Direct STM mapping of the superconducting energy gap in single crystal BI2SR2CACU2O8+x

Wolf, E. L.; Chang, A.; Rong, Zhao; Ivanchenko, Yu. M.; Lu, Farun

doi:10.1007/bf00724568

Cited by 30 publications

(11 citation statements)

References 28 publications

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“…Indeed, spatially resolved spectroscopy measurements have shown clear evidence for variations in 24 associated with structural inhomogeneity. [88,891 To delineate the intrinsic versus extrinsic features of the superconducting energy gap in the high-T, materials we have reported systematic measurements on carefully annealed BSCCO-2212 samples with r, values ranging from 79 to 92 K. The STM spectroscopy measurements exhibited values of 24 that were uniform over the sample surfaces (Fig. 20) region about U = 0 and pronounced conductance onsets at +(20-25) mV.…”

Section: The Superconducting Energy Gapmentioning

confidence: 97%

Understanding and Manipulating Inorganic Materials with Scanning Probe Microscopes

Lieber

Liu

Sheehan

1996

Angew. Chem. Int. Ed. Engl.

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Scanning probe microscopies, such as scanning tunneling microscopy and atomic force microscopy, are uniquely powerful tools for probing the microscopic properties of surfaces. If these microscopies are used to study low‐dimensional materials, from two‐dimensional solids such as graphite to zero‐dimensional nanostructures, it is possible to elucidate atomic‐scale structural and electronic properties characteristic of the bulk of a material and not simply the surface. By combining such measurements with chemical synthesis or direct manipulation it is further possible to elucidate relationships between composition, structure, and physical properties, thus promoting an understanding of the chemical basis of material properties. This article illustrates that the combination of scanning probe microscopies and chemical synthesis has advanced our understanding of charge density waves, high‐temperature superconductivity, and nanofabrication in low‐dimensional materials. This new approach to studying materials has directly contributed to our knowledge of how metal dopants interact with charge density waves and elucidated the local crystal chemistry of complex copper oxides, microscopic details of the superconducting states in materials with a high superconducting transition Ic, and new approaches to the fabrication of multi‐component nanostructures. Coupling scanning probe microscopy measurement and manipulation with chemical synthesis should provide an approach to understanding material properties and creating complex nanostructures in general.

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Section: The Superconducting Energy Gapmentioning

confidence: 97%

Understanding and Manipulating Inorganic Materials with Scanning Probe Microscopes

Lieber

Liu

Sheehan

1996

Angew. Chem. Int. Ed. Engl.

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“…Recently Wolf et al [1], using scanning tunneling microscopy and spectroscopy, directly observed superconducting Bi-O layers of Bi Sr CaCu O (BSCCO). They also reported evidence of fluctuations in superconductivity as their microscope moved across the surface, which they correlated with oxygen stoichiometry-suggesting that the superconductivity is better or worse, depending on whether the local surface contains excess oxygen.…”

Section: Evidence That Cuprate Planes Do Not Superconduct In Bsccomentioning

confidence: 99%

“…These results can be interpreted in either of two ways: (i) the primary superconductivity is in the cuprate planes (CuO ), and induces superconductivity in the Bi-O layers by the proximity effect, which is influenced by oxygen stoichiometry [1]; or (ii) the primary superconductivity comes from the Bi-O layers themselves, and the presence or absence of oxygen at a particular spot on the surface influences that superconductivity [2].…”

Section: Evidence That Cuprate Planes Do Not Superconduct In Bsccomentioning

confidence: 99%

Evidence for superconductivity in the Bi-O layers and not in the cuprate planes of Bi2Sr2CaCu2O8

Blackstead

Dow

1996

Superlattices and Microstructures

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“…Wolf et al [9] have measured simultaneously STM images and the dI t /dVt (s, x, y) maps on BSCCO at 4.2 K. They interpret the superconducting DOS structures observed on the uppermost BiO layer as a superconductivity induced in BiO by proximity effect from deeper CuO planes.…”

Section: Introductionmentioning

confidence: 99%

Scanning Tunneling Spectroscopy Sensitive to Layer Structure of BSCCO

Aleszkiewicz

Raułuszkiewicz

1997

Acta Phys. Pol. A

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Scanning tunneling microscopy images and scanning tunneling spectroscopy characteristics were measured at 4.2 K in liquid helium bath on the cleaved in air α-b surface of Bi2Sr2CaCu2O8 (BSCCO-2212). Electronic densities of states and superconductivity parameters 6 and r evaluated from dl/dV characteristics depend on tip-sample distance s: with shortening of the distance s superconducting gap structure becomes more distinct, i.e. 6 increases and F decreases. We explain this phenomenon as a non-vacuum tunneling, where for longer s tunneling electrons reach only the surface contamination layer on non-metallic BiO top-surface layer, whereas for shorter s tunneling electrons penetrate also deeper lying CuO layers reflecting their superconducting properties. The dependence of a on s is evaluated. This result allows to understand better the non-vacuum scanning tunneling microscopy imaging: by adjusting properly the tip-sample distance one can select suitable local density of states contributing dominantly to the scanning tunneling microscopy images taken on BSCCO.

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Direct STM mapping of the superconducting energy gap in single crystal BI2SR2CACU2O8+x

Cited by 30 publications

References 28 publications

Understanding and Manipulating Inorganic Materials with Scanning Probe Microscopes

Understanding and Manipulating Inorganic Materials with Scanning Probe Microscopes

Evidence for superconductivity in the Bi-O layers and not in the cuprate planes of Bi2Sr2CaCu2O8

Scanning Tunneling Spectroscopy Sensitive to Layer Structure of BSCCO

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