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Corrosion and surface spectroscopies of high-temperature superconductors
Crucial spectroscopic high-temperature superconductor (HTS) information is based on surface methods, like scanning tunneling spectroscopy (STS) or angle-resolved photo-emission spectroscopy (ARPES). But, typic...
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Charge transfer via interfaces, especially of nanoscale materials
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Article
Tunnel channels, spectroscopy and imaging in STM
φ/?≈5.1/nmfor a tunnel with barrier height φ≈1 eV are given for surfaces covered by water, air or vacuum. Despite the n=1,2,3 intermediate states and their charging, imaging down to atomic resolution is achiev...
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Article
YBa2Cu3O7-δ single crystals revisited: Scanning probe data on very pure samples grown in BaZrO3 crucibles
Cu3O7-δ (YBCO) single crystals grown in BaZrO3 crucibles by scanning and friction force microscopy (SFM, FFM) as well as by scanning tunneling microscopy (STM) and angle resolved X-ray photo-electron spectroscopy...
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Article
Nucleation and growth of Ni-LIGA layers
The quality of a Ni-LIGA layer and its adhesion to TiO2 depend crucially on interface morphology and chemistry. The unique combination of ARXPS (angle resolved photo electron spectroscopy), STM (Scanning tunnel ...
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ARXPS studies of SiO2-SiC interfaces and oxidation of 6H SiC single crystal Si-(001) and C-(001) surfaces
The main puzzle in oxidation of hexagonal SiC is the slower rate of the Si-terminated surface as compared to the C-terminated surface, which is blamed on an unknown interface compound. ARXPS is a unique method...
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Article
Effect of the Weak Links on the Surface Resistance of YBa2Cu3Ox Bulk Material
Dc magnetic field, temperature, and magnetic history dependencies of the millimeter-wave surface resistance have been measured in high quality grain-aligned and in polycrystalline YBa2Cu3Ox bulk material. The mea...
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On Extrinsic Effects in the Surface Impedance of Cuprate Superconductors
Presently, the rf surface impedance Z of cuprate superconductors is still shrinking with material improvements, which is shown clearly by Z = Z1+Zres still dominated by extrinsic properties summarized in Zres. We...
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Surface Impedance and Granularity in Superconducting Cuprates
The rf residual surface resistance Rres is an important figure of merit for superconducting microwave devices and for establishing the homogeneity of superconducting surfaces. In granular superconductors not only...
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Model of Si–SiO2 interfaces based on ARXPS measurements
Angle-resolved x-ray photoelectron spectroscopy (ARXPS) results in a very detailed analysis of minor amounts (≥0.3 nm) of interface compounds and their spatial distribution. First experimental results on the S...
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On the oxidation and on the superconductivity of niobium
Most superconducting rf cavities consist on Nb and most Josephson tunnel junctions are Nb based. Due to the very small dissipation in these superconducting cavities and tunnel junctions quantitative and qualit...
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Dynamical enhanced electron emission and discharges at contaminated surfaces
Broad-area electrodes show electron emission already at electric field strengthsF≈107 V/m. This enhanced field emission (EFE) occurs only for contaminated surfaces. EFE is accompanied by photon emission and gas d...