Nodeless High-Tc Superconductivity in the Highly Overdoped CuO2 Monolayer

Jiang, Kun; Wu, Xianxin; Hu, Jiangping; Wang, Ziqiang

doi:10.1103/physrevlett.121.227002

Nodeless High- $T_{c}$ Superconductivity in the Highly Overdoped ${CuO}_{2}$ Monolayer

Journal Article · Thu Nov 29 00:00:00 EST 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.121.227002· OSTI ID:1610432

Jiang, Kun ^[1]; Wu, Xianxin ^[2]; Hu, Jiangping ^[3]; Wang, Ziqiang ^[4]

Boston College, Chestnut Hill, MA (United States); Chinese Academy of Sciences (CAS), Beijing (China); DOE/OSTI
Chinese Academy of Sciences (CAS), Beijing (China); Julius-Maximilians-Univ. Würzburg (Germany)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Boston College, Chestnut Hill, MA (United States)

We study the electronic structure and superconductivity in a CuO₂ monolayer grown recently on the d-wave cuprate superconductor Bi₂Sr₂CaCu₂O_8+δ. Density functional theory calculations indicate a significant charge transfer across the interface such that the CuO₂ monolayer is heavily overdoped into the hole-rich regime yet inaccessible in bulk cuprates. We show that both the Cu d_x²–y² and d_3z²–r² orbitals become important and the Fermi surface contains one electron and one hole pocket associated with the two orbitals, respectively. Constructing a minimal correlated two-orbital model for the e_g complex, we show that the spin-orbital exchange interactions produce a nodeless superconductor with extended s-wave pairing symmetry and a pairing energy gap comparable to the bulk d-wave gap, in agreement with recent experiments. Here, the findings point to a direction of realizing new high-T_c superconductors in ozone grown transition-metal-oxide monolayer heterostructures.

View Accepted Manuscript (DOE)

Research Organization:: Boston College, Chestnut Hill, MA (United States)

Sponsoring Organization:: NSF; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: FG02-99ER45747

OSTI ID:: 1610432

Alternate ID(s):: OSTI ID: 1483921

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 22 Vol. 121; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Figures / Tables (3)

FIG. 1(p. 2)

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FIG. 3(p. 5)

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Nodeless High- Tc Superconductivity in the Highly Overdoped CuO2 Monolayer

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