Systematic effects of carbon doping on the superconducting properties of Mg(B1-xCx)(2)
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2004-05-28
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American Physical Society
Abstract
The upper critical field, H-c2, of Mg(B1-xCx)(2) has been measured in order to probe the maximum magnetic field range for superconductivity that can be attained by C doping. Carbon doped MgB2 filaments were prepared, and for carbon levels below 4% the transition temperatures are depressed by about 1 K/% C and H-c2(T=0) rises by about 5 T/% C. This means that 3.8% C substitution will depress T-c from 39.2 to 36.2 K and raise H-c2(T=0) from 16.0 to 32.5 T. These rises in H-c2 are accompanied by a rise in resistivity at 40 K from about 0.5 to about 10 muOmega cm.
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This article is published as Wilke, R. H. T., S. L. Bud’ko, P. C. Canfield, D. K. Finnemore, Raymond J. Suplinskas, and S. T. Hannahs. "Systematic effects of carbon doping on the superconducting properties of Mg (B 1− x C x) 2." Physical Review Letters 92, no. 21 (2004): 217003.
DOI: 10.1103/PhysRevLett.92.217003.
Copyright 2004 American Physical Society.
Posted with permission.