Eliashberg analysis of Bi2Sr2CaCu2<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si28.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> intrinsic tunneling spectra

Sui, Xiaohong; Tang, Hui; Zhao, S. P.; Su, Zhixun

doi:10.1016/j.physc.2015.02.005

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…Furthermore one of us has argued [13] that in STM studies the tunneling probability may have significant k dependence. A longer term goal of the present work is to understand the structure we observe above the gap edge and see whether it can be analyzed using Eliashberg theory [14,15] to give direct information about a pairing boson. It will also be important to compare any such results with Eliashberg analysis of the optical reflectivity [15] which can be performed over a much wider energy range.…”

Section: Introductionmentioning

confidence: 99%

Temperature and field dependence of the intrinsic tunnelling structure in overdoped Bi2Sr2CaCu2O8+δ

Benseman

Cooper

2018

Phys. Rev. B

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We report intrinsic tunneling data for mesa structures fabricated on three over-and optimally-doped Bi 2.15 Sr 1.85 CaCu 2 O 8+δ crystals with transition temperatures of 86-78 K and 0.16-0.19 holes per CuO 2 unit, for a wide range of temperature (T) and applied magnetic field (H), primarily focusing on one overdoped crystal (OD80). The differential conductance above the gap edge shows a clear dip structure which is highly suggestive of strong coupling to a narrow boson mode. Data below the gap edge suggest that tunnelling is weaker near the nodes of the d-wave gap and give clear evidence for strong T-dependent pair breaking. These findings could help theorists make a detailed Eliashberg analysis and thereby contribute towards understanding the pairing mechanism. We show that for our OD80 crystal the gap above T c , although large, is reasonably consistent with the theory of superconducting fluctuations.

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Section: Introductionmentioning

confidence: 99%

Temperature and field dependence of the intrinsic tunnelling structure in overdoped Bi2Sr2CaCu2O8+δ

Benseman

Cooper

2018

Phys. Rev. B

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“…The above mentioned behavior of the spin excitation spectrum has been directly observed in inelastic neutron scattering (INS) experiments [11,12,[27][28][29][30][31] yielding strong evidence for spin-fluctuation mediated pairing. Since signatures of this resonance mode are also expected to be visible in optical, photoemission and tunneling spectra, a considerable number of studies tried to complete the picture using these techniques [2][3][4][5][6][7][8][9][32][33][34][35][36], all probing a slightly different boson spectrum and facing complicated inversion techniques. Recently, machine learning algorithms entered the scene and their application to angle-resolved photoemission (ARPES) data proved to be a powerful concept to reversemodel the spin-spectrum, but this happens at the cost of a number of free parameters which cannot be easily mapped onto physical quantities [10,34].…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we extracted the bosonic spectrum from the inelastic part of scanning tunneling spectra which we obtained on the cuprate superconductors Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212) and YBa 2 Cu 3 O 6+x (Y123). In contrast to previous scanning tunneling spectroscopy (STS) [3,35] and break junction experiments [37] that focused on Bi2212, we obtain the boson spectrum without a functional prescription and over a wide energy range for both materials. It naturally exhibits the sharp resonance mode and overdamped continuum that are characteristic for the spin spectrum measured in INS.…”

Section: Introductionmentioning

confidence: 99%

Bosonic excitation spectra of superconducting Bi2Sr2CaCu2O8+δ and YBa2Cu3O6+x extracted from scanning tunneling spectra

Gozlinski,

Henn,

Wolf

et al. 2024

J. Phys.: Condens. Matter

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A detailed interpretation of scanning tunneling spectra obtained on unconventional superconductors enables one to gain information on the pairing boson. Decisive for this approach are inelastic tunneling events. Due to the lack of momentum conservation in tunneling from or to the sharp tip, those are enhanced in the geometry of a scanning tunneling microscope compared to planar tunnel junctions. This work extends the method of obtaining the bosonic excitation spectrum by deconvolution from tunneling spectra to nodal d-wave superconductors. In particular, scanning tunneling spectra of slightly underdoped Bi2Sr2CaCu2O8+δ with a Tc of 82 K and optimally doped YBa2Cu3O6+x with a Tc of 92 K reveal a resonance mode in their bosonic excitation spectrum at Ωres~63meV and Ωres~61meV respectively. In both cases, the overall shape of the bosonic excitation spectrum is indicative of predominant spin scattering with a resonant mode at Ωres < 2∆ and overdamped spin ﬂuctuations for energies larger than 2∆. To perform the deconvolution of the experimental data, we implemented an eﬃcient iterative algorithm that signiﬁcantly enhances the reliability of our analysis.

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Quasi-particle density of states and bosonic modes in Bi2Sr2CaCu2O8+δ

Wang

Tang

2018

Physica C: Superconductivity and its Applications

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Eliashberg analysis of Bi2Sr2CaCu2O8+δ intrinsic tunneling spectra

Cited by 4 publications

References 27 publications

Temperature and field dependence of the intrinsic tunnelling structure in overdoped Bi2Sr2CaCu2O8+δ

Temperature and field dependence of the intrinsic tunnelling structure in overdoped Bi2Sr2CaCu2O8+δ

Bosonic excitation spectra of superconducting Bi2Sr2CaCu2O8+δ and YBa2Cu3O6+x extracted from scanning tunneling spectra

Quasi-particle density of states and bosonic modes in Bi2Sr2CaCu2O8+δ

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