Quasiparticle and Josephson tunneling of overdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CaCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2<

Özyüzer, L.; Zasadzinski, J. F.; Kendziora, Christopher A.

doi:10.1103/physrevb.61.3629

Cited by 58 publications

(72 citation statements)

References 44 publications

(52 reference statements)

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“…Moreover, the inner gap features also appear in SIS break junction spectra of a heavily overdoped crystal with T c = 62 K, corresponding to ∆ D = 7.5-9.0 meV (Ref. [22,29]). The magnitude of ∆ D is in excellent agreement with that found from the ARPES experiment (see Fig.…”

Section: The Pairing Symmetry In Hole-doped Cupratesmentioning

confidence: 99%

Identification of the bulk pairing symmetry in high-temperature superconductors: Evidence for an extendedswave with eight line nodes

Zhao

2001

Phys. Rev. B

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we identify the intrinsic bulk pairing symmetry for both electron and hole-doped cuprates from the existing bulk-and nearly bulk-sensitive experimental results such as magnetic penetration depth, Raman scattering, single-particle tunneling, Andreev reflection, nonlinear Meissner effect, neutron scattering, thermal conductivity, specific heat, and angle-resolved photoemission spectroscopy. These experiments consistently show that the dominant bulk pairing symmetry in hole-doped cuprates is of extended s-wave with eight line nodes, and of anisotropic s-wave in electron-doped cuprates. The proposed pairing symmetries do not contradict some surface-and phase-sensitive experiments which show a predominant d-wave pairing symmetry at the degraded surfaces. We also quantitatively explain the phase-sensitive experiments along the c-axis for both Bi2Sr2CaCu2O8+y and YBa2Cu3O7−y.

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Section: The Pairing Symmetry In Hole-doped Cupratesmentioning

confidence: 99%

Identification of the bulk pairing symmetry in high-temperature superconductors: Evidence for an extendedswave with eight line nodes

Zhao

2001

Phys. Rev. B

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“…42 ), ∆ D = 7.5-9.0 meV and ∆ M = 15-18 meV in heavily overdoped BSCCOs with T c = 62 K (Ref. 43,44 ). The Andreev reflection spectrum also indicates that ∆ D = 13 meV in an overdoped BSCCO with T c = 85 K (Ref.…”

Section: Strong Electron-phonon Coupling Features Along the Diagomentioning

confidence: 99%

Pairing interactions and pairing mechanism in high-temperature copper oxide superconductors

Zhao

2005

Phys. Rev. B

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The polaron binding energy Ep in undoped parent cuprates has been determined to be about 1.0 eV from the unconventional oxygen-isotope effect on the antiferromagnetic ordering temperature. The deduced value of Ep is in quantitative agreement with that estimated from independent optical data and that estimated theoretically from the measured dielectric constants. The substantial oxygenisotope effect on the in-plane supercarrier mass observed in optimally doped cuprates suggests that polarons are bound into the Cooper pairs. We also identify the phonon modes that are strongly coupled to conduction electrons from the angle-resolved photoemission spectroscopy, tunneling spectra, and optical data. We consistently show that there is a very strong electron-phonon coupling feature at a phonon energy of about 20 meV along the antinodal direction and that this coupling becomes weaker towards the diagonal direction. We further show that high-temperature superconductivity in cuprates is caused by strong electron-phonon coupling, polaronic effect, and significant coupling with 2 eV Cu-O charge transfer fluctuation.

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“…This has provided unique opportunities in terms of understanding physics of high temperature superconductors (HTSs) and creating new devices from these materials. IJJ tunneling spectroscopy can be used as a complimentary tool to evaluate the results of point contact tunneling [2], break junction [3] and STM/S [4] measurements. On the other hand, IJJ tunneling suffers from overinjection of quasiparticles, and this results in heating and nonequilibrium effects [5][6][7][8].…”

mentioning

confidence: 99%

Spin polarized and degenerate tunneling spectra in intrinsic Josephson junctions of Bi2212

Özdemir

Özyüzer

Kurter

2007

Phys. Status Solidi (c)

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PACS 74.50.+r, 74.81.Fa Tunneling characteristics of HgBr2 intercalated superconducting Bi2212 single crystals have been obtained by using 10x10 µm 2 intrinsic Josephson junction stacks, so called mesa structures. The spin degenerate current is driven along the c-axis with Au layer using point contact tunneling assembly at 4.2 K. The spin polarized current is also driven along the c-axis of crystals with Au/Co/Au multilayer. In order to understand the role of ferromagnetic layer (Co), quasiparticle branches are examined with and without magnetic field. The magnetic field evolution of switching currents are obtained for gaining further insight about the spin injection through the stack. In this study, the tunneling spectra of a regular mesa-IJJ stack (58 nm) with a Au layer and a ferromagnetic mesa-IJJ stack (73 nm) with Au/Co/Au multilayer on HgBr 2 intercalated Bi2212 single crystals are reported with and without magnetic field application. Insets of Figs. 1 (a) and (b) show schematic side view of the fabricated structures. In the latter configuration, ferromagnetic metal, Co is used as a source of spin polarized carriers injected into Bi2212 crystal. The aim of this study is to investigate the effect of the spin transfer from ferromagnetic metal through the Bi2212 stack and to obtain the influence of such kind of effect on the c-axis tunneling characteristics. For this reason, two sets of samples were prepared; in one set, freshly cleaved Bi2212 crystals have been deposited with Au while the other set has ferromagnetic multilayer (Au = 15 nm/Co = 80 nm /Au= 156 nm) on the crystal. Using photolithography and Ar ion beam etching techniques described elsewhere [12], 10x10 µm 2 mesa structures were fabricated on HgBr 2 intercalated crystals with T

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Quasiparticle and Josephson tunneling of overdopedBi2Sr2CaCu2<

Cited by 58 publications

References 44 publications

Identification of the bulk pairing symmetry in high-temperature superconductors: Evidence for an extendedswave with eight line nodes

Identification of the bulk pairing symmetry in high-temperature superconductors: Evidence for an extendedswave with eight line nodes

Pairing interactions and pairing mechanism in high-temperature copper oxide superconductors

Spin polarized and degenerate tunneling spectra in intrinsic Josephson junctions of Bi2212

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