Observations of electronic inhomogeneity in heavily Pb-doped<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>

Kinoda, Go; Hasegawa, Tetsuya; Nakao, Shin-ichi; Hanaguri, T.; Kitazawa, K.; Shimizu, Keisuke; Shimoyama, Jun–ichi; Kishio, K.

doi:10.1103/physrevb.67.224509

Cited by 54 publications

(37 citation statements)

References 23 publications

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“…A careful characterization of the annealed samples reveals that changes in T c are always accompanied by a severe degradation of the sample quality. Kinoda et al 15 have showed also that the annealing in oxygen can substantially increase the gap inhomogeneity. For this reason we have used only high quality as grown single crystals in which, the substitution of trivalent Bi for divalent Sr during growth reduces the hole concentration in the CuO 2 planes.…”

Section: Methodsmentioning

confidence: 99%

Quasiparticle density of states ofBi2Sr2CaCu2O8+δ
Vedeneev
¹
,
Maude
²

2005
Phys. Rev. B
22
0
8
0
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Break-junction tunneling spectroscopy at temperatures 30-50 mK in high magnetic field is used to directly probe the quasiparticle density of states within the energy gap in a single crystal Bi2212 high-Tc superconductor. The measured tunneling conductances dI/dV (V ) in the subgap region have a zero flat region with no evidence for a linear increase of the density of states with voltage. A number of tunnel break-junctions exhibited dI/dV (V ) curves with a second energy gap structure at the average magnitude 2∆p−p/e = 13 mV. Our data cannot be explained by either a pure s pairing or a pure d x 2 −y 2 pairing.

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Section: Methodsmentioning

confidence: 99%

Quasiparticle density of states ofBi2Sr2CaCu2O8+δ
Vedeneev
¹
,
Maude
²

2005
Phys. Rev. B
22
0
8
0
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“…Stacking faults in the form of lamellas of the modulated phase were observed on TEM and STM images of crystals with a slightly lower Pb content. 16,21,22 The presence of stacking faults in our crystals may also explain the relatively broad superconducting transition and the presence of a significant amount of disorder (see Sec. IV).…”

Section: A Structure Of Bi-2212mentioning

confidence: 96%

Structural origin of the low superconducting anisotropy of Bi1.7Pb0.4Sr2Ca0.9Cu2O8 crystals

2004

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The structure of Bi 1.7 Pb 0.4 Sr 2 Ca 0.9 Cu 2 O 8 ͑T c =93 K͒ was refined from x-ray single crystal diffraction data in space group A2aa, a = 5.3852͑9͒ Å, b = 5.4286͑9͒ Å, c = 30.997͑6͒ Å. For this composition, the crystal structure is free from the structural modulation connected with the presence of additional oxygen atoms in the BiO layers. The c-axis lattice parameter is slightly larger in (Bi,Pb)-2212 crystals than in Pb-free Bi-2212 crystals, but the complete structural refinement revealed an inhomogeneous redistribution of the inter-planar distances. In particular, the distance between the two neighboring BiO layers has significantly decreased in the modulation-free phase as compared to the Pb-free phase. We believe that this is a key point in understanding the widely observed reduction of the anisotropy in Bi-2212 by Pb-doping. The irreversibility line as well as the onset of the second magnetization peak in modulation-free (Bi,Pb)-2212 crystals were studied. Because of the strongly reduced value of the anisotropy, the 2D-3D crossover field value, H cr , is significantly higher in (Bi,Pb)-2212 crsystals than in Bi-2212 crystals. As a direct consequence of the structural modifications induced by the removal of the modulation, the nature of the inter-layer coupling changes from electromagnetic in modulated Bi-2212 to Josephson in modulation-free (Bi,Pb)-2212. Annealing the (Bi,Pb)-2212 crystals under oxygen reintroduced the structural modulation.

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“…These effects were completely unexpected. By now they have been widely observed [8,10,12,13,[20][21][22][23]. The source of these electronic disorder phenomena in cuprates is still unknown.…”

Section: Nanoscale Electronic Disorder In Dðð Rþmentioning

confidence: 99%

Spectroscopic imaging STM studies of high-TC superconductivity

Lee

Slezak

Davis

2005

Journal of Physics and Chemistry of Solids

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Observations of electronic inhomogeneity in heavily Pb-dopedBi2Sr2CaCu

Cited by 54 publications

References 23 publications

Quasiparticle density of states ofBi2Sr2CaCu2O8+δ
Vedeneev
¹
,
Maude
²

2005
Phys. Rev. B
22
0
8
0
View full text Add to dashboard Cite

Quasiparticle density of states ofBi2Sr2CaCu2O8+δ
Vedeneev
¹
,
Maude
²

2005
Phys. Rev. B
22
0
8
0
View full text Add to dashboard Cite

Structural origin of the low superconducting anisotropy of Bi1.7Pb0.4Sr2Ca0.9Cu2O8 crystals

Spectroscopic imaging STM studies of high-TC superconductivity

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Observations of electronic inhomogeneity in heavily Pb-dopedBi2Sr2CaCu

Cited by 54 publications

References 23 publications

Quasiparticle density of states ofBi2Sr2CaCu2O8+δVedeneev1, Maude2 2005Phys. Rev. B22080View full textAdd to dashboardCite

Quasiparticle density of states ofBi2Sr2CaCu2O8+δVedeneev1, Maude2 2005Phys. Rev. B22080View full textAdd to dashboardCite

Structural origin of the low superconducting anisotropy of Bi1.7Pb0.4Sr2Ca0.9Cu2O8 crystals

Spectroscopic imaging STM studies of high-TC superconductivity

Contact Info

Product

Resources

About

Quasiparticle density of states ofBi2Sr2CaCu2O8+δ
Vedeneev
¹
,
Maude
²

2005
Phys. Rev. B
22
0
8
0
View full text Add to dashboard Cite

Quasiparticle density of states ofBi2Sr2CaCu2O8+δ
Vedeneev
¹
,
Maude
²

2005
Phys. Rev. B
22
0
8
0
View full text Add to dashboard Cite