Puddle formation, persistent gaps, and non-mean-field breakdown of superconductivity in overdoped (Pb,Bi)2Sr2CuO6+δ

Tromp, Willem O.; Benschop, Tjerk; Ge, Jian‐Feng; Battisti, Irene; Bastiaans, Koen M.; Chatzopoulos, Damianos; Vervloet, Amber; Smit, Steef; Heumen, E. van; Golden, M. S.; Huang, Yingkai; Kondo, Takeshi; Yin, Yilong; Hoffman, Jennifer; Sulangi, Miguel Antonio; Zaanen, Jan; Allan, Milan P.

doi:10.48550/arxiv.2205.09740

Cited by 2 publications

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“…Our results are supported by the recent evidence by a high resolution STM experiment of nanoscale phase separation in a BSCCO sample doped up to 0.27 holes/Cu site [73], reaching the high doping range of the high order VHS singularities, which was predicted by theory to appear where the chemical potential approaches a high order VHS singularity near a Lifshitz transition in strongly correlated multiband systems [46][47][48][49][50]. The position of the Fermi level with respect to the high order VHS peaks can be controlled by the gate voltage using modern technologies.…”

Section: Discussionsupporting

confidence: 89%

Moiré-like Superlattice Generated van Hove Singularities in a Strained CuO2 Double Layer

2022

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While it is known that the double-layer Bi2Sr2CaCu2O8+y (BSCCO) cuprate superconductor exhibits a one-dimensional (1D) incommensurate superlattice (IS), the effect of IS on the electronic structure remains elusive. Following the recent shift of interest from an underdoped phase to optimum and overdoped phases in BSCCO by increasing the hole doping x, controlled by the oxygen interstitials concentration y, here we focus on the multiple splitting of the density of states (DOS) peaks and emergence of higher order van Hove singularities (VHS) due to the 1D incommensurate superlattice. It is known that the 1D incommensurate wave vector q=ϵb (where b is the reciprocal lattice vector of the orthorhombic lattice) is controlled by the misfit strain between different atomic layers in the range 0.209–0.215 in BSCCO and in the range 0.209–0.25 in Bi2Sr2Ca1−xYxCu2O8+y (BSCYCO). This work reports the theoretical calculation of a complex pattern of VHS due to the 1D incommensurate superlattice with large 1D quasi-commensurate supercells with the wave vector ϵ=9/η in the range 36>η>43. The similarity of the complex VHS splitting and appearing of higher order VHS in a mismatched CuO2 bilayer with VHS due to the moiré lattice in strained twisted bilayer graphene is discussed. This makes a mismatched CuO2 bilayer quite promising for constructing quantum devices with tuned physical characteristics.

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Section: Discussionsupporting

confidence: 89%

Moiré-like Superlattice Generated van Hove Singularities in a Strained CuO2 Double Layer

2022

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“…For example, a recent study 55 considering several measures of superconductivity on an overdoped LSCO crystal found strong nanoscale inhomogeneity in STM and an onset of diamagnetism many degrees above the onset of zero resistance, consistent with a theory of granular superconductivity by Spivak et al 56 There is evidence from STM on many Bi-based cuprates of substantial inhomogeneity of local gaps and other properties of these samples. 57,58 Nevertheless, thermodynamic measurements tend to infer much narrower spatial distributions of superconducting properties in the overdoped regions than STM, particularly in the cleaner YBCO material 59,60 (overdoped with Ca). Even in LSCO, sample quality varies dramatically between crystals and thin films of various types, and there is to our knowledge no evidence for gross inhomogeneity in the epitaxially grown films of Ref.…”

Section: B Electronic Inhomogeneitymentioning

confidence: 99%

Effect of realistic out-of-plane dopant potentials on the superfluid density of overdoped cuprates

U.¹,

Mishra²,

R.³

et al. 2022

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Recent experimental papers on hole-doped overdoped cuprates have argued that a series of observations showing unexpected behavior in the superconducting state imply the breakdown of the quasiparticle-based Landau-BCS paradigm in that doping range. In contrast, some of the present authors have argued that a phenomenological "dirty d-wave" theoretical analysis explains essentially all aspects of thermodynamic and transport properties in the superconducting state, provided the unusual effects of weak, out-of-plane dopant impurities are properly accounted for. Here we attempt to place this theory on a more quantitative basis by performing abinitio calculations of dopant impurity potentials for LSCO and Tl-2201. These potentials are more complex than the pointlike impurity models considered previously, and require calculation of forward scattering corrections to transport properties. Including realistic, ARPES-derived bandstructures, Fermi liquid renormalizations, and vertex corrections, we show that the theory can explain semiquantitatively the unusual superfluid density measurements of the two most studied overdoped materials.

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Puddle formation, persistent gaps, and non-mean-field breakdown of superconductivity in overdoped (Pb,Bi)2Sr2CuO6+δ

Cited by 2 publications

References 0 publications

Moiré-like Superlattice Generated van Hove Singularities in a Strained CuO2 Double Layer

Moiré-like Superlattice Generated van Hove Singularities in a Strained CuO2 Double Layer

Effect of realistic out-of-plane dopant potentials on the superfluid density of overdoped cuprates

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