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Lee, W.S.; Meevasana, W.; Johnston, S.; Lu, D. H.; Vishik, Inna; Moore, Robert; Eisaki, H.; Kaneko, Nobu‐Hisa; Devereaux, T. P.; Shen, Zhi‐Xun

doi:10.1103/physrevb.77.140504

Cited by 34 publications

(33 citation statements)

References 22 publications

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“…[8][9][10][11] This view has been challenged by a time-and angle-resolved photoemission experiment (trARPES) showing that nodal quasiparticles also respond to the superconducting transition and their spectral weight scales with the superfluid density 12 and by the report of a nodeless energy gap in a very weakly doped sample. 13 Here, we use trARPES to investigate changes in the nodal electron dynamics across a range of dopings and temperatures in the phase diagram of Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212).…”

Section: Introductionmentioning

confidence: 99%

Signatures of superconductivity and pseudogap formation in nonequilibrium nodal quasiparticles revealed by ultrafast angle-resolved photoemission

et al. 2013

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We use time-and angle-resolved photoemission to measure the nodal non-equilibrium electronic states in various dopings of Bi2Sr2CaCu2O 8+δ . We find that the initial pump-induced transient signal of these ungapped states is strongly affected by the onset of the superconducting gap at Tc, superconducting pairing fluctuations at Tp, and the pseudogap at T * . Moreover, Tp marks a suggestive threshold in the fluence-dependent transient signal, with the appearance of a critical fluence below Tp that corresponds to the energy required to break apart all Cooper pairs. These results challenge the notion of a nodal-antinodal dichotomy in cuprate superconductors by establishing a new link between nodal quasiparticles and the cuprate phase diagram.

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Section: Introductionmentioning

confidence: 99%

Signatures of superconductivity and pseudogap formation in nonequilibrium nodal quasiparticles revealed by ultrafast angle-resolved photoemission

et al. 2013

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“…While longstudied from Raman, infrared, and neutron measurements, recent ARPES and scanning tunneling microscopy ͑STM͒ measurements on several cuprates has reinvigorated the exploration of the role of phonons on HTSC. 42 Experiments on Bi-2212, [43][44][45][46] 51 coupling to the neutron resonance and/or spin continuum, 52 and Engelsberg-Schrieffer renormalizations 53 due to coupling of electrons to a collection of optical phonons. These phonons include the out-of-phase c-axis oxygen buckling modes and the in-plane Cu-O bond-stretching modes.…”

Section: Introductionmentioning

confidence: 99%

Systematic study of electron-phonon coupling to oxygen modes across the cuprates

et al. 2010

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The large variations in T c across the cuprate families is one of the major unsolved puzzles in condensed matter physics and is poorly understood. Although there appears to be a great deal of universality in the cuprates, several orders of magnitude changes in T c can be achieved through changes in the chemical composition and structure of the unit cell. In this paper we formulate a systematic examination of the variations in electron-phonon coupling to oxygen phonons in the cuprates, incorporating a number of effects arising from several aspects of chemical composition and doping across cuprate families. It is argued that the electronphonon coupling is a very sensitive probe of the material-dependent variations in chemical structure, affecting the orbital character of the band crossing the Fermi level, the strength of local electric fields arising from structural-induced symmetry breaking, doping-dependent changes in the underlying band structure, and ionicity of the crystal governing the ability of the material to screen c-axis perturbations. Using electrostatic Ewald calculations and known experimental structural data, we establish a connection between the material's maximal T c at optimal doping and the strength of coupling to c-axis modes. We demonstrate that materials with the largest coupling to the out-of-phase bond-buckling ͑B 1g ͒ oxygen phonon branch also have the largest T c 's. In light of this observation we present model T c calculations using a two-well model where phonons work in conjunction with a dominant pairing interaction, presumably due to spin fluctuations, indicating how phonons can generate sizeable enhancements to T c despite the relatively small coupling strengths. Combined, these results can provide a natural framework for understanding the doping and material dependence of T c across the cuprates.

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“…The interpretation of the temperature dependence of boson structures in the real part of the self energy requires some care. In a recent paper (Lee et al 2008), the temperature variation of the nodal kink in optimally doped Bi 2 Sr 2 Y 0.08 Cu 2 O 8+δ was traced and a superconducting induced shift in the boson energy involved identified. The data was interpreted in terms of a two Einstein mode model at 36 and 70 meV respectively and a superconducting gap value of 37 meV at T = 0.…”

Section: Angle Resolved Photoemission Spectroscopymentioning

confidence: 99%

Bosons in high-temperature superconductors: an experimental survey

Ćarbotte¹,

Timusk²,

Hwang³

2011

Rep. Prog. Phys.

117

164

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Abstract. We review a number of experimental techniques that are beginning to reveal fine details of the bosonic spectrum α 2 F (Ω) that dominates the interaction between the quasiparticles in high temperature superconductors. Angle-resolved photo emission (ARPES) shows kinks in electronic dispersion curves at characteristic energies that agree with similar structures in the optical conductivity and tunnelling spectra. Each technique has its advantages. ARPES is momentum resolved and offers independent measurements of the real and imaginary part of the contribution of the bosons to the self energy of the quasiparticles. The optical conductivity can be used on a larger variety of materials and with the use of maximum entropy techniques reveals rich details of the spectra including their evolution with temperature and doping. Scanning tunnelling spectroscopy offers spacial resolution on the unit cell level. We find that together the various spectroscopies, including recent Raman results, are pointing to a unified picture of a broad spectrum of bosonic excitations at high temperature which evolves, as the temperature is lowered into a peak in the 30 to 60 meV region and a featureless high frequency background in most of the materials studied. This behaviour is consistent with the spectrum of spin fluctuations as measured by magnetic neutron scattering. However, there is evidence for a phonon contribution to the bosonic spectrum as well.arXiv:1105.0726v1 [cond-mat.supr-con]

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Superconductivity-induced self-energy evolution of the nodal electron of optimally dopedBi2Sr2Ca0.92Y0.08

Cited by 34 publications

References 22 publications

Signatures of superconductivity and pseudogap formation in nonequilibrium nodal quasiparticles revealed by ultrafast angle-resolved photoemission

Signatures of superconductivity and pseudogap formation in nonequilibrium nodal quasiparticles revealed by ultrafast angle-resolved photoemission

Systematic study of electron-phonon coupling to oxygen modes across the cuprates

Bosons in high-temperature superconductors: an experimental survey

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