Charge Order versus Superconductivity in Inhomogeneous Systems

Litak, Grzegorz

doi:10.1007/s10948-008-0429-6

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…It means that microscopic theories of superconductivity are incapable of describing specific materials precisely, although together they give an adequate overall picture. In this connection, the failure of the most sophisticated approaches to make any prediction of true or, at least "bare" T c , (provided that the corresponding T c -value is not known a priori) despite hundreds of existing superconductors with varying fascinating properties, forced Phillips [63] to reject all apparently first-principle continuum theories in favor of his own percolative filamentary theory of superconductivity [64][65][66][67] (see also the random attractive Hubbard model studies of superconductivity [68,69] and the analysis of competition between superconductivity and charge density waves studied in the framework of similar scenarios [70][71][72]). We totally agree with such considerations in the sense of the important role of disorder in superconductors with high T c on the verge of crystal lattice instability [73][74][75][76][77][78][79][80][81][82][83].…”

Section: Introductionmentioning

confidence: 99%

Competition of Superconductivity and Charge Density Waves in Cuprates: Recent Evidence and Interpretation

Gabovich

Войтенко

Ekino

et al. 2010

Advances in Condensed Matter Physics

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Explicit and implicit experimental evidence for charge density wave (CDW) presence in high-Tcsuperconducting oxides is analyzed. The theory of CDW superconductors is presented. It is shown that the observed pseudogaps and dip-hump structures in tunnel and photoemission spectra are manifestations of the same CDW gapping of the quasiparticle density of states. Huge pseudogaps are transformed into modest dip-hump structures at low temperatures,T, when the electron spectrum superconducting gapping dominates. Heat capacity jumps at the superconducting critical temperature and the paramagnetic limit are calculated for CDW superconductors. For a certain range of parameters, the CDW state in ad-wave superconductor becomes reentrant withT, the main control quantity being a portion of dielectrcally gapped Fermi surface. It is shown that in the weak-coupling approximation, the ratio between the superconducting gap at zero temperatureΔ(T=0)andTchas the Bardeen-Cooper-Schrieffer value fors-wave Cooper pairing and exceeds the corresponding value ford-wave pairing of CDW superconductors. Thus, large experimentally found values2Δ(T=0)/Tc≈5÷8are easily reproduced with reasonable input parameter values of the model. The conclusion is made that CDWs play a significant role in cuprate superconductivity.

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Section: Introductionmentioning

confidence: 99%

Competition of Superconductivity and Charge Density Waves in Cuprates: Recent Evidence and Interpretation

Gabovich

Войтенко

Ekino

et al. 2010

Advances in Condensed Matter Physics

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Evolution of the charge density wave order on the two-dimensional hexagonal lattice

Litak

Wysokiński

2017

Journal of Magnetism and Magnetic Materials

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First-Principles Prediction of Structural Distortions in the Cuprates and Their Impact on the Electronic Structure

Jin,

Ismail-Beigi

2024

Phys. Rev. X

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Materials-realistic microscopic theoretical descriptions of copper-based superconductors are challenging due to their complex crystal structures combined with strong electron interactions. Here, we demonstrate how density functional theory can accurately describe key structural, electronic, and magnetic properties of the normal state of the prototypical cuprate Bi2Sr2CaCu2O8+x (Bi-2212). We emphasize the importance of accounting for energy-lowering structural distortions, which then allows us to (a) accurately describe the insulating antiferromagnetic (AFM) ground state of the undoped parent compound (in contrast to the metallic state predicted by previous studies); (b) identify numerous low-energy competing spin and charge stripe orders in the hole-overdoped material nearly degenerate in energy with the AFM ordered state, indicating strong spin fluctuations; (c) predict the lowest-energy hole-doped crystal structure including its long-range structural distortions and oxygen dopant positions that match high-resolution scanning transmission electron microscopy measurements; and (d) describe electronic bands near the Fermi energy with flat antinodal dispersions and Fermi surfaces that are in agreement with angle-resolved photoemission spectroscopy (ARPES) measurements and provide a clear explanation for the structural origins of the so-called “shadow bands.” We also show how one must go beyond band theory and include fully dynamic spin fluctuations via a many-body approach when aiming to make quantitative predictions to measure the ARPES spectra in the overdoped material. Finally, regarding spatial inhomogeneity, we show that the local structure at the CuO2 layer, rather than dopant electrostatic effects, modulates the local charge-transfer gaps, local correlation strengths, and by extension the local superconducting gaps. Published by the American Physical Society 2024

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Charge Order versus Superconductivity in Inhomogeneous Systems

Cited by 3 publications

References 13 publications

Competition of Superconductivity and Charge Density Waves in Cuprates: Recent Evidence and Interpretation

Competition of Superconductivity and Charge Density Waves in Cuprates: Recent Evidence and Interpretation

Evolution of the charge density wave order on the two-dimensional hexagonal lattice

First-Principles Prediction of Structural Distortions in the Cuprates and Their Impact on the Electronic Structure

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