Theoretical investigation of the quasiparticle dispersion of bilayer high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math>superconductors

Li, Jianxin; Zhou, Tao; Wang, Z. D.

doi:10.1103/physrevb.72.094515

Cited by 10 publications

(9 citation statements)

References 25 publications

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“…However, based on evidence already cited [24,23] we do not necessarily exclude a role for fractal phonons (f r ph ) originally proposed as an e-pair coupling mechanism [5]. Indeed the possible role of both phonons and spin fluctuations has already been considered in earlier work [53]. In addition we do not rule out alternative mechanisms in different types of materials, which may also be influenced by fractal networks in a similar manner to that proposed by Prester [18,19].…”

Section: The Pg Phasementioning

confidence: 77%

The origins of macroscopic quantum coherence in high temperature superconductivity

Turner

Nottale

2015

Physica C: Superconductivity and its Applications

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A new, theoretical approach to macroscopic quantum coherence and superconductivity in the p-type (hole doped) cuprates is proposed. The theory includes mechanisms to account for e-pair coupling in the superconducting and pseudogap phases and their inter relations observed in these materials.Electron pair coupling in the superconducting phase is facilitated by local quantum potentials created by static dopants in a mechanism which explains experimentally observed optimal doping levels and the associated peak in critical temperature. By contrast, evidence suggests that electrons contributing to the pseudogap are predominantly coupled by fractal spin waves (fractons) induced by the fractal arrangement of dopants.On another level, the theory offers new insights into the emergence of a macroscopic quantum potential generated by a fractal distribution of dopants. This, in turn, leads to the emergence of coherent, macroscopic spin waves and a second associated macroscopic quantum potential, possibly supported by charge order. These quantum potentials play two key roles. The first involves the transition of an expected diffusive process (normally associated with Anderson localization) in fractal networks, into e-pair coherence. The second involves the facilitation of tunnelling between localized e-pairs. These combined effects lead to the merger of the super conducting and pseudo gap phases into a single coherent condensate at optimal doping. The underlying theory relating to the diffusion to quantum transition is supported by Coherent Random Lasing, which can be explained using an analogous approach. As a final step, an experimental program is outlined to validate the theory and suggests a new approach to increase the stability of electron pair condensates at higher temperatures.

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Section: The Pg Phasementioning

confidence: 77%

The origins of macroscopic quantum coherence in high temperature superconductivity

Turner

Nottale

2015

Physica C: Superconductivity and its Applications

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“…One of the authors has calculated this quantity in cuprates by using RPA and found that the suppression factor is from 0.06 to 0.42, depending on doping. 49 For the pnictides, so far there is no similar calculation based on RPA due to the complexity of multiband structure and indeed it needs a careful study. We also believe that the renormalization effect is possibly model dependant, which needs careful consideration.…”

Section: Discussionmentioning

confidence: 99%

Spin dynamics in electron-doped iron pnictide superconductors

Zhou

Ting

2010

Phys. Rev. B

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The doping dependence of spin excitations in Ba͑Fe 1−x Co x ͒ 2 As 2 is studied based on a phenomenological two-orbital model under the random-phase approximation. We adopt this model because of its ability to fit the doping evolution of the Fermi surfaces and the asymmetry in the superconductivity ͑SC͒ coherent peaks as observed, respectively, by the angle-resolved photoemission spectroscopy ͑ARPES͒ and the scanning tunneling microscopy experiments in this type of compounds. The interplay between the spin-density wave and SC is considered in our calculation. Our results for the spin susceptibility are in qualitative agreement with neutronscattering ͑NS͒ experiments in various doping ranges at temperatures above and below the superconducting transition temperature T c . For the overdoped sample where one of the two hole pockets around ⌫ point disappears according to ARPES, we show that the imaginary part of the spin susceptibility in both SC and normal phases exhibits a gaplike behavior. This feature is consistent with the "pseudogap" as observed by recent nuclear magnetic resonance and NS experiments.

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“…From these calculations, the following conclusions can be drawn. The PDH structure can be explained by a coupling of the electronic excitations to magnetic resonances or spin fluctuations [ 20 , 21 ]. At low doping, the coupling between the layers should be antiferromagnetic [ 15 ], and there might be contributions to superconductivity by interlayer Cooper pairs, being formed by holes belonging to different layers.…”

Section: Introductionmentioning

confidence: 99%

Correlation-induced Suppression of Bilayer Splitting in High-T c Cuprates: A Variational Cluster Approach

Fulterer

Arrigoni

2012

J Supercond Nov Magn

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We carry out a theoretical study of the bilayer single-band Hubbard model in the undoped and in the superconducting phases by means of the variational cluster approach. In particular, we focus on the splitting between the “bonding” and “antibonding” bands induced by the interlayer hopping, as well as its interplay with strong correlation effects. We find that the splitting is considerably suppressed in both the normal and superconducting phases, in qualitative agreement with experiments on Bi2Sr2CaCu2O8+δ. In addition, in the superconducting phase, the shape of the splitting in k space is modified by correlations.

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Theoretical investigation of the quasiparticle dispersion of bilayer high-Tcsuperconductors

Cited by 10 publications

References 25 publications

The origins of macroscopic quantum coherence in high temperature superconductivity

The origins of macroscopic quantum coherence in high temperature superconductivity

Spin dynamics in electron-doped iron pnictide superconductors

Correlation-induced Suppression of Bilayer Splitting in High-T c Cuprates: A Variational Cluster Approach

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