25 research outputs found
Gaussian Tunneling Model of c-Axis Twist Josephson Junctions
We calculate the critical current density for c-axis Josephson
tunneling between identical high temperature superconductors twisted an angle
about the c-axis. We model the tunneling matrix element squared as a
Gaussian in the change of wavevector q parallel to the junction, . The
obtained for the s- and extended-s-wave order parameters (OP's) are consistent
with the BiSrCaCuO data of Li {\it et al.}, but only
for strongly incoherent tunneling, . A -wave OP
is always inconsistent with the data. In addition, we show that the apparent
conventional sum rule violation observed by Basov et al. might be
understandable in terms of incoherent c-axis tunneling, provided that the OP is
not -wave.Comment: 6 pages, 6 figure
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First Measurements Using the ALS Soft X-ray Fourier Transform Spectrometer
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Spatial structure determination of (sqrt 3 x sqrt 3)R30 degrees and (1.5 x 1.5) R18 degrees CO or Cu(111) Using Angle-resolved Photoemission extended fine structure
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Adsorption Site and Structure Determination of c(2x2) N2/Ni(100) using Angle-resolved Photoemission Extended Fine Structure
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Design and performance of a Soft X-ray Interferometer for Ultra-High Resolution Fourier Transform Spectroscopy
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Structural Determination of p2Mg(2x1)CO/Ni(110) With The Use of Angle-Resolved Photoemission Extended Fine Structure
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Investigation of the Effects of Phase Errors on High Resolution Fourier Transform Spectroscopy of Narrow Bandwidth Spectra in the 100-200 angstrom Region
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Angle-Resolved Photoemission Extended Fine Structure: Multiple Layers of Emitters and Multiple Initial States
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Toward a Soft X-Ray Fourier-Transform Spectrometer
The use of Fourier transform spectroscopy (FTS) in the soft x-ray region is advocated as a possible route to spectral resolution superior to that attainable with a grating system. A technical plan is described for applying FTS to the study of the absorption spectrum of helium in the region of double ionization around 60--80 eV. The proposed scheme includes a Mach-Zehnder interferometer deformed into a rhombus shape to provide grazing incidence reflections. The path difference between the interfering beams is to be tuned by translation of a table carrying four mirrors over a range {+-}1 cm which, in the absence of errors generating relative tilts of the wave fronts, would provide a resolving power equal to the number of waves of path difference: half a million at 65 eV, for example. The signal-to-noise ratio of the spectrum is analyzed and for operation on an Advanced Light Source bending magnet beam line should be about 330