APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

22 Jun 1998

Volume 72, Issue 25, pp. 3243-3383

Return to All Sections
back to top
RSS Feeds

High-resolution x-ray spectra measured using tantalum superconducting tunnel junctions

P. Verhoeve, N. Rando, A. Peacock, A. van Dordrecht, B. G. Taylor, and D. J. Goldie

Appl. Phys. Lett. 72, 3359 (1998); http://dx.doi.org/10.1063/1.121603 (3 pages) | Cited 18 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The spectral response of a 100×100 μm2 tantalum based superconducting tunnel junction to 5.9 keV x-ray photons from a 55Fe source has been studied. In full illumination the energy resolution for the Mn Kα line complex is 56 eV, dominated by spatial nonuniformity in the response of the detector. When illuminating selectively a 5–10 μm diam spot in the center of the detector, the energy resolution improves to 22 eV, corresponding to 15.7 eV for the individual Mn Kα1 and Mn Kα2 lines. This exceeds the predicted theoretical energy resolution of 7.3 eV for this type of device by only a factor of ∼2. © 1998 American Institute of Physics.
Show PACS
85.25.Qc Superconducting surface acoustic wave devices and other superconducting devices
07.85.Fv X- and γ-ray sources, mirrors, gratings, and detectors

Field-free core, current distribution, and alternating current losses in self fields for rectangular superconductor tapes

T. Fukunaga, R. Inada, and A. Oota

Appl. Phys. Lett. 72, 3362 (1998); http://dx.doi.org/10.1063/1.121604 (3 pages) | Cited 16 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A method is proposed to calculate the shape of field-free core, the current distribution, and accordingly the alternating current (ac) losses in self fields as a parameter of current amplitude I0 for straight superconductor tapes with the arbitrary sectional geometry. The validity for this is justified by showing that magnetic fields inside the field-free core are negligibly small and by checking that calculation results of ac losses for elliptic tapes agree with the prediction by the theory of Norris. The ac losses for rectangular tapes behave as a thin strip superconductor in high I0 values near critical current, while showing a gradual deviation from this behavior as I0 is lowered. A decrease in the aspect ratio of width to thickness in the rectangular tape makes the deviation more remarkable. © 1998 American Institute of Physics.
Show PACS
84.71.Mn Superconducting wires, fibers, and tapes
74.25.Sv Critical currents
74.20.-z Theories and models of superconducting state

Nondestructive investigation of microstructures and defects at a SrTiO3 bicrystal boundary

Q. D. Jiang, Z. J. Huang, A. Brazdeikis, M. Dezaneti, C. L. Chen, P. Jin, and C. W. Chu

Appl. Phys. Lett. 72, 3365 (1998); http://dx.doi.org/10.1063/1.121605 (3 pages) | Cited 5 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The effects of thermal annealing on the microstructure at the grain boundary of a 36.8° symmetric [100] tilt SrTiO3 bicrystal were studied. Scanning tunneling microscopy and atomic force microscopy were used for nondestructive observation of the boundary structures. Annealing the bicrystalline substrates at temperatures as low as 780 °C led to the formation of grooves at their boundaries. This provides direct evidence that the thickness depression of YBa2Cu3O7−δ films at the bicrystal boundaries originates from the underlying grooved substrates. Defects characterized as holes with diameters ranging from ∼ 30 nm to ∼ 200 nm were also observed. © 1998 American Institute of Physics.
Show PACS
68.35.Ct Interface structure and roughness
61.72.Mm Grain and twin boundaries
61.72.Cc Kinetics of defect formation and annealing
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close