Zero Bias Conductance Peak Enhancement in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>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>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>CaCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><

Sinha, Saion; Ng, K.‐W.

doi:10.1103/physrevlett.80.1296

Cited by 76 publications

(46 citation statements)

References 14 publications

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“…These facts obviously show that the ZBCP comes from not the magnetic impurity effect, but the superconductivity of the d-wave pairing symmetry. Thus, the experimental results in Figures 2 and 3 [52,53]. Their experimental results of the ZBCP behaviors are similar to ours nevertheless the tunneling direction in the ab-plane at the junction interface was not controlled in their experiments.…”

Section: Tunneling Conductance Measurementssupporting

confidence: 74%

Smearing origin of zero-bias conductance peak in Ag-SiO-Bi2Sr2CaCu2O8+δ planar tunnel junctions: influence of diffusive normal metal verified with the circuit theory

Shigeta¹,

Tanaka

Ichikawa

et al. 2006

Eur. Phys. J. B

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Abstract. We propose a new approach of smearing origins of a zero-bias conductance peak (ZBCP) in high-Tc superconductor tunnel junctions through the analysis based on the circuit theory for a d-wave pairing symmetry. The circuit theory has been recently developed from conventional superconductors to unconventional superconductors. The ZBCP frequently appears in line shapes for this theory, in which the total resistance was constructed by taking account of the effects between a d-wave superconductor and a diffusive normal metal (DN) at a junction interface, including the midgap Andreev resonant states (MARS), the coherent Andreev reflection (CAR) and the proximity effect. Therefore, we have analyzed experimental spectra with the ZBCP of Ag-SiO-Bi2Sr2CaCu2O 8+δ (Bi-2212) planar tunnel junctions for the {110}-oriented direction by using a simplified formula of the circuit theory for d-wave superconductors. The fitting results reveal that the spectral features of the ZBCP are well explained by the circuit theory not only excluding the Dynes's broadening factor but also considering only the MARS and the DN resistance. Thus, the ZBCP behaviors are understood to be consistent with those of recent studies on the circuit theory extended to the systems containing d-wave superconductor tunnel junctions.

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Section: Tunneling Conductance Measurementssupporting

confidence: 74%

Smearing origin of zero-bias conductance peak in Ag-SiO-Bi2Sr2CaCu2O8+δ planar tunnel junctions: influence of diffusive normal metal verified with the circuit theory

Shigeta¹,

Tanaka

Ichikawa

et al. 2006

Eur. Phys. J. B

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“…The Andreev reflection spectrum also indicates that ∆ D = 13 meV in an overdoped BSCCO with T c = 85 K (Ref. 45 ), while the other Andreev reflection spectrum shows a gap feature at ∆ M = 25 meV (Ref. 46 ).…”

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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“…In the Andreev reflection process a charge 2e is transferred into the superconductor (forming a Cooper pair) and a current flows through the junction. This current flow through MGS is the explanation of the ZBCP seen in many experiments [16,17,18,19].…”

Section: Midgap State Resonancementioning

confidence: 99%

“…When there is a sign difference between the order parameters before and after scattering, a zero-energy bound state is formed (MGS). In normal metal-d-wave superconductor (N|d) junctions the MGS gives rise to a zero-bias conductance peak (ZBCP), established both theoretically [13,14,15] and experimentally [16,17,18,19]. Previously, it has been shown that MGS gives rise to a current peak at finite voltage in both s-wave superconductor-d-wave superconductor (s|d) and d-wave superconductor-d-wave superconductor (d|d) junctions, resulting in negative 0749-6036/96/000000 + 00 $18.00/0 c 1996 Academic Press Limited differential conductance [8,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Resonant transport through midgap states in voltage-biased Josephson junctions of d-wave superconductors

Löfwander

Johansson

Shumeiko

et al. 1999

Superlattices and Microstructures

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We study theoretically the ac Josephson effect in voltage biased planar junctions of d-wave superconductors. For some orientations of the superconductors a current peak is found at finite voltage in the current-voltage characteristics. We pick out the relevant physical processes and write down an analytical formula for the current which clearly shows how the midgap state acts as a resonance and produces the peak. We present a possible explanation for the zero-bias conductance peak, recently found in experiments on grain boundary junctions of high-temperature superconductors, in terms of resonant transmission through midgap state of quasiparticles undergoing multiple Andreev reflections. We note that within our framework the zero-bias conductance peak appears in rather transparent Josephson junctions of d-wave superconductors.

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Zero Bias Conductance Peak Enhancement inBi2Sr2CaCu2<

Cited by 76 publications

References 14 publications

Smearing origin of zero-bias conductance peak in Ag-SiO-Bi2Sr2CaCu2O8+δ planar tunnel junctions: influence of diffusive normal metal verified with the circuit theory

Smearing origin of zero-bias conductance peak in Ag-SiO-Bi2Sr2CaCu2O8+δ planar tunnel junctions: influence of diffusive normal metal verified with the circuit theory

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

Resonant transport through midgap states in voltage-biased Josephson junctions of d-wave superconductors

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