Institute of Atomic and Molecular Sciences, Academia Sinica
Yuh-Lin Wang: National Taiwan University
Rafal E. Dunin-Borkowski: Peter Grünberg Institut, Forschungszentrum Jülich GmbH
Chia-Seng Chang: Institute of Physics, Academia Sinica
Ting-Kuo Lee: National Sun Yat-sen University
Philipp Ebert: Peter Grünberg Institut, Forschungszentrum Jülich GmbH
Ya-Ping Chiu: National Taiwan University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract High-temperature superconductive (SC) cuprates exhibit not only a SC phase, but also competing orders, suppressing superconductivity. Charge order (CO) has been recognized as an important competing order, but its microscopic spatial interplay with SC phase as well as the interlayer coupling in CO and SC phases remain elusive, despite being essential for understanding the physical mechanisms of competing orders and hence superconductivity. Here we report the achievement of direct real-space imaging with atomic-scale resolution of cryogenically cleaved YBa2Cu3O6.81 using cross-sectional scanning tunneling microscopy/spectroscopy. CO nanodomains are found embedded in the SC phase with a proximity-like boundary region characterized by mutual suppression of CO and superconductivity. Furthermore, SC coherence as well as CO occur on both CuO chain and plane layers, revealing carrier transport and density of states mixing between layers. The CO antiphase correlation along the c direction suggests a dominance of Coulomb repulsion over Josephson tunneling between adjacent layers.

Date: 2021
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DOI: 10.1038/s41467-021-24003-0

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