Superconducting Gap Anisotropy vs Doping Level in High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Cuprates

Kendziora, Christopher A.; Kelley, R. J.; Onellion, M.

doi:10.1103/physrevlett.77.727

Cited by 111 publications

(57 citation statements)

References 24 publications

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“…1b) is not small (9±2 meV), which is obviously not consistent with the d-wave pairing symmetry. A similar evolution of the gap function with the doping has been observed by the bulk-sensitive polarized Raman scattering [7], which also shows that the difference in the magnitudes of the gaps along the Cu-O bonding direction and the diagonals becomes smaller and smaller towards overdoping. …”

Section: The Pairing Symmetry In Hole-doped Cupratessupporting

confidence: 55%

“…In recent years, many experiments have been designed to test the order parameter (OP) symmetry in the cuprate superconductors. However, contradictory conclusions have been drawn from different experimental techniques [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], which can be classified into being bulk-sensitive and surface-sensitive. For example, the magnetic penetration depth measurements and polarized Raman scattering experiments are bulk-sensitive.…”

Section: Introductionmentioning

confidence: 99%

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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 Cupratessupporting

confidence: 55%

Section: Introductionmentioning

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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“…Although this interpretation was suggested by Kendziora et al [8], it is unlikely because the low frequency profile of the B 1g spectrum shows ω 3 dependence, as is seen in the inset of Fig.1. This power law is in agreement with the theoretical prediction for d wave superconductor [13], and in strong contrast to a sharp threshold excitation for s wave gap.…”

Section: Resultsmentioning

confidence: 77%

“…Since reports on Raman spectrum of Tl 2 Ba 2 CuO 6+δ (Tl 2201) are very limited [8,9], it must be helpful to study a precise doping dependence of Raman response in this material. In the present study, we prepared single crystals of tetragonal Tl 2201 and measured the Raman scattering spectra for three overdoped Tl 2201 crystals, focusing on the change of superconductivity response with respect to doping levels.…”

Section: Introductionmentioning

confidence: 99%

Superconducting gap of overdoped Tl2Ba2CuO6+δ observed by Raman scattering

Nishikawa¹,

Masui²,

Tajima³

et al. 2008

Journal of Physics and Chemistry of Solids

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We report Raman scattering spectra for single crystals of overdoped Tl 2 Ba 2 CuO 6+δ (Tl 2201) at low temperatures. It was observed that the pair breaking peaks in A 1g and B 1g spectra radically shift to lower energy with carrier doping. We interpret it as s wave component mixing into d wave, although the crystal structure is tetragonal. Since similar phenomena were observed also in YBa 2 Cu 3 O y and Bi 2 Sr 2 CaCu 2 O z , we conclude that s wave mixing is a common property for overdoped high T c superconductors.

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“…The symmetry of the superconducting order parameter for the optimally doped HTS's is consistent with d x 2 Ϫy 2( d-wave͒ as found in angle-resolved photoemission spectroscopy 3,4 ͑ARPES͒ experiments on Bi 2 Sr 2 CaCu 2 O 8ϩ␦ ͑Bi-2212͒ and tricrystal ring 5,6 experiments on YBa 2 Cu 3 O 7Ϫx and Tl 2 Ba 2 CuO 6ϩ␦ . The possibility of gap symmetry conversion from d-wave to s-wave with overdoping of Bi-2212 is suggested by Kendziora et al 7 and Kelley et al 8 using Raman and ARPES studies respectively. Tunneling measurements of the strong-coupling ratio 2⌬/k B T c in Bi-2212 indicate a decrease from a value of 9.3 for optimally doped samples to values approaching the BCS mean-field value with overdoping.…”

Section: Introductionmentioning

confidence: 99%

Quasiparticle and Josephson tunneling of overdopedBi2Sr2CaCu2<

2000

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The point contact tunneling technique is used to examine quasiparticle and Josephson currents in overdoped Bi 2 Sr 2 CaCu 2 O 8ϩ␦ ͑Bi-2212͒ single crystals with bulk T c values ranging from 82 K down to 62 K. Superconductor-insulator-normal-metal ͑SIN͒ tunnel junctions are formed between Bi-2212 crystals and a Au tip, which display well-resolved quasiparticle gap features including sharp conductance peaks. Reproducible superconductor-insulator-superconductor ͑SIS͒ tunnel junctions are also obtained between two pieces of the Bi-2212 crystals, resulting in simultaneous quasiparticle and Josephson currents. The dynamic conductances of both SIN and SIS junctions are qualitatively similar to those found on optimally doped Bi-2212, but with reduced gap values, e.g., ⌬ϭ15-20 meV for T c ϭ62 K. Fits to the conductance data in the gap region are obtained using a model with d x 2 Ϫy 2 symmetry, and it is shown that this provides a better fit than s-wave symmetry. Both SIN and SIS tunneling conductances also display dip and hump features at high bias voltages similar to those found on optimal and underdoped crystals, indicating that these are intrinsic properties of the quasiparticles. The SIS data indicate that these features appear to be part of a larger spectrum that extends out to 300-400 mV. The Josephson current has been measured for 13 SIS junctions on the 62 K crystals with resistances varying over two decades. It is found that the maximum value depends on junction resistance in a manner consistent with Ambegaokar-Baratoff theory, but with a reduced I c R n product.

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Superconducting Gap Anisotropy vs Doping Level in High-TcCuprates

Cited by 111 publications

References 24 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

Superconducting gap of overdoped Tl2Ba2CuO6+δ observed by Raman scattering

Quasiparticle and Josephson tunneling of overdopedBi2Sr2CaCu2<

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