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Tsuei, C. C.; Kirtley, J. R.; Ren, Zhifeng; Wang, J. H.; Raffy, H.; Li, Z. Z.

doi:10.1038/387481a0

Cited by 133 publications

(69 citation statements)

References 23 publications

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“…1,2 One question that arises is whether the pairing symmetry is affected by doping. 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.…”

Section: Introductionsupporting

confidence: 51%

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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Section: Introductionsupporting

confidence: 51%

Quasiparticle and Josephson tunneling of overdopedBi2Sr2CaCu2<

2000

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“…As most of the research effort has focused on the optimal/underdoped regime, in an attempt to understand the connection between MottHubbard insulating behavior and superconductivity, the study of heavily overdoped Tl2201 represents an important alternative approach. At this stage, it has already been established that near optimal doping Tl2201 exhibits a few key features common to most cuprates, such as a d x 2 −y 2 superconducting (SC) gap [4] and the (π,π) magnetic resonant mode [5]. Additionally, in the very overdoped regime a coherent three-dimensional Fermi surface (FS) was observed in angular magnetoresistance oscillations measurements (AMRO) [6].…”

mentioning

confidence: 99%

Fermi Surface and Quasiparticle Excitations of OverdopedTl2Ba2CuO6+δ

et al. 2005

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The electronic structure of the high-Tc superconductor Tl2Ba2CuO 6+δ is studied by ARPES. For a very overdoped Tc = 30 K sample, the Fermi surface consists of a single large hole pocket centered at (π,π) and is approaching a topological transition. Although a superconducting gap with d x 2 −y 2 symmetry is tentatively identified, the quasiparticle evolution with momentum and binding energy exhibits a marked departure from the behavior observed in under and optimally doped cuprates. The relevance of these findings to scattering, many-body, and quantum-critical phenomena is discussed.

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“…Experiments on Tl 2 Ba 2 CuO 6+δ , a material with unbuckled, widely spaced CuO 2 layers and a maximum T c around 90 K, have therefore played a pivotal role in resolving some issues central to our understanding of these materials (1,2). We report inelastic neutron scattering measurements of Tl 2 Ba 2 CuO 6+δ near optimum doping (T c ∼ 90 K) that provide evidence of a sharp magnetic resonant mode below T c .…”

mentioning

confidence: 99%

Magnetic Resonant Mode in the Single-Layer High-Temperature Superconductor Tl ₂ Ba ₂ CuO _6+δ

Bourges

Sidis

et al. 2002

Science

226

149

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An unusual spin excitation mode observed by neutron scattering has inspired numerous theoretical studies of the interplay between charged quasiparticles and collective spin excitations in the copper oxide high-temperature superconductors. The mode has, thus far, only been observed in materials with crystal structures consisting of copper oxide bilayers, and it is absent in the single-layer compound La 2− x Sr x CuO 4+δ . Neutron-scattering data now show that the mode is present in Tl 2 Ba 2 CuO 6+δ , a single-layer compound with a superconducting transition temperature of ∼90 kelvin, demonstrating that it is a generic feature of the copper oxide superconductors, independent of the layer sequence. This restricts the theoretical models for the origin of the resonant mode and its role in the mechanism of high-temperature superconductivity.

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Pure d x 2 - y 2

Cited by 133 publications

References 23 publications

Quasiparticle and Josephson tunneling of overdopedBi2Sr2CaCu2<

Quasiparticle and Josephson tunneling of overdopedBi2Sr2CaCu2<

Fermi Surface and Quasiparticle Excitations of OverdopedTl2Ba2CuO6+δ

Magnetic Resonant Mode in the Single-Layer High-Temperature Superconductor Tl ₂ Ba ₂ CuO _6+δ

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Pure d x 2 - y 2

Cited by 133 publications

References 23 publications

Quasiparticle and Josephson tunneling of overdopedBi2Sr2CaCu2<

Quasiparticle and Josephson tunneling of overdopedBi2Sr2CaCu2<

Fermi Surface and Quasiparticle Excitations of OverdopedTl2Ba2CuO6+δ

Magnetic Resonant Mode in the Single-Layer High-Temperature Superconductor Tl 2 Ba 2 CuO 6+δ

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Product

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Magnetic Resonant Mode in the Single-Layer High-Temperature Superconductor Tl ₂ Ba ₂ CuO _6+δ