Non-Zhang-Rice Singlet Character of the First Ionization State of T-CuO

Adolphs, Clemens P. J.; Moser, Simon; Sawatzky, G. A.; Berciu, Mona

doi:10.1103/physrevlett.116.087002

Cited by 27 publications

(18 citation statements)

References 34 publications

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“…The square structure and the in-plane lattice constant are consistent with those of the CuO 2 plane in bulk Bi-2212. For rocksalt-structured tetragonal CuO (T-CuO) [5][6][7], a √ 2× √ 2 surface reconstruction might blur half Cu ions and lead to the same lattice constant. However, the identification of the films as CuO 2 is sustained by a large separation of 2.35 eV between the Fermi level (E F ) and the valence band of T-CuO [6], while the corresponding value here is only 1.40 eV ( Fig.…”

Section: Methodsmentioning

confidence: 99%

Nodeless pairing in superconducting copper-oxide monolayer films on Bi2Sr2CaCu2O8+

et al. 2016

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The pairing mechanism of high-temperature superconductivity in cuprates remains the biggest unresolved mystery in condensed matter physics. To solve the problem, one of the most effective approaches is to investigate directly the superconducting CuO 2 layers. Here, by growing CuO 2 monolayer films on Bi 2 Sr 2 CaCu 2 O 8+δ substrates, we identify two distinct and spatially separated energy gaps centered at the Fermi energy, a smaller U-like gap and a larger V-like gap on the films, and study their interactions with alien atoms by low-temperature scanning tunneling microscopy. The newly discovered U-like gap exhibits strong phase coherence and is immune to scattering by K, Cs and Ag atoms, suggesting its nature as a nodeless superconducting gap in the CuO 2 layers, whereas the V-like gap agrees with the well-known pseudogap state in the underdoped regime. Our results support an s-wave superconductivity in Bi 2 Sr 2 CaCu 2 O 8+δ , which, we propose, originates from the modulation-doping resultant two-dimensional hole liquid confined in the CuO 2 layers.

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Section: Methodsmentioning

confidence: 99%

Nodeless pairing in superconducting copper-oxide monolayer films on Bi2Sr2CaCu2O8+

et al. 2016

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“…Intriguingly, the CuO 2 planes responsible for the exotic properties of high-T c cuprate superconductors have the Lieb lattice structure. Thus a Hubbard model on the Lieb lattice [34][35][36] is a natural, and possibly indispensable [37][38][39], extension of the single-band Hubbard model more commonly used [40].…”

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confidence: 99%

Geometric Origin of Superfluidity in the Lieb-Lattice Flat Band

et al. 2016

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The ground state and transport properties of the Lieb lattice flat band in the presence of an attractive Hubbard interaction are considered. It is shown that the superfluid weight can be large even for an isolated and strictly flat band. Moreover the superfluid weight is proportional to the interaction strength and to the quantum metric, a band structure quantity derived solely from the flat-band Bloch functions. These predictions are amenable to verification with ultracold gases and may explain the anomalous behaviour of the superfluid weight of high-Tc superconductors.

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“…For example, in the holedoped case, the spins giving rise to the spin-fluctuation interaction are located on the Cu sublattice, while the paired holes are moving on the O p x/y sublattice. This situation can produce a different physical picture than if the interaction and the pairs both originate from the same orbital on the same lattice [9][10][11][12][13] . And indeed, studies have observed two-particle behavior in a two sublattice system that is not observed in a one-lattice system 14 .…”

Section: Introductionmentioning

confidence: 99%

Orbital structure of the effective pairing interaction in the high-temperature superconducting cuprates

et al. 2021

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The nature of the effective interaction responsible for pairing in the high-temperature superconducting cuprates remains unsettled. This question has been studied extensively using the simplified single-band Hubbard model, which does not explicitly consider the orbital degrees of freedom of the relevant CuO2 planes. Here, we use a dynamical cluster quantum Monte Carlo approximation to study the orbital structure of the pairing interaction in the three-band Hubbard model, which treats the orbital degrees of freedom explicitly. We find that the interaction predominately acts between neighboring copper orbitals, but with significant additional weight appearing on the surrounding bonding molecular oxygen orbitals. By explicitly comparing these results to those from the simpler single-band Hubbard model, our study provides strong support for the single-band framework for describing superconductivity in the cuprates.

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Non-Zhang-Rice Singlet Character of the First Ionization State of T-CuO

Cited by 27 publications

References 34 publications

Nodeless pairing in superconducting copper-oxide monolayer films on Bi2Sr2CaCu2O8+

Nodeless pairing in superconducting copper-oxide monolayer films on Bi2Sr2CaCu2O8+

Geometric Origin of Superfluidity in the Lieb-Lattice Flat Band

Orbital structure of the effective pairing interaction in the high-temperature superconducting cuprates

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