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  Superconducting gap structure and pinning in disordered MgB2 films

Bugoslavsky, Y., Miyoshi, Y., Perkins, G. K., Caplin, A. D., Cohen, L. F., Zhai, H. Y., et al. (2004). Superconducting gap structure and pinning in disordered MgB2 films. Superconductor Science and Technology, 17(5), S350-S354.

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 Creators:
Bugoslavsky, Y., Author
Miyoshi, Y., Author
Perkins, G. K., Author
Caplin, A. D., Author
Cohen, L. F., Author
Zhai, H. Y., Author
Christen, H. M., Author
Pogrebnyakov, A. V., Author
Xi, X. X., Author
Dolgov, O. V.1, 2, 3, Author           
Affiliations:
1Former Departments, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370502              
2Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370480              
3Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370481              

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 Abstract: We have performed a comparative study of two thin films of magnesium
diboride (MgB2) grown by different techniques. The critical current
density at different temperatures and magnetic fields was evaluated
from magnetization curves, the structure of the superconducting order
parameter was obtained from point-contact spectroscopy and the
scattering rates were evaluated by fitting the temperature dependent
normal-state resistivity to the two-band model. The films have similar
critical temperatures close to 39 K, but the upper critical fields were
different by a factor of 2 (5.2 and 2.5 T at 20 K). We have found that
the film with higher H-c2 also had stronger scattering in the sigma
band and a smaller value of the superconducting gap in this band. As
the scattering in the a band is primarily due to the defects in the
boron plane, our results are consistent with the assumption that
disordering the boron planes leads to enhanced H-c2 and better pinning
properties in a magnetic field.

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Language(s): eng - English
 Dates: 2004
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 192952
ISI: 000221792700053
 Degree: -

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Title: Superconductor Science and Technology
Source Genre: Journal
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Pages: - Volume / Issue: 17 (5) Sequence Number: - Start / End Page: S350 - S354 Identifier: ISSN: 0953-2048