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Phys. Rev. Lett. 92, 217003 (2004) [4 pages]

Systematic Effects of Carbon Doping on the Superconducting Properties of Mg(B1-xCx)2

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R. H. T. Wilke1,2, S. L. Bud’ko1, P. C. Canfield1,2, and D. K. Finnemore1,2
1Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Raymond J. Suplinskas
Specialty Materials, Inc., 1449 Middlesex Street, Lowell, Massachusetts 01851, USA

S. T. Hannahs
National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, USA

Received 9 December 2003; published 27 May 2004

The upper critical field, Hc2, 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 Hc2(T=0) rises by about 5   T/% C. This means that 3.8% C substitution will depress Tc from 39.2 to 36.2   K and raise Hc2(T=0) from 16.0 to 32.5   T. These rises in Hc2 are accompanied by a rise in resistivity at 40   K from about 0.5 to about 10   μΩ cm.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.217003
DOI:
10.1103/PhysRevLett.92.217003
PACS:
74.25.Bt, 74.25.Fy, 74.25.Ha
 
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