Electronic structure of bilayer cuprate superconductors

Lan, Yu; Qin, Jihong; Feng, Shiping

doi:10.1016/j.physb.2007.10.084

Cited by 2 publications

(1 citation statement)

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“…The rare-earth d bands are displaced to roughly 0.5 eV above the Fermi level. A splitting between the three Nid x 2 −y 2 bands is observed at X as a consequence of interlayer hopping similar to that in multilayer cuprates [30]. The corresponding Fermi surface (shown in Fig.…”

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confidence: 56%

Theoretical investigation of superconductivity in trilayer square-planar nickelates

Nica,

Krishna,

et al. 2020

Preprint

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The discovery of superconductivity in Sr-doped NdNiO2 is a crucial breakthrough in the long pursuit for nickel oxide materials with electronic and magnetic properties similar to those of the cuprates. NdNiO2 is the infinite-layer member of a family of square-planar nickelates with general chemical formula Rn+1NinO2n+2 (R = La, Pr, Nd, n = 2, 3, ...∞). In this letter, we investigate superconductivity in the trilayer member of this series (R4Ni3O8) using a combination of first-principles and t − J model calculations. R4Ni3O8 compounds resemble cuprates more than RNiO2 materials in that only Ni-d x 2 −y 2 bands cross the Fermi level, they exhibit a largely reduced charge transfer energy, and as a consequence superexchange interactions are significantly enhanced. We find that the superconducting instability in doped R4Ni3O8 compounds is considerably stronger with a maximum gap about four times larger than that in Sr0.2Nd0.8NiO2.

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confidence: 56%