DocumentCode :
1351553
Title :
On the Residual Resistivity Ratio in 
Superconductors
Author :
Chauhan, Suchitra Rajput ; Chaudhary, Sujeet
Author_Institution :
Dept. of Phys., Indian Inst. of Technol. Delhi, New Delhi, India
Volume :
20
Issue :
1
fYear :
2010
Firstpage :
26
Lastpage :
32
Abstract :
It is found that there exist two different but related parameters that control the value of the residual resistivity ratio (RRR) in MgB2, namely, the stoichiometry of the starting powder and the synthesis parameters. The origin of the high RRR in the polycrystalline MgB2 samples has been attributed to the enhanced crystallinity of the samples due to higher Mg concentration in the starting composition. Scanning-electron-microscope images show the improved crystalline nature of the tape samples synthesized with the excess Mg in the starting powder mixture.
Keywords :
boron alloys; electrical resistivity; magnesium alloys; powder technology; scanning electron microscopy; stoichiometry; type II superconductors; MgB2; polycrystalline samples; powder; powder mixture; residual resistivity ratio; scanning electron microscopy; stoichiometry; synthesis parameters; $hbox{MgB}_{2}$
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2009.2035516
Filename :
5350709
Link To Document :
