Surveying the Surface Coordination Chemistry of a Superconductor: Spontaneous Adsorption of Monolayer Films of Redox-Active "Ligands" on YBa2Cu3O7-.delta.

Chen, Kaimin; Mirkin, Chad A.; Lo, Rung Kuang; Zhao, Jianai; McDevitt, John T.

doi:10.1021/ja00128a034

Cited by 37 publications

(47 citation statements)

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“…This method results in the formation of a densely packed monolayer of 1,12 diaminododecane on the YBCO surface. Although these particular films have not been extensively characterized, this general type of organic monolayer͞YBCO structure has been extensively studied and characterized [20,21]. Notably, this is the first use of such structures for preparing tunnel junctions on a cuprate superconductor.…”

mentioning

confidence: 99%

Observation of Surface-Induced Broken Time-Reversal Symmetry inYBa2Cu3O7

et al. 1997

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Data from ab-oriented YBa 2 Cu 3 O 7 ͞I͞Cu tunnel junctions are presented. Self-assembled monolayers form the insulating tunnel barrier, I. The YBa 2 Cu 3 O 7 features in the tunneling conductance match those of low-leakage ab-oriented YBa 2 Cu 3 O 7 ͞Pb junctions. Results show that the zero-bias conductance peak is an Andreev bound state (ABS) of a d-wave order parameter. In zero magnetic field, the ABS splits below ϳ7 K, consistent with the presence of a subdominant order parameter at the surface. An applied magnetic field induces further splitting that grows nonlinearly with increasing field.[S0031-9007 (97)03529-1] PACS numbers: 74.50. + r, 74.72.Bk

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confidence: 99%

Observation of Surface-Induced Broken Time-Reversal Symmetry inYBa2Cu3O7

et al. 1997

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“…In one of the first studies on the chemical modification of HTSC material surfaces, 232 various ferrocene derivatives containing aminoalkyl, aminoaryl, thiol, phosphino, and hydroxymethyl functional groups were adsorbed at room temperature onto the surfaces of the YBa 2 Cu 3 O 77x ceramic and thin film from a solution in acetonitrile. The solution concentration of the reagents was 10 73 mol litre 71 .…”

Section: Adsorbed Compoundmentioning

confidence: 99%

The chemical and adsorption effects of foreign molecules on the properties of high-temperature superconductors

Макаршин¹,

Andreev²,

Parmon³

2000

Russ. Chem. Rev.

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“…Preparation of the dodecylamine (Aldrich) monolayer on copper followed the procedures described in the papers by Chen et al 8 and McDevitt et al 9 The C 10 hydroxamic acid was graciously supplied by the group of G. Whitesides, Harvard University, Cambridge, MA. Procedures for the preparation of hydroxamic acid layers on silver are described in a paper by this group.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The program outputs an ASCII file containing four columns: overlayer thickness in nm, the Ebel Model result for I C1s /I CKVV for that layer thickness, the substrate effect correction factor 1 C I e C /I x C (the ratio of Eqn (8) to Eqn (3)) and the I C1s /I CKVV ratio determined from the Substrate Effect Model. Within this calculation, numerous tabulated values and relations were employed, as discussed in the text.…”

Section: Appendixmentioning

confidence: 99%

Substrate photoelectron enhancement of carbonaceous overlayer Auger emission: effect of the substrate on carbon overlayer thickness determination in XPS

Brizzolara

Beard

1999

Surf. Interface Anal.

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The Ebel Model, which characterizes a sample consisting of a thin carbonaceous overlayer on a substrate of a different material, provides a relationship between the carbon 1s and Auger peak intensities and the overlayer thickness. In this paper, Ebel model predictions for six substrate materials (silicon, aluminum, titanium, copper, silver and gold) are compared with experimental data from samples prepared using self‐assembled monolayer and Langmuir–Blodgett techniques. Although the agreement between the experimentally measured carbon 1s/carbon Auger ratio and the Ebel Model was very good for silicon and aluminum and good for titanium, copper and silver, the experimentally determined ratio was consistently lower than that predicted by the Ebel Model for the gold substrate. For a 1.3 nm thick carbon layer on gold, the discrepancy between the measurement and the Ebel Model was 26%. We therefore modified the Ebel Model to include the effects of photoionization of carbon atoms in the overlayer by substrate photoelectrons. We refer to this as the Substrate Effect Model. Agreement between the Substrate Effect Model and the experimental data is very good for all six substrates examined. Because the Substrate Effect Model gives an accurate relationship between the carbon peak intensities and overlayer thickness, it can be used to determine an unknown overlayer thickness and to improve the accuracy of XPS quantitative analysis by accounting for the presence of the ubiquitous adventitious carbon layer. To this end, Substrate Effect Model results are presented for 40 substrate elements of technological interest and for overlayer thicknesses of 1,2 and 5 nm. Copyright © 1999 John Wiley & Sons, Ltd.

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Surveying the Surface Coordination Chemistry of a Superconductor: Spontaneous Adsorption of Monolayer Films of Redox-Active "Ligands" on YBa2Cu3O7-.delta.

Cited by 37 publications

References 0 publications

Observation of Surface-Induced Broken Time-Reversal Symmetry inYBa2Cu3O7

Observation of Surface-Induced Broken Time-Reversal Symmetry inYBa2Cu3O7

The chemical and adsorption effects of foreign molecules on the properties of high-temperature superconductors

Substrate photoelectron enhancement of carbonaceous overlayer Auger emission: effect of the substrate on carbon overlayer thickness determination in XPS

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