Topological doping of a three-dimensional Peierls system: Predicted structure of doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">BaBiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Bischofs, Ilka B.; Allen, Philip B.; Kostur, Vladimir N.; Bhargava, Rahul

doi:10.1103/physrevb.66.174108

Cited by 9 publications

(4 citation statements)

References 24 publications

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“…At half filling, we find a bond disproportionated state that can be viewed as a lattice of localized bipolarons. Upon hole-doping, this state gives way to a polaron-liquid-like state with short-range correlations, consistent with proposals for nano-scale phase separation or strongly fluctuating lattice polarons in doped BKBO [52][53][54][55][56][57]. We also find s-wave superconducting tendencies, which primarily form on the oxygen sublattice.…”

Section: X2supporting

confidence: 87%

Quantum Monte Carlo study of lattice polarons in the two-dimensional three-orbital Su–Schrieffer–Heeger model

Johnston

2020

npj Quantum Mater.

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The electron-lattice interaction gives rise to a rich set of phenomena in quantum materials. Microscopically, this interaction often arises from the modulation of orbital overlaps; however, many theoretical studies neglect such couplings. Here, we present an exact diagonalization and determinant quantum Monte Carlo study of a three-orbital Su-Schrieffer-Heeger (SSH) model, on a twodimensional Lieb lattice and in the negative charge transfer regime. At half-filling (one hole/unit cell), we observe a bipolaron insulating phase with a bond-disproportionate lattice. This phase is robust against moderate hole doping but is suppressed at large hole concentrations, leading to a metallic polaron-liquid-like state with fluctuating patches of local distortions. We also find an s-wave superconducting state at large hole doping that primarily appears on the oxygen sublattice. Our work provides a nonperturbative view of SSH-type couplings in two dimensions with implications for materials where such couplings are dominant.

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Section: X2supporting

confidence: 87%

Quantum Monte Carlo study of lattice polarons in the two-dimensional three-orbital Su–Schrieffer–Heeger model

Johnston

2020

npj Quantum Mater.

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“…The concept of bipolarons (local charge carrier pairs) has been later applied to BPB [200][201][202][203], Ba 1−x K x BiO 3−δ (BKB, T c ≤ 30 K [204,205]) [203,206,207] and cuprates [195,199,[208][209][210][211]. It was explicitly shown for BPB and BKB by Xray absorption spectroscopy [203] that bipolaronic states and CDWs coexist and compete, which might lead, in particular, to the observed nonmonotonic dependence T c (x) [212].…”

Section: Considerations On Peculiarities and Mechanisms Of Supercondumentioning

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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“…Based on transmission electron microscopy experiments, it appears that nanoscale regions of ordered distortions in BPBO tend to percolate into stripe-like formations 24 . This calls to mind predictions of 2D stacking "slices" of concentrated holes in BKBO 25 and strongly suggests that phase mixing is intrinsic to these materials in certain doping ranges. Overall, however, the ubiquity of structural phase mixing in superconducting bismuth oxides and its relationship to electronic structure and transport properties has remained unclear.…”

mentioning

confidence: 99%

Cooling a polaronic liquid: Phase mixture and pseudogap-like spectra in superconducting $Ba_{1-x}K_{x}BiO_{3}$

Naamneh¹,

Yao²,

Jandke³

et al. 2018

Preprint

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Many complex electronic systems exhibit so-called pseudogaps, which are poorly-understood suppression of low-energy spectral intensity in the absence of an obvious gap-inducing symmetry. Here we investigate the superconductor Ba 1−x K x BiO 3 near optimal doping, where unconventional transport behavior and evidence of pseudogap(s) have been observed above the superconducting transition temperature T c , and near an insulating phase with longrange lattice distortions. Angle-resolved photoemission spectroscopy (ARPES) reveals a dispersive band with vanishing quasiparticle weight and "tails" of deep-energy intensity that strongly decay approaching the Fermi level. Upon cooling below a transition temperature T p > T c , which correlates with a change in the slope of the resistivity vs. temperature, a partial transfer of spectral weight near E F into the deep-binding energy tails is found to result from metal-insulator phase separation. Combined with simulations and Raman scattering, our results signal that insulating islands of ordered bipolarons precipitate out of a disordered polaronic liquid and provide evidence that this process is regulated by a crossover in the electronic mean free path.Pseudogaps represent a departure from the expectations of standard band theory and the Fermi liquid theory of electronic excitations, which together serve as a successful starting point for understanding many condensed matter systems. They could potentially originate from any ways in which the conventional theories might break down, e.g., due to disorder, fluctuations, strong interactions, and/or strong correlations. But it is also conceivable that some observed pseudogaps might be less mysterious than they first seem, in the sense that they are rooted a "hidden" order

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Topological doping of a three-dimensional Peierls system: Predicted structure of dopedBaBiO3

Cited by 9 publications

References 24 publications

Quantum Monte Carlo study of lattice polarons in the two-dimensional three-orbital Su–Schrieffer–Heeger model

Quantum Monte Carlo study of lattice polarons in the two-dimensional three-orbital Su–Schrieffer–Heeger model

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

Cooling a polaronic liquid: Phase mixture and pseudogap-like spectra in superconducting $Ba_{1-x}K_{x}BiO_{3}$

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